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/streaming_settings_tab.dart

@@ -19,7 +19,7 @@ class StreamingSettingsTab extends ConsumerWidget {
         // Header
         Text(
           'Paramètres Streaming Live TV',
-          style: GoogleFonts.inter(
+          style: GoogleFonts.karla(
             fontSize: 18,
             fontWeight: FontWeight.bold,
             color: AppColors.onSurface,
@@ -28,7 +28,7 @@ class StreamingSettingsTab extends ConsumerWidget {
         const SizedBox(height: 8),
         Text(
           'Ces paramètres s\'appliquent uniquement aux flux TV en direct.',
-          style: GoogleFonts.inter(
+          style: GoogleFonts.karla(
             fontSize: 12,
             color: AppColors.onSurfaceVariant,
           ),
@@ -101,18 +101,18 @@ class StreamingSettingsTab extends ConsumerWidget {
                 ConnectionTimeout.long => 'Long (60s)',
               },
             ),
-            Divider(height: 1, color: Colors.white.withOpacity(0.1)),
+            Divider(height: 1, color: AppColors.onSurface.withOpacity(0.1)),
             SwitchListTile(
               title: Text(
                 'Reconnexion automatique',
-                style: GoogleFonts.inter(fontSize: 14, color: AppColors.onSurface),
+                style: GoogleFonts.karla(fontSize: 14, color: AppColors.onSurface),
               ),
               subtitle: Text(
                 'Se reconnecter en cas de coupure',
-                style: GoogleFonts.inter(fontSize: 12, color: AppColors.onSurfaceVariant),
+                style: GoogleFonts.karla(fontSize: 12, color: AppColors.onSurfaceVariant),
               ),
               value: settings.autoReconnect,
-              activeThumbColor: Colors.blueAccent,
+              activeThumbColor: AppColors.primary,
               onChanged: (v) => notifier.setAutoReconnect(v),
             ),
           ],
@@ -137,18 +137,18 @@ class StreamingSettingsTab extends ConsumerWidget {
                 TranscodingMode.disabled => 'Désactivé (direct)',
               },
             ),
-            Divider(height: 1, color: Colors.white.withOpacity(0.1)),
+            Divider(height: 1, color: AppColors.onSurface.withOpacity(0.1)),
             SwitchListTile(
               title: Text(
                 'Préférer lecture directe',
-                style: GoogleFonts.inter(fontSize: 14, color: AppColors.onSurface),
+                style: GoogleFonts.karla(fontSize: 14, color: AppColors.onSurface),
               ),
               subtitle: Text(
                 'Utiliser le flux original si compatible',
-                style: GoogleFonts.inter(fontSize: 12, color: AppColors.onSurfaceVariant),
+                style: GoogleFonts.karla(fontSize: 12, color: AppColors.onSurfaceVariant),
               ),
               value: settings.preferDirectPlay,
-              activeThumbColor: Colors.blueAccent,
+              activeThumbColor: AppColors.primary,
               onChanged: (v) => notifier.setPreferDirectPlay(v),
             ),
           ],
@@ -186,11 +186,11 @@ class StreamingSettingsTab extends ConsumerWidget {
             SwitchListTile(
               title: Text(
                 'Accélération NVIDIA GPU',
-                style: GoogleFonts.inter(fontSize: 14, color: AppColors.onSurface),
+                style: GoogleFonts.karla(fontSize: 14, color: AppColors.onSurface),
               ),
               subtitle: Text(
                 'Utiliser NVENC/NVDEC pour le transcodage (requiert GPU NVIDIA)',
-                style: GoogleFonts.inter(fontSize: 12, color: AppColors.onSurfaceVariant),
+                style: GoogleFonts.karla(fontSize: 12, color: AppColors.onSurfaceVariant),
               ),
               value: settings.enableNvidiaGpu,
               activeThumbColor: Colors.green,
@@ -204,20 +204,20 @@ class StreamingSettingsTab extends ConsumerWidget {
         Container(
           padding: const EdgeInsets.all(16),
           decoration: BoxDecoration(
-            color: Colors.blue.withOpacity(0.1),
+            color: AppColors.primaryContainer.withValues(alpha: 0.10),
             borderRadius: BorderRadius.circular(12),
-            border: Border.all(color: Colors.blue.withOpacity(0.3)),
+            border: Border.all(color: AppColors.primaryContainer.withValues(alpha: 0.32)),
           ),
           child: Row(
             children: [
-              const Icon(Icons.info_outline, color: Colors.blue),
+              const Icon(Icons.info_outline, color: AppColors.primary),
               const SizedBox(width: 12),
               Expanded(
                 child: Text(
                   'Les changements prennent effet immédiatement pour les nouveaux flux.',
-                  style: GoogleFonts.inter(
+                  style: GoogleFonts.karla(
                     fontSize: 12,
-                    color: Colors.blue.shade700,
+                    color: AppColors.primary,
                   ),
                 ),
               ),
@@ -236,9 +236,9 @@ class StreamingSettingsTab extends ConsumerWidget {
   }) {
     return Container(
       decoration: BoxDecoration(
-        color: Colors.white.withOpacity(0.05),
+        color: AppColors.onSurface.withOpacity(0.05),
         borderRadius: BorderRadius.circular(16),
-        border: Border.all(color: Colors.white.withOpacity(0.1)),
+        border: Border.all(color: AppColors.onSurface.withOpacity(0.1)),
       ),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -247,11 +247,11 @@ class StreamingSettingsTab extends ConsumerWidget {
             padding: const EdgeInsets.all(16),
             child: Row(
               children: [
-                Icon(icon, size: 20, color: Colors.blueAccent),
+                Icon(icon, size: 20, color: AppColors.primary),
                 const SizedBox(width: 8),
                 Text(
                   title,
-                  style: GoogleFonts.inter(
+                  style: GoogleFonts.karla(
                     fontSize: 16,
                     fontWeight: FontWeight.w600,
                     color: AppColors.onSurface,
@@ -260,7 +260,7 @@ class StreamingSettingsTab extends ConsumerWidget {
               ],
             ),
           ),
-          Divider(height: 1, color: Colors.white.withOpacity(0.1)),
+          Divider(height: 1, color: AppColors.onSurface.withOpacity(0.1)),
           ...children,
         ],
       ),
@@ -278,11 +278,11 @@ class StreamingSettingsTab extends ConsumerWidget {
     return ListTile(
       title: Text(
         title,
-        style: GoogleFonts.inter(fontSize: 14, color: AppColors.onSurface),
+        style: GoogleFonts.karla(fontSize: 14, color: AppColors.onSurface),
       ),
       subtitle: Text(
         subtitle,
-        style: GoogleFonts.inter(fontSize: 12, color: AppColors.onSurfaceVariant),
+        style: GoogleFonts.karla(fontSize: 12, color: AppColors.onSurfaceVariant),
       ),
       trailing: DropdownButton<T>(
         value: value,
@@ -293,12 +293,12 @@ class StreamingSettingsTab extends ConsumerWidget {
             value: item,
             child: Text(
               labelBuilder(item),
-              style: GoogleFonts.inter(fontSize: 13, color: AppColors.onSurface),
+              style: GoogleFonts.karla(fontSize: 13, color: AppColors.onSurface),
             ),
           );
         }).toList(),
         onChanged: onChanged,
-        style: GoogleFonts.inter(color: AppColors.onSurface),
+        style: GoogleFonts.karla(color: AppColors.onSurface),
         iconEnabledColor: AppColors.onSurfaceVariant,
       ),
     );