refactor(mobile): build context extensions (#4923)

* refactor: move all extensions to separate package

* refactor(mobile): add BuildContext extension

* refactor(mobile): use theme getters from context

* refactor(mobile): use media query size from context

* refactor(mobile): use auto router methods from context

* refactor(mobile): use navigator methods from context

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Co-authored-by: shalong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

mobile/lib/modules/memories/ui/memory_lane.dart

@@ -1,7 +1,7 @@
-import 'package:auto_route/auto_route.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/extensions/build_context_extensions.dart';
 import 'package:immich_mobile/modules/memories/providers/memory.provider.dart';
 import 'package:immich_mobile/routing/router.dart';
 import 'package:immich_mobile/shared/ui/immich_image.dart';
@@ -31,7 +31,7 @@ class MemoryLane extends HookConsumerWidget {
                         child: GestureDetector(
                           onTap: () {
                             HapticFeedback.heavyImpact();
-                            AutoRouter.of(context).push(
+                            context.autoPush(
                               MemoryRoute(
                                 memories: memories,
                                 memoryIndex: index,