feat(mobile): add album description functionality (#18886)

* feat(mobile): add album description functionality

- Introduced a new optional `description` field in the `Album` entity.
- Updated `AlbumViewerPageState` to manage `editDescriptionText`.
- Created `AlbumDescription` and `AlbumViewerEditableDescription` widgets for displaying and editing album descriptions.
- Enhanced `CreateAlbumPage` to include a description input field.
- Implemented backend support for updating album descriptions in `AlbumApiRepository` and `AlbumService`.
- Updated sync logic to handle album descriptions during data synchronization.
- Adjusted UI components to accommodate the new description feature.

* fix dart analysis error

* remove comment that shouldn't be there

* Album header styling

* fix: disable edit after album creation

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/providers/album/album_viewer.provider.dart

@@ -5,7 +5,13 @@ import 'package:immich_mobile/entities/album.entity.dart';
 
 class AlbumViewerNotifier extends StateNotifier<AlbumViewerPageState> {
   AlbumViewerNotifier(this.ref)
-      : super(AlbumViewerPageState(editTitleText: "", isEditAlbum: false));
+      : super(
+          AlbumViewerPageState(
+            editTitleText: "",
+            isEditAlbum: false,
+            editDescriptionText: "",
+          ),
+        );
 
   final Ref ref;
 
@@ -21,12 +27,24 @@ class AlbumViewerNotifier extends StateNotifier<AlbumViewerPageState> {
     state = state.copyWith(editTitleText: newTitle);
   }
 
+  void setEditDescriptionText(String newDescription) {
+    state = state.copyWith(editDescriptionText: newDescription);
+  }
+
   void remoteEditTitleText() {
     state = state.copyWith(editTitleText: "");
   }
 
+  void remoteEditDescriptionText() {
+    state = state.copyWith(editDescriptionText: "");
+  }
+
   void resetState() {
-    state = state.copyWith(editTitleText: "", isEditAlbum: false);
+    state = state.copyWith(
+      editTitleText: "",
+      isEditAlbum: false,
+      editDescriptionText: "",
+    );
   }
 
   Future<bool> changeAlbumTitle(
@@ -46,6 +64,28 @@ class AlbumViewerNotifier extends StateNotifier<AlbumViewerPageState> {
     state = state.copyWith(editTitleText: "", isEditAlbum: false);
     return false;
   }
+
+  Future<bool> changeAlbumDescription(
+    Album album,
+    String newAlbumDescription,
+  ) async {
+    AlbumService service = ref.watch(albumServiceProvider);
+
+    bool isSuccess = await service.changeDescriptionAlbum(
+      album,
+      newAlbumDescription,
+    );
+
+    if (isSuccess) {
+      state = state.copyWith(editDescriptionText: "", isEditAlbum: false);
+
+      return true;
+    }
+
+    state = state.copyWith(editDescriptionText: "", isEditAlbum: false);
+
+    return false;
+  }
 }
 
 final albumViewerProvider =