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/features/settings/devices/LocalBackup.tsx

@@ -30,8 +30,8 @@ function ExportKeys() {
         });
         FileSaver.saveAs(blob, 'lotus-keys.txt');
       },
-      [mx]
-    )
+      [mx],
+    ),
   );
 
   const exporting = exportState.status === AsyncStatus.Loading;
@@ -176,8 +176,8 @@ function ImportKeys({ file, onDone }: ImportKeysProps) {
 
         await crypto.importRoomKeysAsJson(keys);
       },
-      [file, mx]
-    )
+      [file, mx],
+    ),
   );
 
   const decrypting = decryptState.status === AsyncStatus.Loading;