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>

web/vendor/hls.min.js

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web/vendor/mpegts.min.js

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+/*!
+ * @overview es6-promise - a tiny implementation of Promises/A+.
+ * @copyright Copyright (c) 2014 Yehuda Katz, Tom Dale, Stefan Penner and contributors (Conversion to ES6 API by Jake Archibald)
+ * @license   Licensed under MIT license
+ *            See https://raw.githubusercontent.com/stefanpenner/es6-promise/master/LICENSE
+ * @version   v4.2.8+1e68dce6
+ */var n;n=function(){"use strict";function e(e){return"function"==typeof e}var n=Array.isArray?Array.isArray:function(e){return"[object Array]"===Object.prototype.toString.call(e)},a=0,r=void 0,s=void 0,o=function(e,t){f[a]=e,f[a+1]=t,2===(a+=2)&&(s?s(p):b())},d="undefined"!=typeof window?window:void 0,_=d||{},h=_.MutationObserver||_.WebKitMutationObserver,c="undefined"==typeof self&&void 0!==t&&"[object process]"==={}.toString.call(t),u="undefined"!=typeof Uint8ClampedArray&&"undefined"!=typeof importScripts&&"undefined"!=typeof MessageChannel;function l(){var e=setTimeout;return function(){return e(p,1)}}var f=new Array(1e3);function p(){for(var e=0;e<a;e+=2)(0,f[e])(f[e+1]),f[e]=void 0,f[e+1]=void 0;a=0}var m,g,v,y,b=void 0;function S(e,t){var i=this,n=new this.constructor(R);void 0===n[A]&&P(n);var a=i._state;if(a){var r=arguments[a-1];o((function(){return I(a,n,r,i._result)}))}else C(i,n,e,t);return n}function E(e){if(e&&"object"==typeof e&&e.constructor===this)return e;var 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