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/memories/views/memory_page.dart

@@ -1,8 +1,8 @@
-import 'package:auto_route/auto_route.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/extensions/build_context_extensions.dart';
 import 'package:immich_mobile/modules/memories/models/memory.dart';
 import 'package:immich_mobile/modules/memories/ui/memory_card.dart';
 import 'package:immich_mobile/shared/models/asset.dart';
@@ -182,14 +182,14 @@ class MemoryPage extends HookConsumerWidget {
                   currentMemory.value.assets.length;
               if (isLastAsset &&
                   (offset > notification.metrics.maxScrollExtent + 150)) {
-                AutoRouter.of(context).pop();
+                context.autoPop();
                 return true;
               }
             }
             // Horizontal scroll handling
             if (notification.depth == 1 &&
                 (offset > notification.metrics.maxScrollExtent + 100)) {
-              AutoRouter.of(context).pop();
+              context.autoPop();
               return true;
             }
           }
@@ -244,7 +244,7 @@ class MemoryPage extends HookConsumerWidget {
                           child: MemoryCard(
                             asset: asset,
                             onTap: () => toNextAsset(index),
-                            onClose: () => AutoRouter.of(context).pop(),
+                            onClose: () => context.autoPop(),
                             rightCornerText: assetProgress.value,
                             title: memories[mIndex].title,
                             showTitle: index == 0,