fix(android): add channel password join action

apps/chanora_flutter/lib/main.dart

@@ -703,15 +703,17 @@ class _BetaHomeState extends State<_BetaHome> {
     }
   }
 
-  Future<void> _onJoinChannel(rust.BridgeChannel ch) async {
+  Future<void> _onJoinChannel(
+    rust.BridgeChannel ch, {
+    bool askForPassword = false,
+  }) async {
     if (!_canJoinVoiceChannel) return;
     if (_pendingVoiceChannelId != null) return;
     if (ch.id == _currentVoiceChannelId) return;
     final l10n = AppL10n.of(context);
     final messenger = ScaffoldMessenger.of(context);
     String? password;
-    // Heuristic: a channel name annotated with a lock prompts.
-    if (ch.name.contains('🔒') || ch.name.toLowerCase().contains('password')) {
+    if (askForPassword) {
       password = await _askChannelPassword(l10n);
       if (password == null) return; // cancelled
     }
@@ -1414,7 +1416,9 @@ class _BetaHomeState extends State<_BetaHome> {
                       pendingVoiceChannelId: _pendingVoiceChannelId,
                       hasJoinPending: _pendingVoiceChannelId != null,
                       canJoinVoiceChannel: _canJoinVoiceChannel,
-                      onJoinChannel: _onJoinChannel,
+                      onJoinChannel: (ch) => _onJoinChannel(ch),
+                      onJoinChannelWithPassword: (ch) =>
+                          _onJoinChannel(ch, askForPassword: true),
                     );
                     const voiceBarWidthWide = 320.0;
                     if (constraints.maxWidth >= wideBreakpoint) {
@@ -2057,6 +2061,7 @@ class _SnapshotView extends StatelessWidget {
     required this.hasJoinPending,
     required this.canJoinVoiceChannel,
     required this.onJoinChannel,
+    required this.onJoinChannelWithPassword,
   });
 
   final rust.BridgeSnapshot snapshot;
@@ -2065,6 +2070,7 @@ class _SnapshotView extends StatelessWidget {
   final bool hasJoinPending;
   final bool canJoinVoiceChannel;
   final ValueChanged<rust.BridgeChannel> onJoinChannel;
+  final ValueChanged<rust.BridgeChannel> onJoinChannelWithPassword;
 
   @override
   Widget build(BuildContext context) {
@@ -2143,19 +2149,31 @@ class _SnapshotView extends StatelessWidget {
               subtitle: Text('id=${ch.id}  parent=${ch.parent}'),
               trailing: ch.id == currentVoiceChannelId
                   ? null
-                  : IconButton(
-                      icon: Icon(
-                        ch.id == pendingVoiceChannelId
-                            ? Icons.hourglass_top
-                            : Icons.login,
-                      ),
-                      tooltip: ch.id == pendingVoiceChannelId
-                          ? l10n.statusConnecting
-                          : l10n.joinChannelAction,
-                      onPressed:
-                          hasJoinPending || ch.id == pendingVoiceChannelId
-                          ? null
-                          : () => onJoinChannel(ch),
+                  : Row(
+                      mainAxisSize: MainAxisSize.min,
+                      children: [
+                        IconButton(
+                          icon: const Icon(Icons.lock_outline),
+                          tooltip: l10n.channelPasswordTitle,
+                          onPressed: hasJoinPending
+                              ? null
+                              : () => onJoinChannelWithPassword(ch),
+                        ),
+                        IconButton(
+                          icon: Icon(
+                            ch.id == pendingVoiceChannelId
+                                ? Icons.hourglass_top
+                                : Icons.login,
+                          ),
+                          tooltip: ch.id == pendingVoiceChannelId
+                              ? l10n.statusConnecting
+                              : l10n.joinChannelAction,
+                          onPressed:
+                              hasJoinPending || ch.id == pendingVoiceChannelId
+                              ? null
+                              : () => onJoinChannel(ch),
+                        ),
+                      ],
                     ),
               selected: ch.id == currentVoiceChannelId,
               onTap: