feat(theme): complete redesign to Cyber-Cinematic Glass (Stitch)

Replace the legacy Apple TV-style purple/cyan theme with the full
Google Stitch Cyber-Cinematic Glass design system across the
entire app (desktop + mobile).

- New Material 3 dark ColorScheme: background #121317, primary
  #adc6ff, primaryContainer #4b8eff, surface containers, etc.
- Typography: Space Grotesk (headlines) + Inter (body/labels)
- 3-level glassmorphism via GlassContainer: base, glass, floating
- Primary gradient: #007AFF → #00C6FF with blue glow effects
- Removed old compatibility aliases (focusColor, border, textPrimary,
  textSecondary); all code now uses semantic Stitch tokens
- Systematically replaced all Colors.white/black/red/grey and
  GoogleFonts.roboto/outfit with Stitch equivalents
- All 36 lib/ files updated, zero compilation errors

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

lib/features/iptv/widgets/clock_widget.dart

@@ -1,5 +1,6 @@
 import 'dart:async';
 import 'package:flutter/material.dart';
+import '../../../core/theme/app_colors.dart';
 import 'package:intl/intl.dart';
 
 class ClockWidget extends StatefulWidget {
@@ -45,10 +46,10 @@ class _ClockWidgetState extends State<ClockWidget> {
     return Text(
       timeString,
       style: widget.style ?? const TextStyle(
-        color: Colors.white, 
+        color: AppColors.onSurface, 
         fontSize: 16, 
         fontWeight: FontWeight.bold,
-        shadows: [Shadow(color: Colors.black, blurRadius: 4)],
+        shadows: [Shadow(color: AppColors.background, blurRadius: 4)],
       ),
     );
   }