feat: import Chinese-localized Buzz source snapshot

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

mobile/lib/shared/deeplink/pending_deep_link_provider.dart

@@ -0,0 +1,52 @@
+import 'dart:async';
+
+import 'package:app_links/app_links.dart';
+import 'package:flutter/foundation.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+import 'deep_link.dart';
+
+/// Holds the most recent supported deep link that has not been
+/// dispatched yet.
+///
+/// Listens to [AppLinks.uriLinkStream], which delivers both the cold-start
+/// link (the URL that launched the app) and links received while running.
+/// Navigation cannot always happen the moment a link arrives — the user may
+/// not be authenticated yet, or channels may still be loading — so the parsed
+/// link is parked here and consumed by the dispatcher once the app is ready.
+class PendingDeepLinkNotifier extends Notifier<BuzzDeepLink?> {
+  @visibleForTesting
+  static Stream<Uri>? debugUriStreamOverride;
+
+  StreamSubscription<Uri>? _subscription;
+
+  @override
+  BuzzDeepLink? build() {
+    final stream = debugUriStreamOverride ?? AppLinks().uriLinkStream;
+    _subscription = stream.listen(handleUri);
+    ref.onDispose(() {
+      _subscription?.cancel();
+      _subscription = null;
+    });
+    return null;
+  }
+
+  /// Parse and park an incoming URI. Unsupported links are ignored loudly.
+  @visibleForTesting
+  void handleUri(Uri uri) {
+    final link = parseBuzzDeepLink(uri);
+    if (link == null) {
+      debugPrint('deep-link: ignoring unsupported link: $uri');
+      return;
+    }
+    state = link;
+  }
+
+  /// Clear the pending link after it has been dispatched (or dropped).
+  void consume() => state = null;
+}
+
+final pendingDeepLinkProvider =
+    NotifierProvider<PendingDeepLinkNotifier, BuzzDeepLink?>(
+      PendingDeepLinkNotifier.new,
+    );