feat(flutter): TrackRow renders TrackActionsButton by default

Adds optional actions: bool = true param. When true (default), renders
the 3-dot menu trigger at the end of the row. Album detail / Search /
History / Liked tabs all consume TrackRow so they pick up the menu
transitively.

Pair with c8baaa5 which wired the button into the other 3 surfaces;
this commit completes the wire-up by including TrackRow itself (its
write was missed in the previous commit).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

flutter_client/lib/library/widgets/track_row.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 
 import '../../models/track.dart';
+import '../../shared/widgets/track_actions/track_actions_button.dart';
 import '../../theme/theme_extension.dart';
 
 class TrackRow extends StatelessWidget {
@@ -8,12 +9,18 @@ class TrackRow extends StatelessWidget {
     required this.track,
     required this.onTap,
     this.trailing,
+    this.actions = true,
     super.key,
   });
   final TrackRef track;
   final VoidCallback onTap;
   final Widget? trailing;
 
+  /// Render the 3-dot TrackActionsButton at the end of the row. Default
+  /// true; pass false in surfaces that don't want the menu (e.g. when
+  /// showing a static read-only list).
+  final bool actions;
+
   @override
   Widget build(BuildContext context) {
     final fs = Theme.of(context).extension<FabledSwordTheme>()!;
@@ -54,6 +61,7 @@ class TrackRow extends StatelessWidget {
               padding: const EdgeInsets.only(left: 8),
               child: trailing!,
             ),
+          if (actions) TrackActionsButton(track: track),
         ]),
       ),
     );