feat(tray): add trayIcon field for dynamic icon updates

Added trayIcon field to PluginOutput (crossbar_core) allowing plugins
to dynamically specify Freedesktop icon names (e.g., battery-level-50-symbolic).

Changes:
- Added trayIcon?: String to PluginOutput constructor, copyWith, toJson
- Propagated trayIcon from TrayService → ProcessSpawnBackend → daemon
- Fixed duplicate menu items (Refresh/Show/Quit appeared 2x)
  - Removed standard actions from daemon since TrayService's _buildPluginMenu already adds them

Plugins can now change tray icons based on state:
- battery plugin: battery-level-10-symbolic → battery-level-100-symbolic
- If trayIcon is null, falls back to pluginId-based mapping

Author: insign

bin/crossbar_tray_daemon.dart

@@ -125,20 +125,8 @@ Future<void> _processMessage(Map<String, dynamic> data) async {
     }
   }
 
-  // Add standard actions
-  menuItems.add(DBusMenuItem.separator());
-  menuItems.add(DBusMenuItem(
-    label: 'Show Crossbar',
-    onClicked: () async {
-      stdout.writeln(jsonEncode({'action': 'show'}));
-    },
-  ));
-  menuItems.add(DBusMenuItem(
-    label: 'Quit',
-    onClicked: () async {
-      stdout.writeln(jsonEncode({'action': 'quit'}));
-    },
-  ));
+  // Note: Standard actions (Refresh, Show, Quit) are added by TrayService's
+  // _buildPluginMenu, so we don't add them here to avoid duplicates.
 
   final menu = DBusMenuItem(children: menuItems);
 

lib/services/tray_service.dart

@@ -315,14 +315,17 @@ class TrayService with TrayListener {
 
     final existingIconId = _pluginIconIds[pluginId];
     final title = '${output.icon} ${output.text ?? ''}';
+    // Use plugin's trayIcon if provided, otherwise null (daemon will use mapping)
+    final iconName = output.trayIcon;
 
-    LoggerService().info('TrayService._updateSeparateIcon: pluginId=$pluginId, existingIconId=$existingIconId, totalIcons=${_pluginIconIds.length}');
+    LoggerService().info('TrayService._updateSeparateIcon: pluginId=$pluginId, existingIconId=$existingIconId, trayIcon=$iconName');
 
     if (existingIconId != null) {
       // Update existing icon
       LoggerService().info('TrayService._updateSeparateIcon: updating existing icon $existingIconId');
       await _backend!.updateIcon(
         iconId: existingIconId,
+        iconPath: iconName,
         title: title,
         tooltip: output.text ?? pluginId,
         menu: _buildPluginMenu(pluginId, output),
@@ -332,7 +335,7 @@ class TrayService with TrayListener {
       LoggerService().info('TrayService._updateSeparateIcon: creating new icon for $pluginId');
       final iconId = await _backend!.createIcon(
         pluginId: pluginId,
-        iconPath: _iconPath ?? 'applications-utilities',
+        iconPath: iconName ?? 'applications-utilities',
         tooltip: title,
       );
 
@@ -343,6 +346,7 @@ class TrayService with TrayListener {
         // Update with full menu immediately
         await _backend!.updateIcon(
           iconId: iconId,
+          iconPath: iconName,
           title: title,
           menu: _buildPluginMenu(pluginId, output),
         );

packages/crossbar_core/lib/src/models/plugin_output.dart

@@ -6,6 +6,7 @@ class PluginOutput {
     this.text,
     this.color,
     this.trayTooltip,
+    this.trayIcon,
     this.menu = const [],
     this.hasError = false,
     this.errorMessage,
@@ -33,6 +34,9 @@ class PluginOutput {
   final String? text;
   final int? color;
   final String? trayTooltip;
+  /// Freedesktop icon name for tray (e.g., 'battery-level-50-symbolic').
+  /// If null, falls back to icon name mapping based on pluginId.
+  final String? trayIcon;
   final List<MenuItem> menu;
   final bool hasError;
   final String? errorMessage;
@@ -43,6 +47,7 @@ class PluginOutput {
     String? text,
     int? color,
     String? trayTooltip,
+    String? trayIcon,
     List<MenuItem>? menu,
     bool? hasError,
     String? errorMessage,
@@ -53,6 +58,7 @@ class PluginOutput {
       text: text ?? this.text,
       color: color ?? this.color,
       trayTooltip: trayTooltip ?? this.trayTooltip,
+      trayIcon: trayIcon ?? this.trayIcon,
       menu: menu ?? this.menu,
       hasError: hasError ?? this.hasError,
       errorMessage: errorMessage ?? this.errorMessage,
@@ -66,6 +72,7 @@ class PluginOutput {
       'text': text,
       'color': color,
       'trayTooltip': trayTooltip,
+      'trayIcon': trayIcon,
       'menu': menu.map((m) => m.toJson()).toList(),
       'hasError': hasError,
       'errorMessage': errorMessage,