feat(design): Warm Cinema redesign + fast-start players

Full visual overhaul from Cyber-Cinematic Glass to "Warm Cinema":
warm charcoal (#0B0908), cream (#F3E9DF), ember (#D9541F).
Fraunces (editorial serif) for display, Karla for body/UI.

Design
- app_colors: new palette, all existing token names preserved,
  plus posterScrim/heroScrim gradients and lift()/emberFocus() shadows
- app_theme: new type scale, tighter radii, 20+ component themes
- mobile_theme aligned on the same tokens
- glass_container: opaque layered surfaces replace glassmorphism;
  adds GlassCard (hover + remote-focus states) and CinemaBackdrop
- players and boot splash restyled (film-leader motif, no web fonts)

Performance
- remove every BackdropFilter (33 call sites): backdrop blur forced a
  full framebuffer read per frame per card, the main scroll jank source
- bundle Fraunces/Karla as assets: google_fonts no longer fetches from
  fonts.gstatic.com at startup
- drop the blocking hls.js CDN script from index.html; no Dart code
  ever used it, only the player iframes need it
- self-host hls.js/mpegts.js and load them on demand, so ~213 KB of
  mpegts is never downloaded for HLS streams
- bound image decode size on 10 sites: a 40-poster grid drops from
  ~240 MB to a few tens of MB of GPU memory

Players (new shared engine: web/xf-player-core.js)
- event-driven start instead of a 200 ms buffer poll plus a 1.5 s wait
- initialLiveManifestSize 3 -> 1, liveSyncDurationCount 10 -> 2,
  startFragPrefetch on, testBandwidth off
- MPEG-TS initial stash 512 KB -> 64 KB
- adaptive escalation fast -> balanced -> safe on repeated stalls
  (60 s rolling window), applied live for HLS so there is no visible cut

Pre-existing build breakage fixed along the way
- undefined AppColors.shimmer, AppTheme.durationXs and spacing8/12/16/32
- broken relative imports in channel_card and quality_selector_widget
- missing GlassCard widget and hasBorder/showShadow parameters

Also resolves a leftover unmerged .claude/settings.local.json by
keeping the remote version.

Still broken (pre-existing, dead code, not reachable from main.dart):
recommendations_provider.dart and continue_watching_widget.dart import
a models/playlist.dart that no longer exists.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

lib/features/iptv/widgets/quality_selector_widget.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import '../../core/services/adaptive_bitrate_service.dart';
+import '../../../core/services/adaptive_bitrate_service.dart';
+import '../../../core/theme/app_colors.dart';
 
 /// Widget for displaying and selecting video quality during playback
 class QualitySelectorWidget extends ConsumerStatefulWidget {
@@ -35,7 +36,7 @@ class _QualitySelectorWidgetState extends ConsumerState<QualitySelectorWidget> {
     final bandwidthMbps = widget.qualitySelector.getEstimatedBandwidthMbps();
 
     return Dialog(
-      backgroundColor: Colors.black87,
+      backgroundColor: AppColors.surfaceContainer,
       insetPadding: const EdgeInsets.all(16),
       child: Column(
         mainAxisSize: MainAxisSize.min,
@@ -45,7 +46,7 @@ class _QualitySelectorWidgetState extends ConsumerState<QualitySelectorWidget> {
             padding: const EdgeInsets.all(16),
             decoration: const BoxDecoration(
               border: Border(
-                bottom: BorderSide(color: Colors.white24),
+                bottom: BorderSide(color: AppColors.onSurface24),
               ),
             ),
             child: Row(
@@ -54,13 +55,13 @@ class _QualitySelectorWidgetState extends ConsumerState<QualitySelectorWidget> {
                 const Text(
                   'Video Quality',
                   style: TextStyle(
-                    color: Colors.white,
+                    color: AppColors.onSurface,
                     fontSize: 18,
                     fontWeight: FontWeight.bold,
                   ),
                 ),
                 IconButton(
-                  icon: const Icon(Icons.close, color: Colors.white),
+                  icon: const Icon(Icons.close, color: AppColors.onSurface),
                   onPressed: widget.onClose,
                 ),
               ],
@@ -73,7 +74,7 @@ class _QualitySelectorWidgetState extends ConsumerState<QualitySelectorWidget> {
             child: Container(
               padding: const EdgeInsets.all(12),
               decoration: BoxDecoration(
-                color: Colors.white10,
+                color: AppColors.onSurface06,
                 borderRadius: BorderRadius.circular(8),
               ),
               child: Row(
@@ -81,12 +82,12 @@ class _QualitySelectorWidgetState extends ConsumerState<QualitySelectorWidget> {
                 children: [
                   const Text(
                     'Current Bandwidth:',
-                    style: TextStyle(color: Colors.white70, fontSize: 14),
+                    style: TextStyle(color: AppColors.onSurfaceVariant, fontSize: 14),
                   ),
                   Text(
                     '${bandwidthMbps.toStringAsFixed(1)} Mbps',
                     style: const TextStyle(
-                      color: Colors.white,
+                      color: AppColors.onSurface,
                       fontSize: 14,
                       fontWeight: FontWeight.bold,
                     ),
@@ -108,22 +109,22 @@ class _QualitySelectorWidgetState extends ConsumerState<QualitySelectorWidget> {
                 contentPadding:
                     const EdgeInsets.symmetric(horizontal: 24, vertical: 8),
                 leading: isSelected
-                    ? const Icon(Icons.check_circle, color: Colors.blue)
+                    ? const Icon(Icons.check_circle, color: AppColors.primary)
                     : const Icon(
                         Icons.radio_button_unchecked,
-                        color: Colors.white30,
+                        color: AppColors.onSurface24,
                       ),
                 title: Text(
                   quality.label,
                   style: TextStyle(
-                    color: isSelected ? Colors.blue : Colors.white,
+                    color: isSelected ? AppColors.primary : AppColors.onSurface,
                     fontWeight:
                         isSelected ? FontWeight.bold : FontWeight.normal,
                   ),
                 ),
                 subtitle: Text(
                   '${quality.bitrateBps ~/ 1000000} Mbps',
-                  style: const TextStyle(color: Colors.white70, fontSize: 12),
+                  style: const TextStyle(color: AppColors.onSurfaceVariant, fontSize: 12),
                 ),
                 onTap: () {
                   widget.qualitySelector.setQuality(quality);
@@ -141,7 +142,7 @@ class _QualitySelectorWidgetState extends ConsumerState<QualitySelectorWidget> {
             child: Container(
               decoration: const BoxDecoration(
                 border: Border(
-                  top: BorderSide(color: Colors.white24),
+                  top: BorderSide(color: AppColors.onSurface24),
                 ),
               ),
               child: ListTile(
@@ -157,7 +158,7 @@ class _QualitySelectorWidgetState extends ConsumerState<QualitySelectorWidget> {
                 ),
                 subtitle: const Text(
                   'Adjusts based on network speed',
-                  style: TextStyle(color: Colors.white70, fontSize: 12),
+                  style: TextStyle(color: AppColors.onSurfaceVariant, fontSize: 12),
                 ),
                 onTap: () {
                   // Auto mode would be handled by the player
@@ -194,18 +195,18 @@ class QualityIndicator extends ConsumerWidget {
       child: Container(
         padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
         decoration: BoxDecoration(
-          color: Colors.black54,
+          color: AppColors.baseLevel0,
           borderRadius: BorderRadius.circular(4),
         ),
         child: Row(
           mainAxisSize: MainAxisSize.min,
           children: [
-            const Icon(Icons.high_quality, color: Colors.white, size: 16),
+            const Icon(Icons.high_quality, color: AppColors.onSurface, size: 16),
             const SizedBox(width: 4),
             Text(
               quality.resolution.split('x')[1], // Show just the height
               style: const TextStyle(
-                color: Colors.white,
+                color: AppColors.onSurface,
                 fontSize: 12,
                 fontWeight: FontWeight.bold,
               ),
@@ -231,7 +232,7 @@ class BandwidthMonitor extends ConsumerWidget {
     return Container(
       padding: const EdgeInsets.all(8),
       decoration: BoxDecoration(
-        color: Colors.black54,
+        color: AppColors.baseLevel0,
         borderRadius: BorderRadius.circular(4),
       ),
       child: Row(
@@ -242,7 +243,7 @@ class BandwidthMonitor extends ConsumerWidget {
           Text(
             '${qualitySelector.getEstimatedBandwidthMbps().toStringAsFixed(1)} Mbps',
             style: const TextStyle(
-              color: Colors.white,
+              color: AppColors.onSurface,
               fontSize: 11,
             ),
           ),