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/auth/screens/login_screen.dart

@@ -163,11 +163,10 @@ class _LoginScreenState extends ConsumerState<LoginScreen> {
                   const SizedBox(height: 48),
 
                   // Login Form Container
-                  GlassContainer(
+                  GlassContainer.floating(
                     width: 500,
                     padding: const EdgeInsets.all(48), // Spacious padding
                     borderRadius: 24,
-                    opacity: 0.7,
                     child: Form(
                       key: _formKey,
                       child: Column(
@@ -332,7 +331,7 @@ class _LoginScreenState extends ConsumerState<LoginScreen> {
         ),
         focusedBorder: OutlineInputBorder(
           borderRadius: BorderRadius.circular(12),
-          borderSide: const BorderSide(color: AppColors.focusColor, width: 2),
+          borderSide: BorderSide(color: AppColors.focusColor, width: 2),
         ),
         contentPadding:
             const EdgeInsets.symmetric(horizontal: 20, vertical: 20),