merge: sync upstream duckietm/Dev (b2318b9) into feat/react19-modernization

Absorbs 10 upstream commits (JSON5 config support, user-settings reset
password/email/username, wear-badge popup fix, login screen fix, About
update, offer selection logic, client path fix).

Conflicts resolved by keeping the modernized React 19 / Zustand / Form
Actions structure and porting upstream intent surgically:

- bootstrap.ts: kept GetConfiguration().init() pre-init + useEffectEvent,
  added JSON5 import (already wired into the parse fallback)
- LoginView.tsx: kept Form Actions (useActionState/useFormStatus); the
  upstream persistAccessTokenFromPayload(payload) fix was already
  integrated in the modernized SSO branch
- App.tsx: kept useEffectEvent import + StrictMode/ErrorBoundary umbrella
- vite.config.mjs: kept sirv plugin + react-compiler babel; absorbed
  upstream's base: process.env.VITE_BASE || './'
- package.json: kept superset (sirv, Vitest, Zustand, react-colorful,
  React Compiler) + added json5
- User-settings views: accepted upstream (duplicate of local cherry-pick
  2053c8e); notification badge bubble: accepted upstream fix

Verification: yarn typecheck clean, 193/193 Vitest, yarn build green.

src/App.tsx

@@ -69,7 +69,7 @@ export const App: FC<{}> = props =>
     const [ isReady, setIsReady ] = useState(false);
     const [ errorMessage, setErrorMessage ] = useState('');
     const [ homeUrl, setHomeUrl ] = useState('');
-    const [ showLogin, setShowLogin ] = useState(() => !window.NitroConfig?.['sso.ticket'] && !hasRememberLogin());
+    const [ showLogin, setShowLogin ] = useState(false);
     const [ isEnteringHotel, setIsEnteringHotel ] = useState(() => !!window.NitroConfig?.['sso.ticket'] || hasRememberLogin());
     const [ prepareTrigger, setPrepareTrigger ] = useState(0);
     const warmupPromiseRef = useRef<Promise<void>>(null);