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/search/ui/search_row_title.dart

@@ -1,5 +1,6 @@
 import 'package:easy_localization/easy_localization.dart';
 import 'package:flutter/material.dart';
+import 'package:immich_mobile/extensions/build_context_extensions.dart';
 
 class SearchRowTitle extends StatelessWidget {
   final Function() onViewAllPressed;
@@ -26,14 +27,14 @@ class SearchRowTitle extends StatelessWidget {
         children: [
           Text(
             title,
-            style: Theme.of(context).textTheme.titleSmall,
+            style: context.textTheme.titleSmall,
           ),
           TextButton(
             onPressed: onViewAllPressed,
             child: Text(
               'search_page_view_all_button',
               style: TextStyle(
-                color: Theme.of(context).primaryColor,
+                color: context.primaryColor,
                 fontWeight: FontWeight.bold,
                 fontSize: 14.0,
               ),