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/AutoDiscovery.tsx

@@ -14,7 +14,7 @@ export function AutoDiscovery({ userId, baseUrl, children }: AutoDiscoveryProps)
     useCallback(async () => {
       const server = getMxIdServer(userId);
       return autoDiscovery(fetch, server ?? userId);
-    }, [userId])
+    }, [userId]),
   );
 
   const [, info] = state.status === AsyncStatus.Success ? state.data : [];
@@ -25,7 +25,7 @@ export function AutoDiscovery({ userId, baseUrl, children }: AutoDiscoveryProps)
         base_url: baseUrl,
       },
     }),
-    [baseUrl]
+    [baseUrl],
   );
 
   return <AutoDiscoveryInfoProvider value={info ?? fallback}>{children}</AutoDiscoveryInfoProvider>;