feat(mobile): inline asset details (#25952)

The existing implementation for showing asset details uses a bottom
sheet, and is not in sync with the preview or scroll intent. Other apps
use inline details, which is much cleaner and feels better to use.

mobile/lib/providers/infrastructure/asset_viewer/asset.provider.dart

@@ -0,0 +1,52 @@
+import 'dart:async';
+
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:immich_mobile/providers/infrastructure/asset.provider.dart';
+
+final currentAssetNotifier = AutoDisposeNotifierProvider<CurrentAssetNotifier, BaseAsset?>(CurrentAssetNotifier.new);
+
+class CurrentAssetNotifier extends AutoDisposeNotifier<BaseAsset?> {
+  KeepAliveLink? _keepAliveLink;
+  StreamSubscription<BaseAsset?>? _assetSubscription;
+
+  @override
+  BaseAsset? build() => null;
+
+  void setAsset(BaseAsset asset) {
+    _keepAliveLink?.close();
+    _assetSubscription?.cancel();
+    state = asset;
+    _assetSubscription = ref.watch(assetServiceProvider).watchAsset(asset).listen((updatedAsset) {
+      if (updatedAsset != null) {
+        state = updatedAsset;
+      }
+    });
+    _keepAliveLink = ref.keepAlive();
+  }
+
+  void dispose() {
+    _keepAliveLink?.close();
+    _assetSubscription?.cancel();
+  }
+}
+
+class ScopedAssetNotifier extends CurrentAssetNotifier {
+  final BaseAsset _asset;
+
+  ScopedAssetNotifier(this._asset);
+
+  @override
+  BaseAsset? build() {
+    setAsset(_asset);
+    return _asset;
+  }
+}
+
+final currentAssetExifProvider = FutureProvider.autoDispose((ref) {
+  final currentAsset = ref.watch(currentAssetNotifier);
+  if (currentAsset == null) {
+    return null;
+  }
+  return ref.watch(assetServiceProvider).getExif(currentAsset);
+});