fix(ui): refine track action spacing

lib/widgets/track_card.dart

@@ -77,6 +77,9 @@ class TrackCard extends StatelessWidget {
     final theme = Theme.of(context);
     final colorScheme = theme.colorScheme;
     final borderRadius = tokens.borderRadiusCover;
+    final contentPadding = style == TrackCardStyle.flat
+        ? EdgeInsets.fromLTRB(tokens.gapMd, tokens.gapMd, 6, tokens.gapMd)
+        : EdgeInsets.all(tokens.gapMd);
 
     final Color? cardColor;
     if (isSelected) {
@@ -111,7 +114,7 @@ class TrackCard extends StatelessWidget {
           children: [
             if (background != null) Positioned.fill(child: background!),
             Padding(
-              padding: EdgeInsets.all(tokens.gapMd),
+              padding: contentPadding,
               child: Row(
                 children: [
                   if (isSelectionMode) ...[

lib/widgets/track_collection_quick_actions.dart

@@ -59,7 +59,7 @@ class TrackCollectionQuickActions extends ConsumerWidget {
         track,
         hasLocalPlaybackCandidate: hasLocalPlaybackCandidate,
       ),
-      padding: const EdgeInsets.only(left: 12),
+      padding: EdgeInsets.zero,
       constraints: const BoxConstraints(minWidth: 48, minHeight: 48),
     );
   }