chore: accessibility improvements, Semantics wrappers, and tooltip additions across screens

lib/widgets/collapsing_header.dart

@@ -32,6 +32,7 @@ class CollapsingHeader extends StatelessWidget {
           surfaceTintColor: Colors.transparent,
           leading: showBackButton
               ? IconButton(
+                  tooltip: MaterialLocalizations.of(context).backButtonTooltip,
                   icon: const Icon(Icons.arrow_back),
                   onPressed: () => Navigator.pop(context),
                 )
@@ -39,7 +40,10 @@ class CollapsingHeader extends StatelessWidget {
           automaticallyImplyLeading: false,
           flexibleSpace: LayoutBuilder(
             builder: (context, constraints) {
-              final expandRatio = _calculateExpandRatio(constraints, topPadding);
+              final expandRatio = _calculateExpandRatio(
+                constraints,
+                topPadding,
+              );
               final animation = AlwaysStoppedAnimation(expandRatio);
 
               return FlexibleSpaceBar(
@@ -48,13 +52,22 @@ class CollapsingHeader extends StatelessWidget {
                 title: Container(
                   alignment: Alignment.bottomLeft,
                   padding: EdgeInsets.only(
-                    left: Tween<double>(begin: showBackButton ? 56 : 24, end: 24).evaluate(animation),
-                    bottom: Tween<double>(begin: 16, end: 24).evaluate(animation),
+                    left: Tween<double>(
+                      begin: showBackButton ? 56 : 24,
+                      end: 24,
+                    ).evaluate(animation),
+                    bottom: Tween<double>(
+                      begin: 16,
+                      end: 24,
+                    ).evaluate(animation),
                   ),
                   child: Text(
                     title,
                     style: TextStyle(
-                      fontSize: Tween<double>(begin: 20, end: 28).evaluate(animation),
+                      fontSize: Tween<double>(
+                        begin: 20,
+                        end: 28,
+                      ).evaluate(animation),
                       fontWeight: FontWeight.bold,
                       color: colorScheme.onSurface,
                     ),
@@ -142,8 +155,12 @@ class InfoCard extends StatelessWidget {
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
                   Text(title, style: Theme.of(context).textTheme.bodyLarge),
-                  Text(subtitle, style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                    color: colorScheme.onSurfaceVariant)),
+                  Text(
+                    subtitle,
+                    style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                      color: colorScheme.onSurfaceVariant,
+                    ),
+                  ),
                 ],
               ),
             ],

lib/widgets/priority_settings_scaffold.dart

@@ -61,6 +61,7 @@ class PrioritySettingsScaffold extends StatelessWidget {
               backgroundColor: colorScheme.surface,
               surfaceTintColor: Colors.transparent,
               leading: IconButton(
+                tooltip: MaterialLocalizations.of(context).backButtonTooltip,
                 icon: const Icon(Icons.arrow_back),
                 onPressed: () => _handleBack(context),
               ),

lib/widgets/track_collection_quick_actions.dart

@@ -36,6 +36,7 @@ class TrackCollectionQuickActions extends ConsumerWidget {
     final colorScheme = Theme.of(context).colorScheme;
 
     return IconButton(
+      tooltip: MaterialLocalizations.of(context).showMenuTooltip,
       icon: Icon(
         Icons.more_vert,
         color: colorScheme.onSurfaceVariant,