chore: upgrade i18next 26, prettier 3, fontsource-variable, domhandler 6, lint-staged 17

- i18next 23->26 + react-i18next 15->17
- prettier 2->3, reformat all files
- replace @fontsource/inter with @fontsource-variable/inter 5, update import path
- domhandler 5->6 (aligns with transitive deps)
- lint-staged 16->17

src/app/components/message/content/ThumbnailContent.tsx

@@ -27,13 +27,13 @@ export function ThumbnailContent({ info, renderImage }: ThumbnailContentProps) {
       if (!mediaUrl) throw new Error('Invalid media URL');
       if (encInfo) {
         const fileContent = await downloadEncryptedMedia(mediaUrl, (encBuf) =>
-          decryptFile(encBuf, thumbInfo.mimetype ?? FALLBACK_MIMETYPE, encInfo)
+          decryptFile(encBuf, thumbInfo.mimetype ?? FALLBACK_MIMETYPE, encInfo),
         );
         return URL.createObjectURL(fileContent);
       }
 
       return mediaUrl;
-    }, [mx, info, useAuthentication])
+    }, [mx, info, useAuthentication]),
   );
 
   useEffect(() => {