fix: resolve all compile errors from Stitch theme merge

- Add missing AppTheme animation constants (durationSm/Md/Lg/Xl, curveSmooth)
  to satisfy remote widget references.
- Replace deprecated GlassContainer(opacity:) with .glass()/.floating()/.base()
  in login_screen, live_tv_tab, mobile_live_tv_tab, player_screen,
  dashboard_screen.
- Fix const-eval errors by removing const from BorderSide/Text/BoxDecoration
  using AppColors.focusColor and AppColors.border (runtime getters).
- Fix subtitle_service.dart: padEnd → padRight (Dart String API).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

lib/mobile/widgets/mobile_scaffold.dart

@@ -42,7 +42,7 @@ class MobileScaffold extends ConsumerWidget {
         ],
       ),
       bottomNavigationBar: Container(
-        decoration: const BoxDecoration(
+        decoration: BoxDecoration(
           color: AppColors.surface,
           border: Border(
             top: BorderSide(