Auto select of gallery based on previewable files whenever folder changes, added more file extensions to autodetection.

frontend/src/repositories/Document.ts

@@ -44,7 +44,10 @@ export class Doc {
     if (this.img) return true
     const ext = this.name.split('.').pop()?.toLowerCase()
     // Not a comprehensive list, but good enough for now
-    return ['mp4', 'mkv', 'webm', 'ogg', 'mp3', 'flac', 'aac', 'pdf'].includes(ext || '')
+    return [
+      'mp4', 'mkv', 'webm', 'ogg', 'mp3', 'flac', 'aac', 'pdf',
+      'avif', 'heic', 'heif', 'jpg', 'jpeg', 'png'
+    ].includes(ext || '')
   }
   get previewurl(): string {
     return this.url.replace(/^\/files/, '/preview')