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/presentation/widgets/asset_viewer/asset_viewer.state.dart

@@ -3,31 +3,35 @@ import 'package:immich_mobile/providers/asset_viewer/video_player_controls_provi
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 
 class AssetViewerState {
-  final int backgroundOpacity;
-  final bool showingBottomSheet;
+  final double backgroundOpacity;
+  final bool showingDetails;
   final bool showingControls;
+  final bool isZoomed;
   final BaseAsset? currentAsset;
   final int stackIndex;
 
   const AssetViewerState({
-    this.backgroundOpacity = 255,
-    this.showingBottomSheet = false,
+    this.backgroundOpacity = 1.0,
+    this.showingDetails = false,
     this.showingControls = true,
+    this.isZoomed = false,
     this.currentAsset,
     this.stackIndex = 0,
   });
 
   AssetViewerState copyWith({
-    int? backgroundOpacity,
-    bool? showingBottomSheet,
+    double? backgroundOpacity,
+    bool? showingDetails,
     bool? showingControls,
+    bool? isZoomed,
     BaseAsset? currentAsset,
     int? stackIndex,
   }) {
     return AssetViewerState(
       backgroundOpacity: backgroundOpacity ?? this.backgroundOpacity,
-      showingBottomSheet: showingBottomSheet ?? this.showingBottomSheet,
+      showingDetails: showingDetails ?? this.showingDetails,
       showingControls: showingControls ?? this.showingControls,
+      isZoomed: isZoomed ?? this.isZoomed,
       currentAsset: currentAsset ?? this.currentAsset,
       stackIndex: stackIndex ?? this.stackIndex,
     );
@@ -35,7 +39,7 @@ class AssetViewerState {
 
   @override
   String toString() {
-    return 'AssetViewerState(opacity: $backgroundOpacity, bottomSheet: $showingBottomSheet, controls: $showingControls)';
+    return 'AssetViewerState(opacity: $backgroundOpacity, showingDetails: $showingDetails, controls: $showingControls, isZoomed: $isZoomed)';
   }
 
   @override
@@ -44,8 +48,9 @@ class AssetViewerState {
     if (other.runtimeType != runtimeType) return false;
     return other is AssetViewerState &&
         other.backgroundOpacity == backgroundOpacity &&
-        other.showingBottomSheet == showingBottomSheet &&
+        other.showingDetails == showingDetails &&
         other.showingControls == showingControls &&
+        other.isZoomed == isZoomed &&
         other.currentAsset == currentAsset &&
         other.stackIndex == stackIndex;
   }
@@ -53,8 +58,9 @@ class AssetViewerState {
   @override
   int get hashCode =>
       backgroundOpacity.hashCode ^
-      showingBottomSheet.hashCode ^
+      showingDetails.hashCode ^
       showingControls.hashCode ^
+      isZoomed.hashCode ^
       currentAsset.hashCode ^
       stackIndex.hashCode;
 }
@@ -76,18 +82,18 @@ class AssetViewerStateNotifier extends Notifier<AssetViewerState> {
     state = state.copyWith(currentAsset: asset, stackIndex: 0);
   }
 
-  void setOpacity(int opacity) {
+  void setOpacity(double opacity) {
     if (opacity == state.backgroundOpacity) {
       return;
     }
-    state = state.copyWith(backgroundOpacity: opacity, showingControls: opacity == 255 ? true : state.showingControls);
+    state = state.copyWith(backgroundOpacity: opacity, showingControls: opacity >= 1.0 ? true : state.showingControls);
   }
 
-  void setBottomSheet(bool showing) {
-    if (showing == state.showingBottomSheet) {
+  void setShowingDetails(bool showing) {
+    if (showing == state.showingDetails) {
       return;
     }
-    state = state.copyWith(showingBottomSheet: showing, showingControls: showing ? true : state.showingControls);
+    state = state.copyWith(showingDetails: showing, showingControls: showing ? true : state.showingControls);
     if (showing) {
       ref.read(videoPlayerControlsProvider.notifier).pause();
     }
@@ -104,6 +110,13 @@ class AssetViewerStateNotifier extends Notifier<AssetViewerState> {
     state = state.copyWith(showingControls: !state.showingControls);
   }
 
+  void setZoomed(bool isZoomed) {
+    if (isZoomed == state.isZoomed) {
+      return;
+    }
+    state = state.copyWith(isZoomed: isZoomed);
+  }
+
   void setStackIndex(int index) {
     if (index == state.stackIndex) {
       return;