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/features/iptv/services/subtitle_service.dart

@@ -170,7 +170,7 @@ class SubtitleService {
     final minutes = int.parse(parts[1]);
     final secondsParts = parts[2].split('.');
     final seconds = int.parse(secondsParts[0]);
-    final milliseconds = int.parse(secondsParts[1].padEnd(3, '0'));
+    final milliseconds = int.parse(secondsParts[1].padRight(3, '0'));
 
     return Duration(
       hours: hours,

lib/features/iptv/widgets/live_tv_tab.dart

@@ -99,9 +99,8 @@ class _LiveTVTabState extends ConsumerState<LiveTVTab>
               // HEADER (Glass)
               Padding(
                 padding: const EdgeInsets.fromLTRB(24, 16, 24, 16),
-                child: GlassContainer(
+                child: GlassContainer.glass(
                   borderRadius: 16,
-                  opacity: 0.6,
                   padding:
                       const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
                   child: Row(
@@ -288,9 +287,8 @@ class _LiveTVTabState extends ConsumerState<LiveTVTab>
             });
           },
           borderRadius: 16,
-          child: GlassContainer(
+          child: GlassContainer.base(
             borderRadius: 16,
-            opacity: 0.2, // Darker glass
             padding: const EdgeInsets.all(0),
             child: Stack(
               children: [