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/pages/client/ClientRoot.tsx

@@ -154,11 +154,11 @@ export function ClientRoot({ children }: ClientRootProps) {
         throw new Error('No session Found!');
       }
       return initClient(session);
-    }, [])
+    }, []),
   );
   const mx = loadState.status === AsyncStatus.Success ? loadState.data : undefined;
   const [startState, startMatrix] = useAsyncCallback<void, Error, [MatrixClient]>(
-    useCallback((m) => startClient(m), [])
+    useCallback((m) => startClient(m), []),
   );
 
   useLogoutListener(mx);
@@ -181,7 +181,7 @@ export function ClientRoot({ children }: ClientRootProps) {
       if (state === 'PREPARED') {
         setLoading(false);
       }
-    }, [])
+    }, []),
   );
 
   return (