feat: import Chinese-localized Buzz source snapshot

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

mobile/lib/features/pulse/pulse_models.dart

@@ -0,0 +1,139 @@
+import 'package:flutter/foundation.dart';
+
+import '../../shared/relay/nostr_models.dart';
+
+@immutable
+class UserNote {
+  final String id;
+  final String pubkey;
+  final int createdAt;
+  final String content;
+  final List<List<String>> tags;
+
+  const UserNote({
+    required this.id,
+    required this.pubkey,
+    required this.createdAt,
+    required this.content,
+    required this.tags,
+  });
+
+  factory UserNote.fromEvent(NostrEvent event) => UserNote(
+    id: event.id,
+    pubkey: event.pubkey.toLowerCase(),
+    createdAt: event.createdAt,
+    content: event.content,
+    tags: event.tags,
+  );
+
+  String? get replyParentId {
+    for (final tag in tags) {
+      if (tag.length >= 4 && tag[0] == 'e' && tag[3] == 'reply') return tag[1];
+    }
+    return null;
+  }
+
+  String? get replyParentAuthor {
+    for (final tag in tags) {
+      if (tag.length >= 2 && tag[0] == 'p') return tag[1].toLowerCase();
+    }
+    return null;
+  }
+
+  List<String> get mentionPubkeys => [
+    for (final tag in tags)
+      if (tag.length >= 2 && tag[0] == 'p') tag[1].toLowerCase(),
+  ];
+}
+
+@immutable
+class NoteReactionSummary {
+  final String noteId;
+  final String emoji;
+  final int count;
+  final List<String> pubkeys;
+  final Map<String, String> reactionIdsByPubkey;
+
+  const NoteReactionSummary({
+    required this.noteId,
+    required this.emoji,
+    required this.count,
+    required this.pubkeys,
+    this.reactionIdsByPubkey = const {},
+  });
+}
+
+@immutable
+class PulseReactionState {
+  final int count;
+  final bool reactedByCurrentUser;
+  final String? currentUserReactionId;
+
+  const PulseReactionState({
+    required this.count,
+    required this.reactedByCurrentUser,
+    this.currentUserReactionId,
+  });
+}
+
+@immutable
+class AgentNoteGroup {
+  final String pubkey;
+  final List<UserNote> notes;
+  final int latestAt;
+  final int earliestAt;
+
+  const AgentNoteGroup({
+    required this.pubkey,
+    required this.notes,
+    required this.latestAt,
+    required this.earliestAt,
+  });
+}
+
+List<AgentNoteGroup> groupAgentNotes(
+  List<UserNote> notes, {
+  int windowSeconds = 300,
+}) {
+  if (notes.isEmpty) return const [];
+
+  final groups = <AgentNoteGroup>[];
+  AgentNoteGroup? current;
+
+  for (final note in notes) {
+    final lastNote = current?.notes.last;
+    if (current != null &&
+        lastNote != null &&
+        current.pubkey == note.pubkey &&
+        lastNote.createdAt - note.createdAt <= windowSeconds) {
+      current = AgentNoteGroup(
+        pubkey: current.pubkey,
+        notes: [...current.notes, note],
+        latestAt: current.latestAt,
+        earliestAt: note.createdAt,
+      );
+    } else {
+      if (current != null) groups.add(current);
+      current = AgentNoteGroup(
+        pubkey: note.pubkey,
+        notes: [note],
+        latestAt: note.createdAt,
+        earliestAt: note.createdAt,
+      );
+    }
+  }
+
+  if (current != null) groups.add(current);
+  return groups;
+}
+
+@immutable
+class ContactEntry {
+  final String pubkey;
+  final String? relayUrl;
+  final String? petname;
+
+  const ContactEntry({required this.pubkey, this.relayUrl, this.petname});
+
+  List<String> toTag() => ['p', pubkey.toLowerCase(), ?relayUrl, ?petname];
+}