feat: import Chinese-localized Buzz source snapshot

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

mobile/lib/features/pulse/pulse_actions.dart

@@ -0,0 +1,105 @@
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+import '../../shared/relay/relay.dart';
+import '../channels/channel_management_provider.dart';
+import '../../shared/custom_emoji/custom_emoji.dart';
+import '../../shared/custom_emoji/custom_emoji_provider.dart';
+import 'pulse_models.dart';
+import 'pulse_provider.dart';
+
+Future<void> publishNote(
+  WidgetRef ref, {
+  required String content,
+  UserNote? replyTo,
+  List<String> mentionPubkeys = const [],
+  List<List<String>> mediaTags = const [],
+}) async {
+  final text = content.trim();
+  if (text.isEmpty) return;
+
+  final config = ref.read(relayConfigProvider);
+  final session = ref.read(relaySessionProvider.notifier);
+  final relay = SignedEventRelay(session: session, nsec: config.nsec);
+  final tags = <List<String>>[];
+  final seen = <String>{};
+
+  if (replyTo != null) {
+    tags.add(['e', replyTo.id, '', 'reply']);
+    seen.add(replyTo.pubkey.toLowerCase());
+    tags.add(['p', replyTo.pubkey.toLowerCase()]);
+  }
+
+  for (final pubkey in mentionPubkeys) {
+    final normalized = pubkey.toLowerCase();
+    if (seen.add(normalized)) tags.add(['p', normalized]);
+  }
+  tags.addAll(mediaTags);
+  tags.addAll(buildCustomEmojiTags(text, ref.read(customEmojiListProvider)));
+
+  await relay.submit(kind: EventKind.note, content: text, tags: tags);
+  ref.invalidate(globalNotesProvider);
+  ref.invalidate(likedNotesProvider);
+}
+
+Future<void> toggleNoteUpvote(
+  WidgetRef ref, {
+  required String noteId,
+  required bool isUpvoted,
+  String? reactionEventId,
+}) async {
+  final actions = ref.read(channelActionsProvider);
+  if (isUpvoted) {
+    if (reactionEventId != null) {
+      await actions.removeReaction(reactionEventId, '+');
+    }
+  } else {
+    await actions.addReaction(noteId, '+');
+  }
+  ref.invalidate(likedNotesProvider);
+}
+
+Future<void> setContactList(WidgetRef ref, List<ContactEntry> contacts) async {
+  final currentPubkey = ref.read(myPubkeyProvider);
+  if (currentPubkey == null) return;
+  final config = ref.read(relayConfigProvider);
+  final session = ref.read(relaySessionProvider.notifier);
+  final relay = SignedEventRelay(session: session, nsec: config.nsec);
+
+  await relay.submit(
+    kind: EventKind.contactList,
+    content: '',
+    tags: contacts.map((entry) => entry.toTag()).toList(),
+  );
+  ref.invalidate(contactListProvider(currentPubkey));
+}
+
+Future<void> followUser(WidgetRef ref, String pubkey) async {
+  final currentPubkey = ref.read(myPubkeyProvider);
+  if (currentPubkey == null) return;
+  final contacts = await _fetchFreshContacts(ref, currentPubkey);
+  final normalized = pubkey.toLowerCase();
+  if (contacts.any((entry) => entry.pubkey == normalized)) return;
+  await setContactList(ref, [...contacts, ContactEntry(pubkey: normalized)]);
+}
+
+Future<void> unfollowUser(WidgetRef ref, String pubkey) async {
+  final currentPubkey = ref.read(myPubkeyProvider);
+  if (currentPubkey == null) return;
+  final normalized = pubkey.toLowerCase();
+  final contacts = await _fetchFreshContacts(ref, currentPubkey);
+  await setContactList(
+    ref,
+    contacts.where((entry) => entry.pubkey != normalized).toList(),
+  );
+}
+
+Future<List<ContactEntry>> _fetchFreshContacts(
+  WidgetRef ref,
+  String currentPubkey,
+) async {
+  final session = ref.read(relaySessionProvider.notifier);
+  final events = await session.fetchHistory(
+    NostrFilters.contactList(currentPubkey),
+  );
+  return contactsFromEvents(events);
+}