fix(mobile): use correct delete action (#26575)

fix(mobile): use correct delete for trashed assets

When viewing a trashed asset, the viewer bottom bar now shows the permanent delete button instead of the trash button, which had no effect on already-trashed assets.

mobile/lib/domain/models/asset/remote_asset.model.dart

@@ -11,6 +11,7 @@ class RemoteAsset extends BaseAsset {
   final String ownerId;
   final String? stackId;
   final DateTime? uploadedAt;
+  final DateTime? deletedAt;
 
   const RemoteAsset({
     required this.id,
@@ -31,6 +32,7 @@ class RemoteAsset extends BaseAsset {
     super.livePhotoVideoId,
     this.stackId,
     required super.isEdited,
+    this.deletedAt,
   }) : localAssetId = localId;
 
   @override
@@ -48,6 +50,8 @@ class RemoteAsset extends BaseAsset {
   @override
   bool get isEditable => isImage && !isMotionPhoto && !isAnimatedImage;
 
+  bool get isTrashed => deletedAt != null;
+
   @override
   String toString() {
     return '''Asset {
@@ -86,7 +90,8 @@ class RemoteAsset extends BaseAsset {
         thumbHash == other.thumbHash &&
         visibility == other.visibility &&
         stackId == other.stackId &&
-        uploadedAt == other.uploadedAt;
+        uploadedAt == other.uploadedAt &&
+        deletedAt == other.deletedAt;
   }
 
   @override
@@ -98,7 +103,8 @@ class RemoteAsset extends BaseAsset {
       thumbHash.hashCode ^
       visibility.hashCode ^
       stackId.hashCode ^
-      uploadedAt.hashCode;
+      uploadedAt.hashCode ^
+      deletedAt.hashCode;
 
   RemoteAsset copyWith({
     String? id,
@@ -119,6 +125,7 @@ class RemoteAsset extends BaseAsset {
     String? livePhotoVideoId,
     String? stackId,
     bool? isEdited,
+    DateTime? deletedAt,
   }) {
     return RemoteAsset(
       id: id ?? this.id,
@@ -139,6 +146,7 @@ class RemoteAsset extends BaseAsset {
       livePhotoVideoId: livePhotoVideoId ?? this.livePhotoVideoId,
       stackId: stackId ?? this.stackId,
       isEdited: isEdited ?? this.isEdited,
+      deletedAt: deletedAt ?? this.deletedAt,
     );
   }
 }
@@ -156,6 +164,7 @@ class RemoteAssetExif extends RemoteAsset {
     required super.createdAt,
     required super.updatedAt,
     super.uploadedAt,
+    super.deletedAt,
     super.width,
     super.height,
     super.durationMs,
@@ -193,6 +202,7 @@ class RemoteAssetExif extends RemoteAsset {
     DateTime? createdAt,
     DateTime? updatedAt,
     DateTime? uploadedAt,
+    DateTime? deletedAt,
     int? width,
     int? height,
     int? durationMs,
@@ -214,6 +224,7 @@ class RemoteAssetExif extends RemoteAsset {
       createdAt: createdAt ?? this.createdAt,
       updatedAt: updatedAt ?? this.updatedAt,
       uploadedAt: uploadedAt ?? this.uploadedAt,
+      deletedAt: deletedAt ?? this.deletedAt,
       width: width ?? this.width,
       height: height ?? this.height,
       durationMs: durationMs ?? this.durationMs,