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

---------

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

mobile/lib/modules/settings/ui/local_storage_settings/local_storage_settings.dart

@@ -1,6 +1,7 @@
 import 'package:easy_localization/easy_localization.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart' show useEffect, useState;
+import 'package:immich_mobile/extensions/build_context_extensions.dart';
 import 'package:immich_mobile/modules/backup/models/duplicated_asset.model.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:immich_mobile/shared/providers/db.provider.dart';
@@ -25,7 +26,7 @@ class LocalStorageSettings extends HookConsumerWidget {
     }
 
     return ExpansionTile(
-      textColor: Theme.of(context).primaryColor,
+      textColor: context.primaryColor,
       title: const Text(
         "cache_settings_tile_title",
         style: TextStyle(
@@ -42,9 +43,7 @@ class LocalStorageSettings extends HookConsumerWidget {
         ListTile(
           title: Text(
             "Duplicated Assets (${cacheItemCount.value})",
-            style: Theme.of(context)
-                .textTheme
-                .labelLarge
+            style: context.textTheme.labelLarge
                 ?.copyWith(fontWeight: FontWeight.bold),
           ).tr(),
           subtitle: const Text(