feat: import Chinese-localized Buzz source snapshot

Signed-off-by: cls_宁波本机 <908705107@qq.com>

mobile/.env.json.example

@@ -0,0 +1,4 @@
+{
+  "BUZZ_RELAY_URL": "http://localhost:3000",
+  "BUZZ_DEV_PUBKEY": "<your-hex-pubkey-here>"
+}

mobile/.gitignore

@@ -0,0 +1,48 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.build/
+.buildlog/
+.history
+.svn/
+.swiftpm/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+/coverage/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release
+
+# Local environment config (contains keys)
+.env.json

mobile/.metadata

@@ -0,0 +1,33 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "db50e20168db8fee486b9abf32fc912de3bc5b6a"
+  channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: db50e20168db8fee486b9abf32fc912de3bc5b6a
+      base_revision: db50e20168db8fee486b9abf32fc912de3bc5b6a
+    - platform: android
+      create_revision: db50e20168db8fee486b9abf32fc912de3bc5b6a
+      base_revision: db50e20168db8fee486b9abf32fc912de3bc5b6a
+    - platform: ios
+      create_revision: db50e20168db8fee486b9abf32fc912de3bc5b6a
+      base_revision: db50e20168db8fee486b9abf32fc912de3bc5b6a
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

mobile/CHANGELOG.md

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+# Changelog
+
+## mobile-v0.4.11
+
+- fix(mobile): stop media fetch stampede — stable cache keys, bounded decode, 429 cooldown ([#2219](https://github.com/block/buzz/pull/2219)) ([`591bbbfa7`](https://github.com/block/buzz/commit/591bbbfa7e5931318a226555d6bf921ba50d97c2))
+
+
+## mobile-v0.4.9
+
+- fix(mobile): sanitize Android image uploads ([#2188](https://github.com/block/buzz/pull/2188)) ([`ee21da90b`](https://github.com/block/buzz/commit/ee21da90bd6b1da6bfaaf22ba00749398aaa9640))
+- chore(release): release Buzz Mobile version 0.4.8 ([#2187](https://github.com/block/buzz/pull/2187)) ([`fb8c90cf5`](https://github.com/block/buzz/commit/fb8c90cf597960e48fe55a9baceb8a5a08112ccc))
+- fix(mobile): image upload fails due to unstripped metadata ([#2185](https://github.com/block/buzz/pull/2185)) ([`37f15b200`](https://github.com/block/buzz/commit/37f15b20019169363b697aee41c99573b7bc3f24))
+- chore(deps): update all non-major dependencies ([#2152](https://github.com/block/buzz/pull/2152)) ([`6da407742`](https://github.com/block/buzz/commit/6da407742a09ee531c53a99ca5d2d314f0b38aef))
+
+
+## mobile-v0.4.8
+
+- fix(mobile): image upload fails due to unstripped metadata ([#2185](https://github.com/block/buzz/pull/2185)) ([`37f15b200`](https://github.com/block/buzz/commit/37f15b20019169363b697aee41c99573b7bc3f24))
+- chore(deps): update all non-major dependencies ([#2152](https://github.com/block/buzz/pull/2152)) ([`6da407742`](https://github.com/block/buzz/commit/6da407742a09ee531c53a99ca5d2d314f0b38aef))
+
+
+## mobile-v0.4.7
+
+- fix(ui): relabel agent owner attribution from "owned by" to "managed by" ([#2133](https://github.com/block/buzz/pull/2133)) ([`a1e977cd1`](https://github.com/block/buzz/commit/a1e977cd1bda3f5421533b47f12c38f4a336224e))
+- chore(release): release Buzz Mobile version 0.4.6-rc.1 ([#2049](https://github.com/block/buzz/pull/2049)) ([`3aba3a531`](https://github.com/block/buzz/commit/3aba3a5316ae8bb1aed518e01e68c3e3a2166a46))
+- Strip media metadata on clients and reject it at the relay ([#2006](https://github.com/block/buzz/pull/2006)) ([`5cfd69cb0`](https://github.com/block/buzz/commit/5cfd69cb0cf1dc63d718454defe3b8a8aaf5f15b))
+
+
+## mobile-v0.4.6-rc.1
+
+- Strip media metadata on clients and reject it at the relay ([#2006](https://github.com/block/buzz/pull/2006)) ([`5cfd69cb`](https://github.com/block/buzz/commit/5cfd69cb0cf1dc63d718454defe3b8a8aaf5f15b))
+
+
+## mobile-v0.4.5
+
+- fix(mobile): support open pairing relays ([#1939](https://github.com/block/buzz/pull/1939)) ([`a0081944`](https://github.com/block/buzz/commit/a0081944edbb3d33a2bcee0b4890ae5ef8ad4966))
+- fix(mobile): replace pairing placeholder with Buzz icon ([#1952](https://github.com/block/buzz/pull/1952)) ([`7eea924f`](https://github.com/block/buzz/commit/7eea924f3d7cf9ee816ae5f206c88762274fd7c6))
+- feat(media): require auth for relay media reads ([#1926](https://github.com/block/buzz/pull/1926)) ([`f3087628`](https://github.com/block/buzz/commit/f3087628524951de91028c9d263bcd0d0a727fab))
+
+
+## mobile-v0.4.4
+
+- fix(mobile): surface non-member people and owned agents in @mention autocomplete ([#1877](https://github.com/block/buzz/pull/1877)) ([`54f41659`](https://github.com/block/buzz/commit/54f4165942ab5b3e2cf1fa1b47bbb907587cd5f4))
+- fix(mobile): open profile sheet when tapping @mentions ([#1876](https://github.com/block/buzz/pull/1876)) ([`7e009a89`](https://github.com/block/buzz/commit/7e009a893748eb660efd6d51d78f172cc913e3da))
+- fix(mobile): handle buzz:// links ([#1826](https://github.com/block/buzz/pull/1826)) ([`37f65c08`](https://github.com/block/buzz/commit/37f65c08dc4fc357e54283b19d6019b18cd2b00e))
+
+
+## mobile-v0.4.3
+
+- fix(mobile): fix agent avatars on mobile ([#1837](https://github.com/block/buzz/pull/1837)) ([`7b6e1265`](https://github.com/block/buzz/commit/7b6e12657d69316614726065db69cc418750a973))
+- refactor(clients): standardize product naming on community ([#1858](https://github.com/block/buzz/pull/1858)) ([`3e76481a`](https://github.com/block/buzz/commit/3e76481a149bb3de459298cc989505c470c2372c))
+- fix(mobile): mirror app bar title padding when actions are empty ([#1832](https://github.com/block/buzz/pull/1832)) ([`f3599f2c`](https://github.com/block/buzz/commit/f3599f2cd4509e9120d8466d0ff2f79ee9dc5803))
+- docs(mobile): backfill mobile changelog ([#1835](https://github.com/block/buzz/pull/1835)) ([`259a1724`](https://github.com/block/buzz/commit/259a1724d31787a8a110e2689b8a813b22d0a382))
+- BOT-1247 Configure Android Play identity and signing ([#1829](https://github.com/block/buzz/pull/1829)) ([`f1706e23`](https://github.com/block/buzz/commit/f1706e23f79020812ef097c3167102a8ee3bfc9a))
+
+
+## mobile-v0.4.2
+
+- fix(mobile): add mentioned agents to channels ([#1696](https://github.com/block/buzz/pull/1696)) ([`3112e59f`](https://github.com/block/buzz/commit/3112e59fd8141818712b04d55919145f0516846b))
+- Resynchronize the mobile version with the canonical release line after an accidental desktop-derived 0.4.1 version ([#1833](https://github.com/block/buzz/pull/1833)) ([`ffa2de0f`](https://github.com/block/buzz/commit/ffa2de0fba94438397429da7bf60e774285c7ddd))
+
+
+## mobile-v0.3.33
+
+- fix(mobile): align Android AGP/Gradle/Kotlin with Flutter 3.41.7 (unbreak Android build) ([#1775](https://github.com/block/buzz/pull/1775)) ([`bc14052d`](https://github.com/block/buzz/commit/bc14052d3941ffcc4b54541f65b24b68ce8f215b))
+- Fix mobile relay reconnect lifecycle ([#1772](https://github.com/block/buzz/pull/1772)) ([`dbe7fb85`](https://github.com/block/buzz/commit/dbe7fb853486fe33d9df2660b29dee4574007cd1))
+- Serialize managed agent PATH tests ([#1777](https://github.com/block/buzz/pull/1777)) ([`1fc7488e`](https://github.com/block/buzz/commit/1fc7488ea58accf8bd96afe94cd93ee54174df00))
+- Fix oversized mobile Manage channel sheet ([#1774](https://github.com/block/buzz/pull/1774)) ([`81b55c9f`](https://github.com/block/buzz/commit/81b55c9f3eb147cf2b5753232ff75df6e51431f2))
+- fix(mobile): highlight full multi-word mentions ([#1762](https://github.com/block/buzz/pull/1762)) ([`92bb959e`](https://github.com/block/buzz/commit/92bb959ee1580ed05a45b80af599b53d78f611bb))
+- [BOT-1264] fix(mobile): #channel tags not tappable ([#1695](https://github.com/block/buzz/pull/1695)) ([`2687a2a1`](https://github.com/block/buzz/commit/2687a2a185a01bfb08478267587c08378d60136d))
+
+
+## mobile-v0.3.32
+
+- Restrict the iOS app to iPhone ([#1735](https://github.com/block/buzz/pull/1735)) ([`215f5218`](https://github.com/block/buzz/commit/215f521880b29d421221b371b5a5818fcdaf4dea))
+
+
+## mobile-v0.3.31
+
+- This release only resynchronized the pre-1.0 mobile version after an accidental 1.0.0 internal build ([#1724](https://github.com/block/buzz/pull/1724)) ([`bdb3e698`](https://github.com/block/buzz/commit/bdb3e6989988c2721e24ea37236edd60038eca50))

mobile/README.md

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+# Buzz Mobile
+
+Flutter mobile client for Buzz.
+
+## Setup
+
+```bash
+cd mobile
+flutter pub get
+```
+
+## Run
+
+```bash
+# From repo root (recommended — starts Docker, relay, and simulator):
+just mobile-dev
+
+# Direct (requires services and relay already running):
+cd mobile && flutter run
+```
+
+### Worktree-aware debug identity
+
+Debug builds produced from a git worktree get a unique app identifier keyed
+to the **worktree directory name** (`com.buzz.buzzMobile.<slug>` on iOS,
+`xyz.block.buzz.mobile.<slug>` on Android) plus a display-only branch label
+in the app name (`Buzz (my-branch)`, or a short SHA when the worktree is
+detached). Because the identifier follows the directory rather than the
+branch, one worktree keeps exactly one installed app — and its login state —
+across branch switches, and builds from multiple worktrees install side by
+side, mirroring the desktop dev experience. Release and profile builds
+always keep the production identity and name.
+
+`just mobile-dev` and `just mobile-build-android` apply this automatically by
+running `scripts/mobile-worktree-overrides.sh`, which writes two gitignored
+files:
+
+- `mobile/ios/Flutter/WorktreeOverrides.xcconfig` (included by Debug builds
+  only; a developer's `AppOverrides.xcconfig` is included after it, so
+  app-specific overrides like a personal `BUNDLE_IDENTIFIER` for device
+  signing always win)
+- `mobile/android/worktree.properties` (read by the debug build type only)
+
+For direct Xcode / Android Studio / `flutter run` development, run
+`./scripts/mobile-worktree-overrides.sh` from the repo root once per branch
+switch to refresh the display label (the install identity never changes);
+the persisted files are then picked up by any subsequent build. In the main
+checkout the script is a no-op that removes stale override files, restoring
+the plain `Buzz` identity.
+
+To remove leftover worktree-suffixed installs from booted iOS simulators and
+connected Android emulators, run `just mobile-clean` (add `--dry-run` via
+`./scripts/mobile-worktree-clean.sh --dry-run` to preview). Production
+installs are never touched.
+
+## Checks
+
+```bash
+dart format --output=none --set-exit-if-changed .
+flutter analyze
+flutter test
+```
+
+Or from the repo root: `just mobile-check` and `just mobile-test`.
+
+## Android release signing
+
+Android release builds fail unless all upload-key inputs are supplied through the
+environment:
+
+- `BUZZ_ANDROID_UPLOAD_KEYSTORE_PATH`: path to a CI-vended keystore file
+- `BUZZ_ANDROID_UPLOAD_KEYSTORE_PASSWORD`
+- `BUZZ_ANDROID_UPLOAD_KEY_ALIAS`
+- `BUZZ_ANDROID_UPLOAD_KEY_PASSWORD`
+
+The keystore path must be absolute, and the keystore must remain outside the
+repository. Development and debug builds do not require these variables.
+
+Release pipelines that sign through the central APK Signer service instead of
+a local upload keystore must set `BUZZ_ANDROID_RELEASE_SIGNING=external`. That
+mode produces an unsigned release bundle and refuses to run if any
+`BUZZ_ANDROID_UPLOAD_*` value is also set.
+
+## Architecture
+
+```
+lib/
+├── main.dart              # Entry point, Riverpod bootstrap
+├── app.dart               # MaterialApp with theme
+├── shared/
+│   └── theme/             # Catppuccin light/dark, spacing tokens, extensions
+└── features/
+    └── home/              # Placeholder home surface
+```
+
+- **State management:** Riverpod + Hooks (`HookConsumerWidget`)
+- **Theme:** Catppuccin Latte (light) / Macchiato (dark) — matches desktop
+- **Spacing:** `Grid` tokens for consistent spacing
+- **Linting:** `flutter_lints` + `riverpod_lint` via `custom_lint`
+- **Feature isolation:** No cross-feature imports except `shared/`

mobile/analysis_options.yaml

@@ -0,0 +1,11 @@
+include: package:flutter_lints/flutter.yaml
+
+analyzer:
+  plugins:
+    - custom_lint
+  errors:
+    invalid_use_of_visible_for_overriding_member: ignore
+
+linter:
+  rules:
+    prefer_single_quotes: true

mobile/android/.gitignore

@@ -0,0 +1,15 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+.cxx/
+/worktree.properties
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/to/reference-keystore
+key.properties
+**/*.keystore
+**/*.jks

mobile/android/app/build.gradle.kts

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+import java.util.Properties
+
+plugins {
+    id("com.android.application")
+    id("kotlin-android")
+    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
+    id("dev.flutter.flutter-gradle-plugin")
+}
+
+val uploadKeystorePath = providers.environmentVariable("BUZZ_ANDROID_UPLOAD_KEYSTORE_PATH").orNull
+val uploadKeystorePassword = providers.environmentVariable("BUZZ_ANDROID_UPLOAD_KEYSTORE_PASSWORD").orNull
+val uploadKeyAlias = providers.environmentVariable("BUZZ_ANDROID_UPLOAD_KEY_ALIAS").orNull
+val uploadKeyPassword = providers.environmentVariable("BUZZ_ANDROID_UPLOAD_KEY_PASSWORD").orNull
+val uploadSigningValues =
+    mapOf(
+        "BUZZ_ANDROID_UPLOAD_KEYSTORE_PATH" to uploadKeystorePath,
+        "BUZZ_ANDROID_UPLOAD_KEYSTORE_PASSWORD" to uploadKeystorePassword,
+        "BUZZ_ANDROID_UPLOAD_KEY_ALIAS" to uploadKeyAlias,
+        "BUZZ_ANDROID_UPLOAD_KEY_PASSWORD" to uploadKeyPassword,
+    )
+val missingUploadSigningValues = uploadSigningValues.filterValues { it.isNullOrBlank() }.keys
+val hasUploadSigning = missingUploadSigningValues.isEmpty()
+
+// Worktree-aware debug identity (gitignored, written by
+// scripts/mobile-worktree-overrides.sh): debug builds from a git worktree get a
+// branch-labelled app name and a unique applicationId suffix so builds from
+// multiple worktrees install side by side. Release builds never read this.
+val worktreePropsFile = rootProject.file("worktree.properties")
+val worktreeProps =
+    Properties().apply {
+        if (worktreePropsFile.isFile) worktreePropsFile.inputStream().use { load(it) }
+    }
+val worktreeLabel = worktreeProps.getProperty("label")?.takeIf { it.isNotBlank() }
+if (worktreeLabel != null && !worktreeLabel.matches(Regex("""[A-Za-z0-9._-]+"""))) {
+    throw GradleException(
+        "worktree.properties label must match [A-Za-z0-9._-]+ (safe for string " +
+            "resources), got: " + worktreeLabel,
+    )
+}
+val worktreeIdSuffix =
+    worktreeProps.getProperty("applicationIdSuffix")?.takeIf { it.isNotBlank() }
+if (worktreeIdSuffix != null && !worktreeIdSuffix.matches(Regex("""\.[a-z][a-z0-9_]*"""))) {
+    throw GradleException(
+        "worktree.properties applicationIdSuffix must match \\.[a-z][a-z0-9_]*, got: " +
+            worktreeIdSuffix,
+    )
+}
+
+// Release signing modes:
+//   - "upload-keystore" (default): sign with the CI-vended upload keystore;
+//     release builds fail loudly when any credential is missing.
+//   - "external": deliberately produce an UNSIGNED release bundle for a
+//     pipeline that signs through the central APK Signer service (Cashkite,
+//     BOT-1234). No keystore material may be present in this mode.
+val releaseSigningMode =
+    providers.environmentVariable("BUZZ_ANDROID_RELEASE_SIGNING").orNull ?: "upload-keystore"
+val externalReleaseSigning = releaseSigningMode == "external"
+if (releaseSigningMode !in setOf("upload-keystore", "external")) {
+    throw GradleException(
+        "BUZZ_ANDROID_RELEASE_SIGNING must be \"upload-keystore\" or \"external\", got: " +
+            releaseSigningMode,
+    )
+}
+if (externalReleaseSigning && uploadSigningValues.values.any { !it.isNullOrBlank() }) {
+    throw GradleException(
+        "BUZZ_ANDROID_RELEASE_SIGNING=external must not be combined with " +
+            "BUZZ_ANDROID_UPLOAD_* credentials; unset one of them.",
+    )
+}
+
+android {
+    namespace = "xyz.block.buzz.mobile"
+    compileSdk = flutter.compileSdkVersion
+    ndkVersion = flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_17.toString()
+    }
+
+    defaultConfig {
+        applicationId = "xyz.block.buzz.mobile"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://flutter.dev/to/review-gradle-config.
+        minSdk = flutter.minSdkVersion
+        targetSdk = flutter.targetSdkVersion
+        versionCode = flutter.versionCode
+        versionName = flutter.versionName
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        resValue("string", "app_name", "Buzz")
+    }
+
+    signingConfigs {
+        if (hasUploadSigning) {
+            create("upload") {
+                storeFile = file(requireNotNull(uploadKeystorePath))
+                storePassword = uploadKeystorePassword
+                keyAlias = uploadKeyAlias
+                keyPassword = uploadKeyPassword
+            }
+        }
+    }
+
+    buildTypes {
+        debug {
+            // Only debug builds take the worktree identity; release/profile
+            // keep the production applicationId and label.
+            if (worktreeIdSuffix != null) {
+                applicationIdSuffix = worktreeIdSuffix
+            }
+            if (worktreeLabel != null) {
+                resValue("string", "app_name", "Buzz ($worktreeLabel)")
+            }
+        }
+        release {
+            if (hasUploadSigning) {
+                signingConfig = signingConfigs.getByName("upload")
+            }
+        }
+    }
+}
+
+dependencies {
+    testImplementation(kotlin("test"))
+
+    androidTestImplementation(kotlin("test"))
+    androidTestImplementation("androidx.test.ext:junit:1.3.0")
+    androidTestImplementation("androidx.test:runner:1.7.0")
+}
+
+gradle.taskGraph.whenReady {
+    val buildsRelease = allTasks.any { task ->
+        task.project == project && task.name in setOf("assembleRelease", "bundleRelease")
+    }
+    if (buildsRelease && externalReleaseSigning) {
+        // External signing: the unsigned bundle goes to the central APK
+        // Signer. All keystore checks are intentionally skipped; the
+        // guard above already rejected any BUZZ_ANDROID_UPLOAD_* values.
+        return@whenReady
+    }
+    if (buildsRelease && !hasUploadSigning) {
+        throw GradleException(
+            "Release builds require Android upload signing credentials. Missing: " +
+                missingUploadSigningValues.sorted().joinToString(", ") +
+                ". For central APK Signer pipelines set BUZZ_ANDROID_RELEASE_SIGNING=external.",
+        )
+    }
+    if (buildsRelease) {
+        val configuredKeystore = File(requireNotNull(uploadKeystorePath))
+        if (!configuredKeystore.isAbsolute) {
+            throw GradleException(
+                "BUZZ_ANDROID_UPLOAD_KEYSTORE_PATH must be absolute: $configuredKeystore",
+            )
+        }
+        val keystore = file(configuredKeystore)
+        val repositoryRoot = rootProject.projectDir.parentFile.parentFile.canonicalFile
+        if (keystore.canonicalFile.toPath().startsWith(repositoryRoot.toPath())) {
+            throw GradleException(
+                "BUZZ_ANDROID_UPLOAD_KEYSTORE_PATH must be outside the repository: $keystore",
+            )
+        }
+        if (!keystore.isFile || !keystore.canRead()) {
+            throw GradleException(
+                "BUZZ_ANDROID_UPLOAD_KEYSTORE_PATH is not a readable file: $keystore",
+            )
+        }
+    }
+}
+
+flutter {
+    source = "../.."
+}

mobile/android/app/src/androidTest/kotlin/xyz/block/buzz/mobile/AndroidImageProcessorTest.kt

@@ -0,0 +1,188 @@
+package xyz.block.buzz.mobile
+
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.graphics.Color
+import android.os.Build
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import org.junit.Test
+import org.junit.runner.RunWith
+import kotlin.math.abs
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+import kotlin.test.assertTrue
+
+@RunWith(AndroidJUnit4::class)
+class AndroidImageProcessorTest {
+    companion object {
+        private val ALLOWED_PNG_CHUNKS = setOf(
+            "IHDR", "PLTE", "IDAT", "IEND", "cHRM", "gAMA", "sBIT", "sRGB", "bKGD", "hIST", "tRNS", "sPLT",
+            "acTL", "fcTL", "fdAT",
+        )
+    }
+
+    @Test
+    fun supportedApiCanProcessImagesWithoutNewerPlatformApis() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) return
+
+        val sourceBytes = fixtureBytes("bitmap-srgb.png")
+        val processed = assertNotNull(AndroidImageProcessor.decodeSrgbBitmap(sourceBytes))
+        assertEquals(Bitmap.Config.ARGB_8888, processed.config)
+
+        val scrubbed = assertNotNull(
+            AndroidImageProcessor.encodeAndScrub(processed, Bitmap.CompressFormat.PNG),
+        )
+        val chunkTypes = pngChunkTypes(scrubbed)
+        assertEquals("IHDR", chunkTypes.first())
+        assertEquals("IEND", chunkTypes.last())
+        assertTrue(chunkTypes.all { it in ALLOWED_PNG_CHUNKS })
+        assertPngPixelsPreserved(sourceBytes, scrubbed)
+    }
+
+    @Test
+    fun transparentPngPixelsSurviveSrgbProcessing() {
+        val sourceBytes = fixtureBytes("bitmap-srgb.png")
+        val source = assertNotNull(BitmapFactory.decodeByteArray(sourceBytes, 0, sourceBytes.size))
+        val processed = assertNotNull(AndroidImageProcessor.decodeSrgbBitmap(sourceBytes))
+        assertTrue(processed.hasAlpha())
+
+        val scrubbed = assertNotNull(
+            AndroidImageProcessor.encodeAndScrub(processed, Bitmap.CompressFormat.PNG),
+        )
+        assertPngPixelsPreserved(sourceBytes, scrubbed)
+        assertEquals(128, Color.alpha(source.getPixel(0, 1)))
+        assertEquals(64, Color.alpha(source.getPixel(1, 1)))
+        assertEquals(0, Color.alpha(source.getPixel(2, 1)))
+    }
+
+    @Test
+    fun displayP3InputIsConvertedToSrgbBeforeEncodedMetadataIsScrubbed() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) return
+
+        val sourceBytes = fixtureBytes("bitmap-display-p3.png")
+        val source = assertNotNull(BitmapFactory.decodeByteArray(sourceBytes, 0, sourceBytes.size))
+        assertEquals(android.graphics.ColorSpace.get(android.graphics.ColorSpace.Named.DISPLAY_P3), source.colorSpace)
+        val expectedSrgbPixel = source.getColor(0, 0).convert(
+            android.graphics.ColorSpace.get(android.graphics.ColorSpace.Named.SRGB),
+        )
+
+        val srgbBitmap = assertNotNull(AndroidImageProcessor.decodeSrgbBitmap(sourceBytes))
+        assertEquals(android.graphics.ColorSpace.get(android.graphics.ColorSpace.Named.SRGB), srgbBitmap.colorSpace)
+        assertEquals(Bitmap.Config.ARGB_8888, srgbBitmap.config)
+        assertColorClose(expectedSrgbPixel, srgbBitmap.getColor(0, 0), tolerance = 1.0f / 255.0f)
+
+        for ((format, tolerance) in listOf(
+            Bitmap.CompressFormat.PNG to (1.0f / 255.0f),
+            Bitmap.CompressFormat.JPEG to (2.0f / 255.0f),
+        )) {
+            val scrubbed = assertNotNull(AndroidImageProcessor.encodeAndScrub(srgbBitmap, format))
+            when (format) {
+                Bitmap.CompressFormat.PNG -> {
+                    assertEquals(listOf("IHDR", "sRGB", "sBIT", "IDAT", "IEND"), pngChunkTypes(scrubbed))
+                }
+                Bitmap.CompressFormat.JPEG -> {
+                    assertEquals(listOf(0xE0), jpegMetadataMarkers(scrubbed))
+                }
+                else -> error("Unexpected format: $format")
+            }
+
+            val decodedOutput = assertNotNull(BitmapFactory.decodeByteArray(scrubbed, 0, scrubbed.size))
+            assertEquals(
+                android.graphics.ColorSpace.get(android.graphics.ColorSpace.Named.SRGB),
+                decodedOutput.colorSpace,
+            )
+            assertColorClose(expectedSrgbPixel, decodedOutput.getColor(0, 0), tolerance)
+        }
+    }
+
+    private fun assertPngPixelsPreserved(expectedBytes: ByteArray, actualBytes: ByteArray) {
+        val expected = assertNotNull(BitmapFactory.decodeByteArray(expectedBytes, 0, expectedBytes.size))
+        val actual = assertNotNull(BitmapFactory.decodeByteArray(actualBytes, 0, actualBytes.size))
+        assertEquals(expected.width, actual.width)
+        assertEquals(expected.height, actual.height)
+        for (y in 0 until expected.height) {
+            for (x in 0 until expected.width) {
+                assertEquals(
+                    expected.getPixel(x, y),
+                    actual.getPixel(x, y),
+                    "pixel ($x, $y)",
+                )
+            }
+        }
+    }
+
+    private fun fixtureBytes(name: String): ByteArray {
+        return requireNotNull(javaClass.getResourceAsStream("/fixtures/android/$name")) {
+            "Missing fixture: $name"
+        }.use { it.readBytes() }
+    }
+
+    private fun assertColorClose(expected: Color, actual: Color, tolerance: Float) {
+        val expectedComponents = expected.components
+        val actualComponents = actual.convert(expected.colorSpace).components
+        for (index in expectedComponents.indices) {
+            assertTrue(
+                abs(expectedComponents[index] - actualComponents[index]) <= tolerance,
+                "component $index: expected ${expectedComponents[index]}, got ${actualComponents[index]}",
+            )
+        }
+    }
+
+    private fun pngChunkTypes(bytes: ByteArray): List<String> {
+        val result = mutableListOf<String>()
+        var offset = 8
+        while (offset < bytes.size) {
+            require(bytes.size - offset >= 12)
+            val payloadLength = readUnsignedInt(bytes, offset)
+            val type = bytes.decodeToString(offset + 4, offset + 8)
+            result += type
+            offset += payloadLength + 12
+            if (type == "IEND") {
+                assertEquals(bytes.size, offset)
+                return result
+            }
+        }
+        error("PNG is missing IEND")
+    }
+
+    private fun jpegMetadataMarkers(bytes: ByteArray): List<Int> {
+        val result = mutableListOf<Int>()
+        var offset = 2
+        var inScan = false
+        while (offset < bytes.size) {
+            if (inScan && bytes[offset] != 0xFF.toByte()) {
+                offset += 1
+                continue
+            }
+            require(bytes[offset] == 0xFF.toByte())
+            while (offset < bytes.size && bytes[offset] == 0xFF.toByte()) {
+                offset += 1
+            }
+            require(offset < bytes.size)
+            val marker = bytes[offset].toInt() and 0xFF
+            offset += 1
+            if (inScan && marker == 0x00) continue
+            if (marker in 0xD0..0xD7 || marker == 0x01) continue
+            if (marker == 0xD9) {
+                assertEquals(bytes.size, offset)
+                return result
+            }
+            val segmentLength = readUnsignedShort(bytes, offset)
+            if (marker in 0xE0..0xEF || marker == 0xFE) result += marker
+            offset += segmentLength
+            inScan = marker == 0xDA
+        }
+        error("JPEG is missing EOI")
+    }
+
+    private fun readUnsignedShort(bytes: ByteArray, offset: Int): Int {
+        return ((bytes[offset].toInt() and 0xFF) shl 8) or (bytes[offset + 1].toInt() and 0xFF)
+    }
+
+    private fun readUnsignedInt(bytes: ByteArray, offset: Int): Int {
+        return ((bytes[offset].toInt() and 0xFF) shl 24) or
+            ((bytes[offset + 1].toInt() and 0xFF) shl 16) or
+            ((bytes[offset + 2].toInt() and 0xFF) shl 8) or
+            (bytes[offset + 3].toInt() and 0xFF)
+    }
+}

mobile/android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

mobile/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,71 @@
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission
+        android:name="android.permission.READ_EXTERNAL_STORAGE"
+        android:maxSdkVersion="32"
+        tools:replace="android:maxSdkVersion" />
+    <uses-permission
+        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
+        android:maxSdkVersion="28" />
+    <uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />
+    <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />
+    <uses-permission android:name="android.permission.READ_MEDIA_VISUAL_USER_SELECTED" />
+    <application
+        android:label="@string/app_name"
+        android:name="${applicationName}"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:taskAffinity=""
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+            <!-- Handle buzz:// deep links (e.g. buzz://message?channel=…&id=…). -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW"/>
+                <category android:name="android.intent.category.DEFAULT"/>
+                <category android:name="android.intent.category.BROWSABLE"/>
+                <data android:scheme="buzz"/>
+            </intent-filter>
+            <!-- Disable Flutter's built-in deeplink handler; app_links owns
+                 incoming URLs so they can be routed with app state in Dart. -->
+            <meta-data
+                android:name="flutter_deeplinking_enabled"
+                android:value="false" />
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+    <!-- Required to query activities that can process text, see:
+         https://developer.android.com/training/package-visibility and
+         https://developer.android.com/reference/android/content/Intent#ACTION_PROCESS_TEXT.
+
+         In particular, this is used by the Flutter engine in io.flutter.plugin.text.ProcessTextPlugin. -->
+    <queries>
+        <intent>
+            <action android:name="android.intent.action.PROCESS_TEXT"/>
+            <data android:mimeType="text/plain"/>
+        </intent>
+    </queries>
+</manifest>

mobile/android/app/src/main/kotlin/xyz/block/buzz/mobile/AndroidMediaSanitizer.kt

@@ -0,0 +1,160 @@
+package xyz.block.buzz.mobile
+
+import java.io.ByteArrayOutputStream
+import java.nio.charset.StandardCharsets
+
+internal object AndroidMediaSanitizer {
+    private val pngSignature = byteArrayOf(
+        0x89.toByte(), 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A,
+    )
+    private val allowedPngAncillaryChunks = setOf(
+        "cHRM", "gAMA", "sBIT", "sRGB", "bKGD", "hIST", "tRNS", "sPLT", "acTL", "fcTL", "fdAT",
+    )
+
+    fun scrubPng(bytes: ByteArray): ByteArray {
+        require(bytes.size >= pngSignature.size && bytes.copyOfRange(0, pngSignature.size).contentEquals(pngSignature)) {
+            "Invalid PNG signature"
+        }
+
+        val output = ByteArrayOutputStream(bytes.size)
+        output.write(pngSignature)
+        var offset = pngSignature.size
+        while (offset < bytes.size) {
+            require(bytes.size - offset >= PNG_CHUNK_OVERHEAD) { "Truncated PNG chunk" }
+            val payloadLength = readUnsignedIntBigEndian(bytes, offset)
+            require(payloadLength <= bytes.size.toLong() - offset - PNG_CHUNK_OVERHEAD) {
+                "Invalid PNG chunk length"
+            }
+            val chunkLength = payloadLength.toInt() + PNG_CHUNK_OVERHEAD
+            val typeStart = offset + 4
+            val type = String(bytes, typeStart, 4, StandardCharsets.US_ASCII)
+            val isAncillary = bytes[typeStart].toInt() and 0x20 != 0
+            if (!isAncillary || type in allowedPngAncillaryChunks) {
+                output.write(bytes, offset, chunkLength)
+            }
+            offset += chunkLength
+            if (type == "IEND") {
+                return output.toByteArray()
+            }
+        }
+
+        throw IllegalArgumentException("PNG is missing IEND")
+    }
+
+    fun scrubJpeg(bytes: ByteArray): ByteArray {
+        require(
+            bytes.size >= 2 &&
+                bytes[0] == 0xFF.toByte() &&
+                (bytes[1].toInt() and 0xFF) == JPEG_SOI,
+        ) {
+            "Invalid JPEG signature"
+        }
+
+        val output = ByteArrayOutputStream(bytes.size)
+        output.write(byteArrayOf(0xFF.toByte(), JPEG_SOI.toByte()))
+        var offset = 2
+        var inScan = false
+        while (offset < bytes.size) {
+            if (inScan && bytes[offset] != 0xFF.toByte()) {
+                val nextMarker = bytes.indexOf(0xFF.toByte(), offset).let { if (it == -1) bytes.size else it }
+                output.write(bytes, offset, nextMarker - offset)
+                offset = nextMarker
+                continue
+            }
+            require(bytes[offset] == 0xFF.toByte()) { "Invalid JPEG marker" }
+
+            val markerStart = offset
+            while (offset < bytes.size && bytes[offset] == 0xFF.toByte()) {
+                offset += 1
+            }
+            require(offset < bytes.size) { "Truncated JPEG marker" }
+
+            val marker = bytes[offset].toInt() and 0xFF
+            offset += 1
+            if (inScan && marker == 0x00) {
+                output.write(bytes, markerStart, offset - markerStart)
+                continue
+            }
+            if (marker in JPEG_RESTART_MARKERS || marker == JPEG_TEMP) {
+                output.write(bytes, markerStart, offset - markerStart)
+                continue
+            }
+            if (marker == JPEG_EOI) {
+                output.write(bytes, markerStart, offset - markerStart)
+                return output.toByteArray()
+            }
+            require(marker != JPEG_SOI && bytes.size - offset >= 2) { "Invalid JPEG segment" }
+
+            val segmentLength = readUnsignedShortBigEndian(bytes, offset)
+            require(segmentLength >= 2 && segmentLength <= bytes.size - offset) { "Invalid JPEG segment length" }
+            val segmentEnd = offset + segmentLength
+            if (shouldKeepJpegSegment(marker, bytes, offset + 2, segmentEnd)) {
+                output.write(bytes, markerStart, segmentEnd - markerStart)
+            }
+            offset = segmentEnd
+            inScan = marker == JPEG_SOS
+        }
+
+        throw IllegalArgumentException("JPEG is missing EOI")
+    }
+
+    private fun shouldKeepJpegSegment(
+        marker: Int,
+        bytes: ByteArray,
+        payloadStart: Int,
+        payloadEnd: Int,
+    ): Boolean {
+        val payloadLength = payloadEnd - payloadStart
+        return when (marker) {
+            JPEG_APP0 -> {
+                if (payloadLength < 14 || !bytes.matchesAscii(payloadStart, "JFIF\u0000")) {
+                    false
+                } else {
+                    val thumbnailWidth = bytes[payloadStart + 12].toInt() and 0xFF
+                    val thumbnailHeight = bytes[payloadStart + 13].toInt() and 0xFF
+                    payloadLength == 14 + 3 * thumbnailWidth * thumbnailHeight
+                }
+            }
+            JPEG_APP14 -> payloadLength == 12 && bytes.matchesAscii(payloadStart, "Adobe")
+            in JPEG_FORBIDDEN_APP_MARKERS, JPEG_APP15, JPEG_COMMENT -> false
+            else -> true
+        }
+    }
+
+    private fun readUnsignedShortBigEndian(bytes: ByteArray, offset: Int): Int {
+        require(bytes.size - offset >= 2) { "Truncated two-byte integer" }
+        return (bytes[offset].toInt() and 0xFF shl 8) or (bytes[offset + 1].toInt() and 0xFF)
+    }
+
+    private fun readUnsignedIntBigEndian(bytes: ByteArray, offset: Int): Long {
+        require(bytes.size - offset >= 4) { "Truncated four-byte integer" }
+        return (bytes[offset].toLong() and 0xFF shl 24) or
+            (bytes[offset + 1].toLong() and 0xFF shl 16) or
+            (bytes[offset + 2].toLong() and 0xFF shl 8) or
+            (bytes[offset + 3].toLong() and 0xFF)
+    }
+
+    private fun ByteArray.matchesAscii(offset: Int, value: String): Boolean {
+        val expected = value.toByteArray(StandardCharsets.US_ASCII)
+        return size - offset >= expected.size && expected.indices.all { this[offset + it] == expected[it] }
+    }
+
+    private fun ByteArray.indexOf(value: Byte, startIndex: Int): Int {
+        for (index in startIndex until size) {
+            if (this[index] == value) return index
+        }
+        return -1
+    }
+
+    private const val PNG_CHUNK_OVERHEAD = 12
+    private const val JPEG_SOI = 0xD8
+    private const val JPEG_EOI = 0xD9
+    private const val JPEG_SOS = 0xDA
+    private const val JPEG_TEMP = 0x01
+    private const val JPEG_APP0 = 0xE0
+    private const val JPEG_APP14 = 0xEE
+    private const val JPEG_APP15 = 0xEF
+    private const val JPEG_COMMENT = 0xFE
+    private val JPEG_RESTART_MARKERS = 0xD0..0xD7
+    private val JPEG_FORBIDDEN_APP_MARKERS = 0xE1..0xED
+}

mobile/android/app/src/main/kotlin/xyz/block/buzz/mobile/MainActivity.kt

@@ -0,0 +1,347 @@
+package xyz.block.buzz.mobile
+
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.graphics.Canvas
+import android.graphics.ColorSpace
+import android.graphics.ImageDecoder
+import android.media.MediaExtractor
+import android.media.MediaMetadataRetriever
+import android.media.MediaMuxer
+import android.os.Build
+import androidx.annotation.RequiresApi
+import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
+import java.io.ByteArrayOutputStream
+import java.io.File
+import java.nio.ByteBuffer
+import java.util.UUID
+
+internal object AndroidImageProcessor {
+    fun decodeSrgbBitmap(bytes: ByteArray): Bitmap? {
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            decodeSrgbBitmapWithColorManagement(bytes)
+        } else {
+            BitmapFactory.decodeByteArray(bytes, 0, bytes.size)
+        }
+    }
+
+    @RequiresApi(Build.VERSION_CODES.O)
+    private fun decodeSrgbBitmapWithColorManagement(bytes: ByteArray): Bitmap? {
+        val decoded = decodeColorManagedBitmap(bytes) ?: return null
+        val srgb = ColorSpace.get(ColorSpace.Named.SRGB)
+        if (decoded.config == Bitmap.Config.ARGB_8888 && decoded.colorSpace == srgb) return decoded
+
+        val srgbBitmap = Bitmap.createBitmap(
+            decoded.width,
+            decoded.height,
+            Bitmap.Config.ARGB_8888,
+            decoded.hasAlpha(),
+            srgb,
+        )
+        Canvas(srgbBitmap).drawBitmap(decoded, 0f, 0f, null)
+        return srgbBitmap
+    }
+
+    @RequiresApi(Build.VERSION_CODES.O)
+    private fun decodeColorManagedBitmap(bytes: ByteArray): Bitmap? {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+            runCatching {
+                val source = ImageDecoder.createSource(ByteBuffer.wrap(bytes))
+                ImageDecoder.decodeBitmap(source) { decoder, _, _ ->
+                    decoder.allocator = ImageDecoder.ALLOCATOR_SOFTWARE
+                    decoder.setTargetColorSpace(ColorSpace.get(ColorSpace.Named.SRGB))
+                }
+            }.getOrNull()?.let { return it }
+        }
+
+        val options = BitmapFactory.Options().apply {
+            inPreferredColorSpace = ColorSpace.get(ColorSpace.Named.SRGB)
+        }
+        return BitmapFactory.decodeByteArray(bytes, 0, bytes.size, options)
+    }
+
+    fun encodeAndScrub(
+        bitmap: Bitmap,
+        format: Bitmap.CompressFormat,
+    ): ByteArray? {
+        val output = ByteArrayOutputStream()
+        if (!bitmap.compress(format, 100, output)) return null
+
+        return when (format) {
+            Bitmap.CompressFormat.PNG -> AndroidMediaSanitizer.scrubPng(output.toByteArray())
+            Bitmap.CompressFormat.JPEG -> AndroidMediaSanitizer.scrubJpeg(output.toByteArray())
+            else -> error("Unsupported upload image format: $format")
+        }
+    }
+}
+
+class MainActivity : FlutterActivity() {
+    private var mediaUploadChannel: MethodChannel? = null
+
+    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+        super.configureFlutterEngine(flutterEngine)
+
+        mediaUploadChannel = MethodChannel(
+            flutterEngine.dartExecutor.binaryMessenger,
+            MEDIA_UPLOAD_CHANNEL,
+        ).also { channel ->
+            channel.setMethodCallHandler { call, result ->
+                when (call.method) {
+                    SANITIZE_IMAGE_FOR_UPLOAD_METHOD -> {
+                        handleSanitizeImageForUpload(call.arguments, result)
+                    }
+                    TRANSCODE_IMAGE_TO_JPEG_METHOD -> {
+                        handleTranscodeImageToJpeg(call.arguments, result)
+                    }
+                    TRANSCODE_VIDEO_TO_MP4_METHOD -> {
+                        handleTranscodeVideoToMp4(call.arguments, result)
+                    }
+                    GENERATE_VIDEO_POSTER_METHOD -> {
+                        handleGenerateVideoPoster(call.arguments, result)
+                    }
+                    REQUIRES_LEGACY_MEDIA_STORAGE_PERMISSION_METHOD -> {
+                        result.success(Build.VERSION.SDK_INT <= Build.VERSION_CODES.P)
+                    }
+                    else -> result.notImplemented()
+                }
+            }
+        }
+    }
+
+    private fun handleSanitizeImageForUpload(
+        arguments: Any?,
+        result: MethodChannel.Result,
+    ) {
+        val payload = arguments as? Map<*, *> ?: run {
+            invalidArguments(result, "Expected image bytes and mime type.")
+            return
+        }
+        val bytes = payload["bytes"] as? ByteArray ?: run {
+            invalidArguments(result, "Expected raw image bytes.")
+            return
+        }
+        val mimeType = payload["mimeType"] as? String ?: run {
+            invalidArguments(result, "Expected image mime type.")
+            return
+        }
+
+        val format = sanitizeCompressFormatFor(mimeType)
+        if (format == null) {
+            result.error(
+                "sanitize_failed",
+                "Unable to sanitize picked image.",
+                mimeType,
+            )
+            return
+        }
+
+        transformImageBytes(
+            bytes = bytes,
+            result = result,
+            format = format,
+            errorCode = "sanitize_failed",
+            encodeFailureMessage = "Unable to sanitize picked image.",
+            errorDetails = mimeType,
+        )
+    }
+
+    private fun handleTranscodeImageToJpeg(
+        arguments: Any?,
+        result: MethodChannel.Result,
+    ) {
+        val bytes = arguments as? ByteArray ?: run {
+            invalidArguments(result, "Expected raw image bytes.")
+            return
+        }
+
+        transformImageBytes(
+            bytes = bytes,
+            result = result,
+            format = Bitmap.CompressFormat.JPEG,
+            errorCode = "transcode_failed",
+            encodeFailureMessage = "Unable to convert picked image to JPEG.",
+        )
+    }
+
+    private fun sanitizeCompressFormatFor(
+        mimeType: String,
+    ): Bitmap.CompressFormat? {
+        return when (mimeType) {
+            "image/jpeg" -> Bitmap.CompressFormat.JPEG
+            "image/png", "image/webp" -> Bitmap.CompressFormat.PNG
+            else -> null
+        }
+    }
+
+    private fun transformImageBytes(
+        bytes: ByteArray,
+        result: MethodChannel.Result,
+        format: Bitmap.CompressFormat,
+        errorCode: String,
+        encodeFailureMessage: String,
+        errorDetails: Any? = null,
+    ) {
+        val bitmap = AndroidImageProcessor.decodeSrgbBitmap(bytes) ?: run {
+            result.error(
+                errorCode,
+                "Unable to decode picked image.",
+                null,
+            )
+            return
+        }
+
+        val transformedBytes = try {
+            AndroidImageProcessor.encodeAndScrub(bitmap, format)
+        } catch (_: IllegalArgumentException) {
+            null
+        } ?: run {
+            result.error(
+                errorCode,
+                encodeFailureMessage,
+                errorDetails,
+            )
+            return
+        }
+
+        result.success(transformedBytes)
+    }
+
+    private fun handleTranscodeVideoToMp4(
+        arguments: Any?,
+        result: MethodChannel.Result,
+    ) {
+        val sourcePath = arguments as? String ?: run {
+            invalidArguments(result, "Expected source file path as String.")
+            return
+        }
+
+        Thread {
+            val outputFile = File(cacheDir, "${UUID.randomUUID()}.mp4")
+            var muxer: MediaMuxer? = null
+            val extractor = MediaExtractor()
+            try {
+                extractor.setDataSource(sourcePath)
+                muxer = MediaMuxer(outputFile.absolutePath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4)
+
+                val trackIndices = mutableMapOf<Int, Int>()
+                var copiedVideo = false
+                var copiedAudio = false
+                for (i in 0 until extractor.trackCount) {
+                    val format = extractor.getTrackFormat(i)
+                    val mime = format.getString(android.media.MediaFormat.KEY_MIME) ?: continue
+                    val isVideo = mime.startsWith("video/")
+                    val isAudio = mime.startsWith("audio/")
+                    if ((!isVideo && !isAudio) || (isVideo && copiedVideo) || (isAudio && copiedAudio)) {
+                        continue
+                    }
+                    val newIndex = muxer.addTrack(format)
+                    trackIndices[i] = newIndex
+                    extractor.selectTrack(i)
+                    copiedVideo = copiedVideo || isVideo
+                    copiedAudio = copiedAudio || isAudio
+                }
+
+                muxer.start()
+                val buffer = ByteBuffer.allocate(1024 * 1024) // 1MB buffer
+                val bufferInfo = android.media.MediaCodec.BufferInfo()
+
+                while (true) {
+                    val sampleSize = extractor.readSampleData(buffer, 0)
+                    if (sampleSize < 0) break
+                    val muxerTrack = trackIndices[extractor.sampleTrackIndex]
+                    if (muxerTrack == null) {
+                        extractor.advance()
+                        continue
+                    }
+                    bufferInfo.offset = 0
+                    bufferInfo.size = sampleSize
+                    bufferInfo.presentationTimeUs = extractor.sampleTime
+                    bufferInfo.flags = extractor.sampleFlags
+                    muxer.writeSampleData(muxerTrack, buffer, bufferInfo)
+                    extractor.advance()
+                }
+
+                muxer.stop()
+                result.success(outputFile.absolutePath)
+            } catch (e: Exception) {
+                outputFile.delete()
+                result.error(
+                    "transcode_failed",
+                    e.message ?: "Video transcoding failed.",
+                    null,
+                )
+            } finally {
+                try { muxer?.release() } catch (_: Exception) {}
+                extractor.release()
+            }
+        }.start()
+    }
+
+    private fun handleGenerateVideoPoster(
+        arguments: Any?,
+        result: MethodChannel.Result,
+    ) {
+        val sourcePath = arguments as? String ?: run {
+            invalidArguments(result, "Expected source file path as String.")
+            return
+        }
+
+        Thread {
+            val retriever = MediaMetadataRetriever()
+            try {
+                retriever.setDataSource(sourcePath)
+                val source = retriever.getFrameAtTime(
+                    0,
+                    MediaMetadataRetriever.OPTION_CLOSEST_SYNC,
+                ) ?: retriever.getFrameAtTime(
+                    100_000,
+                    MediaMetadataRetriever.OPTION_CLOSEST_SYNC,
+                ) ?: throw IllegalArgumentException("Unable to decode a video frame.")
+                val scale = minOf(1f, 720f / maxOf(source.width, source.height))
+                val frame = if (scale < 1f) {
+                    Bitmap.createScaledBitmap(
+                        source,
+                        (source.width * scale).toInt(),
+                        (source.height * scale).toInt(),
+                        true,
+                    ).also { source.recycle() }
+                } else {
+                    source
+                }
+                val bytes = AndroidImageProcessor.encodeAndScrub(
+                    frame,
+                    Bitmap.CompressFormat.JPEG,
+                ) ?: throw IllegalArgumentException("Unable to encode a video preview.")
+                frame.recycle()
+                result.success(bytes)
+            } catch (e: Exception) {
+                result.error(
+                    "poster_failed",
+                    "Unable to create a video preview.",
+                    e.message,
+                )
+            } finally {
+                retriever.release()
+            }
+        }.start()
+    }
+
+    private fun invalidArguments(
+        result: MethodChannel.Result,
+        message: String,
+    ) {
+        result.error("invalid_arguments", message, null)
+    }
+
+    companion object {
+        private const val MEDIA_UPLOAD_CHANNEL = "buzz/media_upload"
+        private const val SANITIZE_IMAGE_FOR_UPLOAD_METHOD = "sanitizeImageForUpload"
+        private const val TRANSCODE_IMAGE_TO_JPEG_METHOD = "transcodeImageToJpeg"
+        private const val TRANSCODE_VIDEO_TO_MP4_METHOD = "transcodeVideoToMp4"
+        private const val GENERATE_VIDEO_POSTER_METHOD = "generateVideoPoster"
+        private const val REQUIRES_LEGACY_MEDIA_STORAGE_PERMISSION_METHOD =
+            "requiresLegacyMediaStoragePermission"
+    }
+}

mobile/android/app/src/main/res/drawable-v21/launch_background.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/black" />
+
+    <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item>
+</layer-list>

mobile/android/app/src/main/res/drawable/ic_launcher_foreground_inset.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<inset xmlns:android="http://schemas.android.com/apk/res/android"
+    android:drawable="@mipmap/ic_launcher_foreground"
+    android:inset="10%" />

mobile/android/app/src/main/res/drawable/launch_background.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/black" />
+
+    <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item>
+</layer-list>

mobile/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+  <foreground android:drawable="@drawable/ic_launcher_foreground_inset"/>
+  <background android:drawable="@color/ic_launcher_background"/>
+</adaptive-icon>

mobile/android/app/src/main/res/values-night/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

mobile/android/app/src/main/res/values/ic_launcher_background.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+  <color name="ic_launcher_background">#000</color>
+</resources>

mobile/android/app/src/main/res/values/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

mobile/android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

mobile/android/app/src/test/kotlin/xyz/block/buzz/mobile/AndroidMediaSanitizerTest.kt

@@ -0,0 +1,128 @@
+package xyz.block.buzz.mobile
+
+import kotlin.test.Test
+import kotlin.test.assertContentEquals
+import kotlin.test.assertEquals
+import kotlin.test.assertFailsWith
+
+class AndroidMediaSanitizerTest {
+    @Test
+    fun `scrubPng keeps canonical sRGB output unchanged`() {
+        val fixture = fixtureBytes("bitmap-srgb.png")
+
+        val sanitized = AndroidMediaSanitizer.scrubPng(fixture)
+
+        assertContentEquals(fixture, sanitized)
+        assertEquals(listOf("IHDR", "sRGB", "sBIT", "IDAT", "IEND"), pngChunkTypes(sanitized))
+    }
+
+    @Test
+    fun `scrubPng removes Display P3 profile and trailing data`() {
+        val fixture = fixtureBytes("bitmap-display-p3.png")
+        val withTrailingData = fixture + "hidden location".encodeToByteArray()
+
+        val sanitized = AndroidMediaSanitizer.scrubPng(withTrailingData)
+
+        assertEquals(listOf("IHDR", "sBIT", "IDAT", "IEND"), pngChunkTypes(sanitized))
+    }
+
+    @Test
+    fun `scrubJpeg removes Android ICC profile and trailing data`() {
+        for (fixtureName in listOf("bitmap-srgb.jpg", "bitmap-display-p3.jpg")) {
+            val fixture = fixtureBytes(fixtureName)
+            val withTrailingData = fixture + "hidden location".encodeToByteArray()
+
+            val sanitized = AndroidMediaSanitizer.scrubJpeg(withTrailingData)
+
+            assertEquals(listOf(0xE0), jpegMetadataMarkers(sanitized), fixtureName)
+        }
+    }
+
+    @Test
+    fun `scrubbers fail closed for malformed containers`() {
+        assertFailsWith<IllegalArgumentException> {
+            AndroidMediaSanitizer.scrubPng(byteArrayOf(0x89.toByte(), 0x50, 0x4E, 0x47))
+        }
+        assertFailsWith<IllegalArgumentException> {
+            AndroidMediaSanitizer.scrubJpeg(byteArrayOf(0xFF.toByte(), 0xD8.toByte(), 0xFF.toByte()))
+        }
+        assertFailsWith<IllegalArgumentException> {
+            AndroidMediaSanitizer.scrubJpeg(
+                byteArrayOf(
+                    0xFF.toByte(),
+                    0xD8.toByte(),
+                    0xFF.toByte(),
+                    0xD8.toByte(),
+                    0x00,
+                    0x02,
+                    0xFF.toByte(),
+                    0xD9.toByte(),
+                ),
+            )
+        }
+    }
+
+    private fun fixtureBytes(name: String): ByteArray {
+        return requireNotNull(javaClass.getResourceAsStream("/fixtures/android/$name")) {
+            "Missing fixture: $name"
+        }.use { it.readBytes() }
+    }
+
+    private fun pngChunkTypes(bytes: ByteArray): List<String> {
+        val result = mutableListOf<String>()
+        var offset = 8
+        while (offset < bytes.size) {
+            require(bytes.size - offset >= 12)
+            val payloadLength = readUnsignedInt(bytes, offset)
+            val type = bytes.decodeToString(offset + 4, offset + 8)
+            result += type
+            offset += payloadLength + 12
+            if (type == "IEND") {
+                assertEquals(bytes.size, offset)
+                return result
+            }
+        }
+        error("PNG is missing IEND")
+    }
+
+    private fun jpegMetadataMarkers(bytes: ByteArray): List<Int> {
+        val result = mutableListOf<Int>()
+        var offset = 2
+        var inScan = false
+        while (offset < bytes.size) {
+            if (inScan && bytes[offset] != 0xFF.toByte()) {
+                offset += 1
+                continue
+            }
+            require(bytes[offset] == 0xFF.toByte())
+            while (offset < bytes.size && bytes[offset] == 0xFF.toByte()) {
+                offset += 1
+            }
+            require(offset < bytes.size)
+            val marker = bytes[offset].toInt() and 0xFF
+            offset += 1
+            if (inScan && marker == 0x00) continue
+            if (marker in 0xD0..0xD7 || marker == 0x01) continue
+            if (marker == 0xD9) {
+                assertEquals(bytes.size, offset)
+                return result
+            }
+            val segmentLength = readUnsignedShort(bytes, offset)
+            if (marker in 0xE0..0xEF || marker == 0xFE) result += marker
+            offset += segmentLength
+            inScan = marker == 0xDA
+        }
+        error("JPEG is missing EOI")
+    }
+
+    private fun readUnsignedShort(bytes: ByteArray, offset: Int): Int {
+        return ((bytes[offset].toInt() and 0xFF) shl 8) or (bytes[offset + 1].toInt() and 0xFF)
+    }
+
+    private fun readUnsignedInt(bytes: ByteArray, offset: Int): Int {
+        return ((bytes[offset].toInt() and 0xFF) shl 24) or
+            ((bytes[offset + 1].toInt() and 0xFF) shl 16) or
+            ((bytes[offset + 2].toInt() and 0xFF) shl 8) or
+            (bytes[offset + 3].toInt() and 0xFF)
+    }
+}

mobile/android/build.gradle.kts

@@ -0,0 +1,24 @@
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+val newBuildDir: Directory =
+    rootProject.layout.buildDirectory
+        .dir("../../build")
+        .get()
+rootProject.layout.buildDirectory.value(newBuildDir)
+
+subprojects {
+    val newSubprojectBuildDir: Directory = newBuildDir.dir(project.name)
+    project.layout.buildDirectory.value(newSubprojectBuildDir)
+}
+subprojects {
+    project.evaluationDependsOn(":app")
+}
+
+tasks.register<Delete>("clean") {
+    delete(rootProject.layout.buildDirectory)
+}

mobile/android/gradle.properties

@@ -0,0 +1,2 @@
+org.gradle.jvmargs=-Xmx8G -XX:MaxMetaspaceSize=4G -XX:ReservedCodeCacheSize=512m -XX:+HeapDumpOnOutOfMemoryError
+android.useAndroidX=true

mobile/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.5-all.zip

mobile/android/settings.gradle.kts

@@ -0,0 +1,26 @@
+pluginManagement {
+    val flutterSdkPath =
+        run {
+            val properties = java.util.Properties()
+            file("local.properties").inputStream().use { properties.load(it) }
+            val flutterSdkPath = properties.getProperty("flutter.sdk")
+            require(flutterSdkPath != null) { "flutter.sdk not set in local.properties" }
+            flutterSdkPath
+        }
+
+    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
+
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+plugins {
+    id("dev.flutter.flutter-plugin-loader") version "1.0.0"
+    id("com.android.application") version "8.11.2" apply false
+    id("org.jetbrains.kotlin.android") version "2.2.21" apply false
+}
+
+include(":app")

mobile/assets/fonts/Inter-LICENSE.txt

@@ -0,0 +1,92 @@
+Copyright (c) 2016 The Inter Project Authors (https://github.com/rsms/inter)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION AND CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

mobile/ios/.gitignore

@@ -0,0 +1,36 @@
+**/dgph
+*.mode1v3
+*.mode2v3
+*.moved-aside
+*.pbxuser
+*.perspectivev3
+**/*sync/
+.sconsign.dblite
+.tags*
+**/.vagrant/
+**/DerivedData/
+Icon?
+**/Pods/
+**/.symlinks/
+profile
+xcuserdata
+**/.generated/
+Flutter/App.framework
+Flutter/AppOverrides.xcconfig
+Flutter/WorktreeOverrides.xcconfig
+Flutter/Flutter.framework
+Flutter/Flutter.podspec
+Flutter/Generated.xcconfig
+Flutter/ephemeral/
+Flutter/app.flx
+Flutter/app.zip
+Flutter/flutter_assets/
+Flutter/flutter_export_environment.sh
+ServiceDefinitions.json
+Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!default.mode1v3
+!default.mode2v3
+!default.pbxuser
+!default.perspectivev3

mobile/ios/Flutter/AppFrameworkInfo.plist

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+</dict>
+</plist>

mobile/ios/Flutter/Debug.xcconfig

@@ -0,0 +1,21 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
+#include "Generated.xcconfig"
+
+// Default app bundle identifier. Internal/custom builds can override this
+// without patching tracked files by writing
+// `mobile/ios/Flutter/AppOverrides.xcconfig` containing
+// `BUNDLE_IDENTIFIER = your.app.id` (gitignored).
+BUNDLE_IDENTIFIER = com.buzz.buzzMobile
+APP_DISPLAY_NAME = Buzz
+
+// Worktree-aware debug identity (gitignored, written by
+// scripts/mobile-worktree-overrides.sh): a per-worktree bundle identifier
+// and a branch-labelled display name so debug builds from multiple worktrees
+// install side by side. Release and Profile builds never include it.
+#include? "WorktreeOverrides.xcconfig"
+
+// Developer app-specific overrides are included last: xcconfig
+// later-include-wins is per variable, so a personal BUNDLE_IDENTIFIER for
+// device signing beats the worktree default while unset variables still
+// fall through to the worktree values.
+#include? "AppOverrides.xcconfig"

mobile/ios/Flutter/Release.xcconfig

@@ -0,0 +1,11 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
+#include "Generated.xcconfig"
+
+// Defaults for the iOS Release build. Internal/custom builds (e.g. an
+// enterprise-signed distribution) override these without patching tracked
+// files by writing `mobile/ios/Flutter/AppOverrides.xcconfig` (gitignored).
+BUNDLE_IDENTIFIER = com.buzz.buzzMobile
+APP_DISPLAY_NAME = Buzz
+CODE_SIGN_STYLE = Automatic
+CODE_SIGN_IDENTITY = iPhone Developer
+#include? "AppOverrides.xcconfig"

mobile/ios/Podfile

@@ -0,0 +1,42 @@
+platform :ios, '16.0'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
+  end
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_ios_podfile_setup
+
+target 'Runner' do
+  use_frameworks!
+
+  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
+  target 'RunnerTests' do
+    inherit! :search_paths
+  end
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_ios_build_settings(target)
+  end
+end

mobile/ios/Podfile.lock

@@ -0,0 +1,111 @@
+PODS:
+  - app_badge_plus (1.2.10):
+    - Flutter
+  - app_links (6.4.1):
+    - Flutter
+  - camera_avfoundation (0.0.1):
+    - Flutter
+  - connectivity_plus (0.0.1):
+    - Flutter
+  - file_selector_ios (0.0.1):
+    - Flutter
+  - Flutter (1.0.0)
+  - flutter_secure_storage_darwin (10.0.0):
+    - Flutter
+    - FlutterMacOS
+  - image_picker_ios (0.0.1):
+    - Flutter
+  - mobile_scanner (7.0.0):
+    - Flutter
+    - FlutterMacOS
+  - open_filex (0.0.2):
+    - Flutter
+  - package_info_plus (0.4.5):
+    - Flutter
+  - photo_manager (3.11.0):
+    - Flutter
+    - FlutterMacOS
+  - share_plus (0.0.1):
+    - Flutter
+  - shared_preferences_foundation (0.0.1):
+    - Flutter
+    - FlutterMacOS
+  - url_launcher_ios (0.0.1):
+    - Flutter
+  - video_player_avfoundation (0.0.1):
+    - Flutter
+    - FlutterMacOS
+
+DEPENDENCIES:
+  - app_badge_plus (from `.symlinks/plugins/app_badge_plus/ios`)
+  - app_links (from `.symlinks/plugins/app_links/ios`)
+  - camera_avfoundation (from `.symlinks/plugins/camera_avfoundation/ios`)
+  - connectivity_plus (from `.symlinks/plugins/connectivity_plus/ios`)
+  - file_selector_ios (from `.symlinks/plugins/file_selector_ios/ios`)
+  - Flutter (from `Flutter`)
+  - flutter_secure_storage_darwin (from `.symlinks/plugins/flutter_secure_storage_darwin/darwin`)
+  - image_picker_ios (from `.symlinks/plugins/image_picker_ios/ios`)
+  - mobile_scanner (from `.symlinks/plugins/mobile_scanner/darwin`)
+  - open_filex (from `.symlinks/plugins/open_filex/ios`)
+  - package_info_plus (from `.symlinks/plugins/package_info_plus/ios`)
+  - photo_manager (from `.symlinks/plugins/photo_manager/darwin`)
+  - share_plus (from `.symlinks/plugins/share_plus/ios`)
+  - shared_preferences_foundation (from `.symlinks/plugins/shared_preferences_foundation/darwin`)
+  - url_launcher_ios (from `.symlinks/plugins/url_launcher_ios/ios`)
+  - video_player_avfoundation (from `.symlinks/plugins/video_player_avfoundation/darwin`)
+
+EXTERNAL SOURCES:
+  app_badge_plus:
+    :path: ".symlinks/plugins/app_badge_plus/ios"
+  app_links:
+    :path: ".symlinks/plugins/app_links/ios"
+  camera_avfoundation:
+    :path: ".symlinks/plugins/camera_avfoundation/ios"
+  connectivity_plus:
+    :path: ".symlinks/plugins/connectivity_plus/ios"
+  file_selector_ios:
+    :path: ".symlinks/plugins/file_selector_ios/ios"
+  Flutter:
+    :path: Flutter
+  flutter_secure_storage_darwin:
+    :path: ".symlinks/plugins/flutter_secure_storage_darwin/darwin"
+  image_picker_ios:
+    :path: ".symlinks/plugins/image_picker_ios/ios"
+  mobile_scanner:
+    :path: ".symlinks/plugins/mobile_scanner/darwin"
+  open_filex:
+    :path: ".symlinks/plugins/open_filex/ios"
+  package_info_plus:
+    :path: ".symlinks/plugins/package_info_plus/ios"
+  photo_manager:
+    :path: ".symlinks/plugins/photo_manager/darwin"
+  share_plus:
+    :path: ".symlinks/plugins/share_plus/ios"
+  shared_preferences_foundation:
+    :path: ".symlinks/plugins/shared_preferences_foundation/darwin"
+  url_launcher_ios:
+    :path: ".symlinks/plugins/url_launcher_ios/ios"
+  video_player_avfoundation:
+    :path: ".symlinks/plugins/video_player_avfoundation/darwin"
+
+SPEC CHECKSUMS:
+  app_badge_plus: 09939f19a075cc742cc155d8ed85e6d8601f0104
+  app_links: 3dbc685f76b1693c66a6d9dd1e9ab6f73d97dc0a
+  camera_avfoundation: 968a9a5323c79a99c166ad9d7866bfd2047b5a9b
+  connectivity_plus: cb623214f4e1f6ef8fe7403d580fdad517d2f7dd
+  file_selector_ios: ec57ec07954363dd730b642e765e58f199bb621a
+  Flutter: cabc95a1d2626b1b06e7179b784ebcf0c0cde467
+  flutter_secure_storage_darwin: acdb3f316ed05a3e68f856e0353b133eec373a23
+  image_picker_ios: e0ece4aa2a75771a7de3fa735d26d90817041326
+  mobile_scanner: 9157936403f5a0644ca3779a38ff8404c5434a93
+  open_filex: 432f3cd11432da3e39f47fcc0df2b1603854eff1
+  package_info_plus: af8e2ca6888548050f16fa2f1938db7b5a5df499
+  photo_manager: 6ab48c2ce7ec21aa06d59e6cc049f0b6d9ba7f94
+  share_plus: 50da8cb520a8f0f65671c6c6a99b3617ed10a58a
+  shared_preferences_foundation: 7036424c3d8ec98dfe75ff1667cb0cd531ec82bb
+  url_launcher_ios: 7a95fa5b60cc718a708b8f2966718e93db0cef1b
+  video_player_avfoundation: dd410b52df6d2466a42d28550e33e4146928280a
+
+PODFILE CHECKSUM: bd29822c3d5baf6b44b726f00ea3293a19339ef2
+
+COCOAPODS: 1.16.2

mobile/ios/Runner.xcodeproj/project.pbxproj

@@ -0,0 +1,776 @@
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+		97C147071CF9000F007C117D /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 7AFA3C8E1D35360C0083082E /* Release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
+				DEVELOPMENT_TEAM = "";
+				ENABLE_BITCODE = NO;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = "$(BUNDLE_IDENTIFIER)";
+				PRODUCT_NAME = Buzz;
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_VERSION = 5.0;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		331C8087294A63A400263BE5 /* Build configuration list for PBXNativeTarget "RunnerTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				331C8088294A63A400263BE5 /* Debug */,
+				331C8089294A63A400263BE5 /* Release */,
+				331C808A294A63A400263BE5 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C146E91CF9000F007C117D /* Build configuration list for PBXProject "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147031CF9000F007C117D /* Debug */,
+				97C147041CF9000F007C117D /* Release */,
+				249021D3217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147061CF9000F007C117D /* Debug */,
+				97C147071CF9000F007C117D /* Release */,
+				249021D4217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 97C146E61CF9000F007C117D /* Project object */;
+}

mobile/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

mobile/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

mobile/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

mobile/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -0,0 +1,101 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1510"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+               BuildableName = "Buzz.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      customLLDBInitFile = "$(SRCROOT)/Flutter/ephemeral/flutter_lldbinit"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Buzz.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "331C8080294A63A400263BE5"
+               BuildableName = "RunnerTests.xctest"
+               BlueprintName = "RunnerTests"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      customLLDBInitFile = "$(SRCROOT)/Flutter/ephemeral/flutter_lldbinit"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      enableGPUValidationMode = "1"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Buzz.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Buzz.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

mobile/ios/Runner.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+   <FileRef
+      location = "group:Pods/Pods.xcodeproj">
+   </FileRef>
+</Workspace>

mobile/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

mobile/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

mobile/ios/Runner/AppDelegate.swift

@@ -0,0 +1,586 @@
+import AVFoundation
+import Flutter
+import UIKit
+import UserNotifications
+
+@main
+@objc class AppDelegate: FlutterAppDelegate, FlutterImplicitEngineDelegate {
+  private var mediaUploadChannel: FlutterMethodChannel?
+  private var qrScannerChannel: FlutterMethodChannel?
+  private var inlinePhotoPickerSupportChannel: FlutterMethodChannel?
+  private var concentricSheetSurfaceChannel: FlutterMethodChannel?
+  private var nativeAttachmentPopoverCoordinator: NativeAttachmentPopoverCoordinator?
+
+  override func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    UNUserNotificationCenter.current().requestAuthorization(options: [.badge]) { _, _ in }
+    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+  }
+
+  func didInitializeImplicitFlutterEngine(_ engineBridge: FlutterImplicitEngineBridge) {
+    GeneratedPluginRegistrant.register(with: engineBridge.pluginRegistry)
+    let messenger = engineBridge.applicationRegistrar.messenger()
+    mediaUploadChannel = FlutterMethodChannel(
+      name: "buzz/media_upload",
+      binaryMessenger: messenger
+    )
+    mediaUploadChannel?.setMethodCallHandler { [weak self] call, result in
+      self?.handleMediaUploadMethodCall(call, result: result)
+    }
+    qrScannerChannel = FlutterMethodChannel(
+      name: "buzz/qr_scanner",
+      binaryMessenger: messenger
+    )
+    qrScannerChannel?.setMethodCallHandler { call, result in
+      Self.handleQrScannerMethodCall(call, result: result)
+    }
+    inlinePhotoPickerSupportChannel = FlutterMethodChannel(
+      name: "buzz/inline_photo_picker",
+      binaryMessenger: messenger
+    )
+    inlinePhotoPickerSupportChannel?.setMethodCallHandler { call, result in
+      guard call.method == "isSupported" else {
+        result(FlutterMethodNotImplemented)
+        return
+      }
+      if #available(iOS 17.0, *) {
+        result(true)
+      } else {
+        result(false)
+      }
+    }
+
+    if let inlinePhotoPickerRegistrar = engineBridge.pluginRegistry.registrar(
+      forPlugin: "BuzzInlinePhotoPicker"
+    ) {
+      inlinePhotoPickerRegistrar.register(
+        InlinePhotoPickerFactory(
+          messenger: messenger,
+          parentViewController: inlinePhotoPickerRegistrar.viewController
+        ),
+        withId: "buzz/inline_photo_picker"
+      )
+    }
+
+    if let concentricSheetRegistrar = engineBridge.pluginRegistry.registrar(
+      forPlugin: "BuzzConcentricSheetSurface"
+    ) {
+      concentricSheetRegistrar.register(
+        ConcentricSheetSurfaceFactory(),
+        withId: "buzz/concentric_sheet_surface"
+      )
+      concentricSheetSurfaceChannel = FlutterMethodChannel(
+        name: "buzz/concentric_sheet_surface",
+        binaryMessenger: messenger
+      )
+      concentricSheetSurfaceChannel?.setMethodCallHandler { call, result in
+        guard call.method == "isSupported" else {
+          result(FlutterMethodNotImplemented)
+          return
+        }
+        if #available(iOS 26.0, *) {
+          result(true)
+        } else {
+          result(false)
+        }
+      }
+    }
+
+    let nativeAttachmentRegistrar = engineBridge.pluginRegistry.registrar(
+      forPlugin: "BuzzNativeAttachmentPopover"
+    )
+    nativeAttachmentPopoverCoordinator = NativeAttachmentPopoverCoordinator(
+      messenger: messenger,
+      parentViewController: nativeAttachmentRegistrar?.viewController
+    )
+  }
+
+  private static func handleQrScannerMethodCall(
+    _ call: FlutterMethodCall,
+    result: @escaping FlutterResult
+  ) {
+    switch call.method {
+    case "usesDynamicIslandQrScannerPortal":
+      result(
+        UIDevice.current.userInterfaceIdiom == .phone
+          && usesDynamicIslandQrScannerPortal(
+            safeAreaTopInset: activeWindowSafeAreaTopInset()
+          )
+      )
+    case "setDynamicIslandScannerStatusBarHidden":
+      guard let hidden = call.arguments as? Bool else {
+        result(
+          FlutterError(
+            code: "invalid_arguments",
+            message: "Expected a Bool status-bar visibility value.",
+            details: nil
+          )
+        )
+        return
+      }
+      UIApplication.shared.setStatusBarHidden(hidden, with: .fade)
+      result(nil)
+    case "performDynamicIslandQrScanSuccessHaptic":
+      let generator = UINotificationFeedbackGenerator()
+      generator.prepare()
+      generator.notificationOccurred(.success)
+      result(nil)
+    default:
+      result(FlutterMethodNotImplemented)
+    }
+  }
+
+  static func usesDynamicIslandQrScannerPortal(
+    safeAreaTopInset: CGFloat
+  ) -> Bool {
+    safeAreaTopInset > 50
+  }
+
+  private static func activeWindowSafeAreaTopInset() -> CGFloat {
+    UIApplication.shared.connectedScenes
+      .compactMap { $0 as? UIWindowScene }
+      .filter { $0.activationState == .foregroundActive }
+      .flatMap(\.windows)
+      .first(where: \.isKeyWindow)?
+      .safeAreaInsets.top ?? 0
+  }
+
+  private func handleMediaUploadMethodCall(
+    _ call: FlutterMethodCall,
+    result: @escaping FlutterResult
+  ) {
+    switch call.method {
+    case "sanitizeImageForUpload":
+      guard
+        let arguments = call.arguments as? [String: Any],
+        let typedData = arguments["bytes"] as? FlutterStandardTypedData,
+        let mimeType = arguments["mimeType"] as? String
+      else {
+        result(
+          FlutterError(
+            code: "invalid_arguments",
+            message: "Expected image bytes and mime type.",
+            details: nil
+          )
+        )
+        return
+      }
+
+      guard let image = UIImage(data: typedData.data) else {
+        result(
+          FlutterError(
+            code: "sanitize_failed",
+            message: "Unable to decode picked image.",
+            details: nil
+          )
+        )
+        return
+      }
+
+      do {
+        guard let sanitizedData = try MediaSanitizer.sanitizeImage(image, mimeType: mimeType) else {
+          result(
+            FlutterError(
+              code: "sanitize_failed",
+              message: "Unable to sanitize picked image.",
+              details: mimeType
+            )
+          )
+          return
+        }
+        result(FlutterStandardTypedData(bytes: sanitizedData))
+      } catch {
+        result(
+          FlutterError(
+            code: "sanitize_failed",
+            message: "Unable to sanitize picked image.",
+            details: mimeType
+          )
+        )
+      }
+    case "transcodeImageToJpeg":
+      guard let typedData = call.arguments as? FlutterStandardTypedData else {
+        result(
+          FlutterError(
+            code: "invalid_arguments",
+            message: "Expected raw image bytes.",
+            details: nil
+          )
+        )
+        return
+      }
+
+      guard let image = UIImage(data: typedData.data) else {
+        result(
+          FlutterError(
+            code: "transcode_failed",
+            message: "Unable to convert picked image to JPEG.",
+            details: nil
+          )
+        )
+        return
+      }
+
+      do {
+        guard let jpegData = try MediaSanitizer.encodeJpeg(image) else {
+          result(
+            FlutterError(
+              code: "transcode_failed",
+              message: "Unable to convert picked image to JPEG.",
+              details: nil
+            )
+          )
+          return
+        }
+        result(FlutterStandardTypedData(bytes: jpegData))
+      } catch {
+        result(
+          FlutterError(
+            code: "transcode_failed",
+            message: "Unable to convert picked image to JPEG.",
+            details: nil
+          )
+        )
+      }
+    case "transcodeVideoToMp4":
+      guard let sourcePath = call.arguments as? String else {
+        result(
+          FlutterError(
+            code: "invalid_arguments",
+            message: "Expected source file path as String.",
+            details: nil
+          )
+        )
+        return
+      }
+      transcodeVideoToMp4(sourcePath: sourcePath, result: result)
+    case "generateVideoPoster":
+      guard let sourcePath = call.arguments as? String else {
+        result(
+          FlutterError(
+            code: "invalid_arguments",
+            message: "Expected source file path as String.",
+            details: nil
+          )
+        )
+        return
+      }
+      generateVideoPoster(sourcePath: sourcePath, result: result)
+    case "clipboardHasImage":
+      result(UIPasteboard.general.hasImages)
+    case "readClipboardImage":
+      guard let imageData = Self.clipboardImageData(from: UIPasteboard.general) else {
+        result(nil)
+        return
+      }
+      result(FlutterStandardTypedData(bytes: imageData))
+    default:
+      result(FlutterMethodNotImplemented)
+    }
+  }
+
+  static func clipboardImageData(from pasteboard: UIPasteboard) -> Data? {
+    if let pngData = pasteboard.data(forPasteboardType: "public.png") {
+      return pngData
+    }
+    if let jpegData = pasteboard.data(forPasteboardType: "public.jpeg") {
+      return jpegData
+    }
+    for imageType in ["public.heic", "public.heif", "org.webmproject.webp", "com.compuserve.gif"] {
+      if let imageData = pasteboard.data(forPasteboardType: imageType) {
+        return imageData
+      }
+    }
+    guard let image = pasteboard.image else {
+      return nil
+    }
+    return image.pngData()
+  }
+
+  private func transcodeVideoToMp4(
+    sourcePath: String,
+    result: @escaping FlutterResult
+  ) {
+    let sourceURL = URL(fileURLWithPath: sourcePath)
+    let asset = AVURLAsset(url: sourceURL)
+
+    // Do not export the source asset directly. An iPhone video can carry GPS,
+    // spatial-video, and other data tracks even when its user-visible metadata
+    // is cleared. A fresh composition copies only one video and one audio
+    // track, so those private channels cannot reach the relay.
+    let composition = AVMutableComposition()
+    guard
+      let sourceVideo = asset.tracks(withMediaType: .video).first,
+      let destinationVideo = composition.addMutableTrack(
+        withMediaType: .video,
+        preferredTrackID: kCMPersistentTrackID_Invalid
+      )
+    else {
+      result(
+        FlutterError(
+          code: "transcode_failed",
+          message: "The selected file does not contain a video track.",
+          details: nil
+        )
+      )
+      return
+    }
+
+    do {
+      let sourceAudio = asset.tracks(withMediaType: .audio).first
+      let insertionTimes = Self.relativeTrackInsertionTimes(
+        videoStart: sourceVideo.timeRange.start,
+        audioStart: sourceAudio?.timeRange.start
+      )
+      try destinationVideo.insertTimeRange(
+        sourceVideo.timeRange,
+        of: sourceVideo,
+        at: insertionTimes.video
+      )
+      destinationVideo.preferredTransform = sourceVideo.preferredTransform
+
+      if
+        let sourceAudio,
+        let destinationAudio = composition.addMutableTrack(
+          withMediaType: .audio,
+          preferredTrackID: kCMPersistentTrackID_Invalid
+        )
+      {
+        try destinationAudio.insertTimeRange(
+          sourceAudio.timeRange,
+          of: sourceAudio,
+          at: insertionTimes.audio ?? .zero
+        )
+      }
+    } catch {
+      result(
+        FlutterError(
+          code: "transcode_failed",
+          message: error.localizedDescription,
+          details: nil
+        )
+      )
+      return
+    }
+
+    guard
+      let exportSession = AVAssetExportSession(
+        asset: composition,
+        // Passthrough preserves the source's HEVC codec and container
+        // metadata. Buzz accepts only canonical H.264/AAC MP4s with no
+        // metadata channels, so re-encode instead of copying the movie.
+        presetName: AVAssetExportPresetMediumQuality
+      )
+    else {
+      result(
+        FlutterError(
+          code: "transcode_failed",
+          message: "Unable to create export session.",
+          details: nil
+        )
+      )
+      return
+    }
+
+    let outputURL = FileManager.default.temporaryDirectory
+      .appendingPathComponent(UUID().uuidString)
+      .appendingPathExtension("mp4")
+
+    exportSession.outputURL = outputURL
+    exportSession.outputFileType = .mp4
+    exportSession.shouldOptimizeForNetworkUse = true
+    // `forSharing()` intentionally retains playback metadata. The relay
+    // rejects every descriptive metadata channel to avoid leaking location or
+    // other private information, so write no source metadata at all.
+    exportSession.metadata = []
+    exportSession.metadataItemFilter = nil
+
+    exportSession.exportAsynchronously {
+      switch exportSession.status {
+      case .completed:
+        do {
+          // AVFoundation writes a standard sample-dependency table (`sdtp`).
+          // Older Buzz relays mistook that playback-only box for metadata. Keep
+          // its size and payload in a `free` box so chunk offsets stay valid and
+          // uploads work before those relays receive the validator fix.
+          try Self.neutralizeSampleDependencyBoxes(at: outputURL)
+          result(outputURL.path)
+        } catch {
+          try? FileManager.default.removeItem(at: outputURL)
+          result(
+            FlutterError(
+              code: "transcode_failed",
+              message: "Unable to canonicalize transcoded video.",
+              details: error.localizedDescription
+            )
+          )
+        }
+      default:
+        let errorMessage =
+          exportSession.error?.localizedDescription
+          ?? "Video transcoding failed with status \(exportSession.status.rawValue)."
+        result(
+          FlutterError(
+            code: "transcode_failed",
+            message: errorMessage,
+            details: nil
+          )
+        )
+        // Clean up partial output on failure.
+        try? FileManager.default.removeItem(at: outputURL)
+      }
+    }
+  }
+
+  static func relativeTrackInsertionTimes(
+    videoStart: CMTime,
+    audioStart: CMTime?
+  ) -> (video: CMTime, audio: CMTime?) {
+    guard let audioStart else {
+      return (video: .zero, audio: nil)
+    }
+
+    let timelineStart =
+      CMTimeCompare(audioStart, videoStart) < 0 ? audioStart : videoStart
+    return (
+      video: CMTimeSubtract(videoStart, timelineStart),
+      audio: CMTimeSubtract(audioStart, timelineStart)
+    )
+  }
+
+  private func generateVideoPoster(
+    sourcePath: String,
+    result: @escaping FlutterResult
+  ) {
+    DispatchQueue.global(qos: .userInitiated).async {
+      let asset = AVURLAsset(url: URL(fileURLWithPath: sourcePath))
+      let generator = AVAssetImageGenerator(asset: asset)
+      generator.appliesPreferredTrackTransform = true
+      generator.maximumSize = CGSize(width: 720, height: 720)
+      generator.requestedTimeToleranceBefore = .positiveInfinity
+      generator.requestedTimeToleranceAfter = .positiveInfinity
+
+      do {
+        let durationSeconds = CMTimeGetSeconds(asset.duration)
+        let middleTime = durationSeconds.isFinite && durationSeconds > 0
+          ? min(durationSeconds / 2, 1)
+          : 0
+        let candidateTimes = [0, 0.1, middleTime]
+        var posterImage: CGImage?
+        var lastError: Error?
+
+        for seconds in candidateTimes {
+          do {
+            posterImage = try generator.copyCGImage(
+              at: CMTime(seconds: seconds, preferredTimescale: 600),
+              actualTime: nil
+            )
+            if posterImage != nil { break }
+          } catch {
+            lastError = error
+          }
+        }
+
+        guard let posterImage else {
+          throw lastError ?? NSError(
+            domain: "BuzzVideoPoster",
+            code: 1,
+            userInfo: [NSLocalizedDescriptionKey: "Unable to decode a video frame."]
+          )
+        }
+        guard let jpegData = try MediaSanitizer.encodeJpeg(UIImage(cgImage: posterImage)) else {
+          throw NSError(
+            domain: "BuzzVideoPoster",
+            code: 2,
+            userInfo: [NSLocalizedDescriptionKey: "Unable to encode video poster."]
+          )
+        }
+        DispatchQueue.main.async {
+          result(FlutterStandardTypedData(bytes: jpegData))
+        }
+      } catch {
+        DispatchQueue.main.async {
+          result(
+            FlutterError(
+              code: "poster_failed",
+              message: "Unable to create a video preview.",
+              details: error.localizedDescription
+            )
+          )
+        }
+      }
+    }
+  }
+
+  private static func neutralizeSampleDependencyBoxes(at url: URL) throws {
+    var data = try Data(contentsOf: url)
+    try neutralizeSampleDependencyBoxes(in: &data, start: 0, end: data.count)
+    try data.write(to: url, options: .atomic)
+  }
+
+  private static func neutralizeSampleDependencyBoxes(
+    in data: inout Data,
+    start: Int,
+    end: Int
+  ) throws {
+    let containers: Set<[UInt8]> = [
+      Array("moov".utf8), Array("trak".utf8), Array("mdia".utf8),
+      Array("minf".utf8), Array("stbl".utf8), Array("edts".utf8),
+      Array("dinf".utf8), Array("sinf".utf8), Array("schi".utf8),
+    ]
+    let sampleDependencyType = Array("sdtp".utf8)
+    let freeType = Array("free".utf8)
+    var offset = start
+
+    while offset < end {
+      guard end - offset >= 8 else { throw invalidMp4BoxError() }
+      let compactSize = Int(readBigEndianUInt32(data, at: offset))
+      var headerSize = 8
+      let boxSize: Int
+      if compactSize == 1 {
+        guard end - offset >= 16 else { throw invalidMp4BoxError() }
+        let extendedSize = readBigEndianUInt64(data, at: offset + 8)
+        guard extendedSize <= UInt64(Int.max) else { throw invalidMp4BoxError() }
+        boxSize = Int(extendedSize)
+        headerSize = 16
+      } else if compactSize == 0 {
+        boxSize = end - offset
+      } else {
+        boxSize = compactSize
+      }
+
+      guard boxSize >= headerSize, offset + boxSize <= end else {
+        throw invalidMp4BoxError()
+      }
+      let type = Array(data[(offset + 4)..<(offset + 8)])
+      if type == sampleDependencyType {
+        data.replaceSubrange((offset + 4)..<(offset + 8), with: freeType)
+      } else if containers.contains(type) {
+        try neutralizeSampleDependencyBoxes(
+          in: &data,
+          start: offset + headerSize,
+          end: offset + boxSize
+        )
+      }
+      offset += boxSize
+    }
+  }
+
+  private static func readBigEndianUInt32(_ data: Data, at offset: Int) -> UInt32 {
+    data[offset..<(offset + 4)].reduce(0) { ($0 << 8) | UInt32($1) }
+  }
+
+  private static func readBigEndianUInt64(_ data: Data, at offset: Int) -> UInt64 {
+    data[offset..<(offset + 8)].reduce(0) { ($0 << 8) | UInt64($1) }
+  }
+
+  private static func invalidMp4BoxError() -> NSError {
+    NSError(
+      domain: "BuzzVideoTranscode",
+      code: 1,
+      userInfo: [NSLocalizedDescriptionKey: "Invalid MP4 box structure."]
+    )
+  }
+}

mobile/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,122 @@
+{
+  "images" : [
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "83.5x83.5",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-83.5x83.5@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Icon-App-1024x1024@1x.png",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

mobile/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

mobile/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md

@@ -0,0 +1,5 @@
+# Launch Screen Assets
+
+You can customize the launch screen with your own desired assets by replacing the image files in this directory.
+
+You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images.

mobile/ios/Runner/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Ydg-fD-yQy"/>
+                        <viewControllerLayoutGuide type="bottom" id="xbc-2k-c8Z"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="0" green="0" blue="0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="168" height="168"/>
+    </resources>
+</document>

mobile/ios/Runner/Base.lproj/Main.storyboard

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

mobile/ios/Runner/ConcentricSheetSurface.swift

@@ -0,0 +1,54 @@
+import Flutter
+import UIKit
+
+final class ConcentricSheetSurfaceFactory: NSObject, FlutterPlatformViewFactory {
+  func createArgsCodec() -> FlutterMessageCodec & NSObjectProtocol {
+    FlutterStandardMessageCodec.sharedInstance()
+  }
+
+  func create(
+    withFrame frame: CGRect,
+    viewIdentifier viewId: Int64,
+    arguments args: Any?
+  ) -> FlutterPlatformView {
+    ConcentricSheetSurfacePlatformView(frame: frame, arguments: args)
+  }
+}
+
+final class ConcentricSheetSurfacePlatformView: NSObject, FlutterPlatformView {
+  private let surfaceView: UIView
+
+  init(frame: CGRect, arguments args: Any?) {
+    let arguments = args as? [String: Any]
+    let colorValue = (arguments?["color"] as? NSNumber)?.uint32Value ?? 0xFFFFFFFF
+    let minimumRadius = (arguments?["minimumRadius"] as? NSNumber)?.doubleValue ?? 24
+
+    surfaceView = UIView(frame: frame)
+    surfaceView.isOpaque = true
+    surfaceView.backgroundColor = Self.color(from: colorValue)
+    surfaceView.clipsToBounds = true
+    surfaceView.layer.cornerCurve = .continuous
+
+    if #available(iOS 26.0, *) {
+      surfaceView.cornerConfiguration = .uniformCorners(
+        radius: .containerConcentric(minimum: minimumRadius)
+      )
+    } else {
+      surfaceView.layer.cornerRadius = minimumRadius
+    }
+
+    super.init()
+  }
+
+  func view() -> UIView {
+    surfaceView
+  }
+
+  private static func color(from value: UInt32) -> UIColor {
+    let alpha = CGFloat((value >> 24) & 0xFF) / 255
+    let red = CGFloat((value >> 16) & 0xFF) / 255
+    let green = CGFloat((value >> 8) & 0xFF) / 255
+    let blue = CGFloat(value & 0xFF) / 255
+    return UIColor(red: red, green: green, blue: blue, alpha: alpha)
+  }
+}