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/hooks/usePasswordEmail.ts

@@ -4,7 +4,7 @@ import { AsyncState, useAsyncCallback } from './useAsyncCallback';
 import { RequestEmailTokenCallback, RequestEmailTokenResponse } from './types';
 
 export const usePasswordEmail = (
-  mx: MatrixClient
+  mx: MatrixClient,
 ): [AsyncState<RequestEmailTokenResponse, MatrixError>, RequestEmailTokenCallback] => {
   const sendAttemptRef = useRef(1);
 
@@ -19,7 +19,7 @@ export const usePasswordEmail = (
         result,
       };
     },
-    [mx]
+    [mx],
   );
 
   const [passwordEmailState, passwordEmail] = useAsyncCallback<