feat: XMLTV EPG fallback, Warm Cinema theme, background release

Align the Android app with xtremflow on three fronts.

EPG: add XmltvService, a streaming XMLTV parser (gunzip-aware, indexed to a
-3h/+18h window, JSON disk cache with a 6h TTL). XtreamServiceMobile now falls
back through the provider's xmltv.php, a user-supplied URL, then a community
guide whenever get_short_epg returns nothing. Channels are matched on
epg_channel_id first, then on a normalized name (accents, HD/FHD/4K suffixes,
"FR:" and "|FR|" prefixes). A streamId -> Channel index populated by
getLiveChannels supplies those keys, so no getShortEPG call site changed.
EPG requests are also funnelled through a 3-slot semaphore, as in xtremflow:
a 30-tile grid used to fire 30 parallel player_api.php calls, which rate-limited
panels answered with errors, emptying the guide for the whole screen.

Theme: port the Warm Cinema charter (ember/charcoal/cream, Fraunces + Karla)
into app_colors, app_theme and app_decorations. The 21 Apple TV colour names
already in use are kept as compatibility aliases. mobile_theme now derives from
AppTheme instead of duplicating its 390 lines.

Playback lifecycle: stop reacting to AppLifecycleState.inactive, which fires on
transient Android interruptions such as pulling down the notification shade and
was killing playback. Both engines now release on paused/hidden/detached via
_releasePlayback(): stream stopped, decoder released, timers cancelled, wakelock
dropped. An _isReleased latch keeps the watchdog and reconnect paths from
restarting a stream from the background.

Long-run stability: cancel the six player stream subscriptions on dispose, cap
demuxer-max-back-bytes at 8MB (mpv defaults to 50MiB, which combined with the
150MB readahead pushed the native heap toward an Android memory kill after a few
hours), rebuild on position only while the controls are visible, and dispose the
Lite player's focus nodes.

Startup: prewarmHost() pre-resolves DNS and opens then closes a bare TCP/TLS
socket before playback. No HTTP request is issued, so no provider connection
slot is consumed. Capped at 1.5s.

Verified: flutter analyze clean on all touched files; 19/19 tests, including a
run over a real 46MB/69802-programme dump (517 channels indexed in 1.1s, 5/5
name probes matched); flutter build apk --release succeeds.

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

lib/mobile/providers/mobile_xtream_providers.dart

@@ -2,6 +2,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../../core/models/playlist_config.dart';
 import '../../core/models/iptv_models.dart' as model;
 import '../../features/iptv/services/xtream_service_mobile.dart';
+import 'mobile_settings_providers.dart';
 
 /// Mobile-specific Xtream service provider
 import 'package:path_provider/path_provider.dart';
@@ -13,6 +14,23 @@ final mobileXtreamServiceProvider =
   final service = XtreamServiceMobile(dir.path);
   await service
       .setPlaylistAsync(playlist); // Async to resolve DNS before API calls
+
+  // EPG fallback configuration follows the settings live, without tearing the
+  // service (and its caches) down on every unrelated settings change.
+  void applyEpgSettings(MobileSettings settings) => service.setXmltvConfig(
+        customUrl: settings.xmltvUrl,
+        allowPublicFallback: settings.useCommunityEpg,
+      );
+
+  applyEpgSettings(ref.read(mobileSettingsProvider));
+  ref.listen<MobileSettings>(mobileSettingsProvider, (previous, next) {
+    if (previous?.xmltvUrl != next.xmltvUrl ||
+        previous?.useCommunityEpg != next.useCommunityEpg) {
+      applyEpgSettings(next);
+    }
+  });
+
+  ref.onDispose(service.dispose);
   return service;
 });