fix(theme): remove every hardcoded Apple/Material colour left in the UI

Porting the palette was not enough: the Warm Cinema charter only reached the
widgets that read from AppColors. Nineteen screen and widget files still painted
Apple TV values inline, so the app kept showing blue — most visibly on the
selected navigation pill.

Swept out:
- 0xFF0A84FF (Apple blue) on the selected nav pill, category card icons and the
  "add playlist" button
- 0xFF4FC3F7 and 0xFF1565C0 in the player overlays
- Colors.blueAccent / Colors.blue in dialogs
- Apple greys 1C1C1E / 2C2C2E / 3A3A3C / 8E8E93 -> warm charcoals
- 128 Colors.white* -> the onSurfaceNN cream ladder (a pure white on a warm
  ground reads blue, which is the charter's whole point)
- Colors.red / green / amber / yellow / grey* -> error, success, ratingGold,
  outlineVariant
- pure black ink on light fills -> onPrimaryFixed, a warm near-black
- the white focus glow -> an ember glow

Deliberately left true black: the video surface backgrounds and the scrims over
posters and video, where a warm tint would clash with the picture.

Adds the onPrimaryFixed / primaryFixed / onSurface70 tokens the sweep needed.

Verified: no Material or Apple colour literal remains outside lib/core/theme;
flutter analyze reports no errors; 19/19 tests pass; release APK builds.

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

lib/mobile/widgets/mobile_category_card.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:xtremobile/core/theme/app_decorations.dart';
 import 'package:xtremobile/mobile/widgets/tv_focusable.dart';
+import 'package:xtremobile/core/theme/app_colors.dart';
 
 class MobileCategoryCard extends StatelessWidget {
   final String title;
@@ -13,7 +14,7 @@ class MobileCategoryCard extends StatelessWidget {
     required this.title,
     required this.onTap,
     this.icon = Icons.folder_rounded,
-    this.iconColor = const Color(0xFF0A84FF),
+    this.iconColor = AppColors.primary,
   });
 
   @override

lib/mobile/widgets/mobile_poster_card.dart

@@ -3,6 +3,7 @@ import 'package:cached_network_image/cached_network_image.dart';
 import 'package:xtremobile/core/theme/app_decorations.dart';
 import 'package:xtremobile/mobile/widgets/tv_focusable.dart';
 import 'package:xtremobile/core/utils/image_cache_config.dart';
+import 'package:xtremobile/core/theme/app_colors.dart';
 
 class MobilePosterCard extends StatelessWidget {
   final String title;
@@ -134,12 +135,12 @@ class MobilePosterCard extends StatelessWidget {
         child: Row(
           mainAxisSize: MainAxisSize.min,
           children: [
-            const Icon(Icons.star, color: Colors.amber, size: 10),
+            const Icon(Icons.star, color: AppColors.ratingGold, size: 10),
             const SizedBox(width: 2),
             Text(
               rating!,
               style: const TextStyle(
-                color: Colors.white,
+                color: AppColors.onSurface,
                 fontSize: 10,
                 fontWeight: FontWeight.bold,
               ),
@@ -157,13 +158,13 @@ class MobilePosterCard extends StatelessWidget {
       child: Container(
         padding: const EdgeInsets.all(4),
         decoration: const BoxDecoration(
-          color: Color(0xFF30D158),
+          color: AppColors.success,
           shape: BoxShape.circle,
         ),
         child: const Icon(
           Icons.check,
           size: 10,
-          color: Colors.white,
+          color: AppColors.onSurface,
         ),
       ),
     );

lib/mobile/widgets/mobile_scaffold.dart

@@ -4,6 +4,7 @@ import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:intl/intl.dart';
 import '../../core/theme/app_decorations.dart';
+import 'package:xtremobile/core/theme/app_colors.dart';
 
 class MobileScaffold extends ConsumerStatefulWidget {
   final Widget child;
@@ -71,7 +72,7 @@ class _MobileScaffoldState extends ConsumerState<MobileScaffold> {
                               fit: BoxFit.contain,
                               errorBuilder: (_, __, ___) => const Icon(
                                 Icons.play_circle_filled,
-                                color: Colors.white,
+                                color: AppColors.onSurface,
                                 size: 40,
                               ),
                             ),
@@ -201,12 +202,12 @@ class _AppleTVNavItemState extends State<_AppleTVNavItem> {
 
   @override
   Widget build(BuildContext context) {
-    const Color selectedColor = Color(0xFF0A84FF);
+    const Color selectedColor = AppColors.primaryFill;
     final Color unselectedColor = AppDecorations.textSecondary(context);
     final Color textColor =
-        widget.isSelected ? Colors.white : unselectedColor;
+        widget.isSelected ? AppColors.onSurface : unselectedColor;
     final Color iconColor =
-        widget.isSelected ? Colors.white : unselectedColor;
+        widget.isSelected ? AppColors.onSurface : unselectedColor;
     final FontWeight fontWeight =
         widget.isSelected ? FontWeight.w700 : FontWeight.w500;
 

lib/mobile/widgets/tv_focusable.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:xtremobile/core/theme/app_colors.dart';
 
 class TVFocusable extends StatefulWidget {
   final Widget child;
@@ -25,7 +26,7 @@ class TVFocusable extends StatefulWidget {
     this.autofocus = false,
     this.scale = 1.05, // Apple TV subtle lift
     this.borderWidth = 2.0,
-    this.focusColor = Colors.white,
+    this.focusColor = AppColors.onSurface,
     this.borderRadius,
     this.longPressDuration = const Duration(seconds: 3),
   });
@@ -162,7 +163,7 @@ class _TVFocusableState extends State<TVFocusable> {
                             offset: const Offset(0, 6),
                           ),
                           const BoxShadow(
-                            color: Color(0x40FFFFFF), // White glow
+                            color: Color(0x59D9541F), // Ember glow
                             blurRadius: 12,
                             spreadRadius: 0,
                           ),