fix thumbnail generation for videos

lib/src/services/mediafiles/mediafile.service.dart

@@ -199,7 +199,7 @@ class MediaFileService {
   File get thumbnailPath => _buildFilePath(
         'stored',
         namePrefix: '.thumbnail',
-        extensionParam: 'webp',
+        extensionParam: 'png',
       );
   File get encryptedPath => _buildFilePath(
         'tmp',

lib/src/views/memories/memories.view.dart

@@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:twonly/globals.dart';
+import 'package:twonly/src/database/tables/mediafiles.table.dart';
 import 'package:twonly/src/database/twonly.db.dart';
 import 'package:twonly/src/model/memory_item.model.dart';
 import 'package:twonly/src/services/mediafiles/mediafile.service.dart';
@@ -54,6 +55,11 @@ class MemoriesViewState extends State<MemoriesView> {
           applicationSupportDirectory: applicationSupportDirectory,
         );
         if (!mediaService.imagePreviewAvailable) continue;
+        if (mediaService.mediaFile.type == MediaType.video) {
+          if (!mediaService.thumbnailPath.existsSync()) {
+            await mediaService.createThumbnail();
+          }
+        }
         galleryItems.add(
           MemoryItem(
             mediaService: mediaService,
@@ -146,7 +152,5 @@ class MemoriesViewState extends State<MemoriesView> {
       ),
     ) as bool?;
     setState(() {});
-
-    await initAsync();
   }
 }

lib/src/views/updates/62_database_migration.view.dart

@@ -159,6 +159,7 @@ class _DatabaseMigrationViewState extends State<DatabaseMigrationView> {
         MediaFilesCompanion(
           type: Value(type),
           createdAt: Value(stat.modified),
+          stored: const Value(true),
         ),
       );
       final mediaService = await MediaFileService.fromMedia(mediaFile!);