Eduardo Cruz's PWA web push feat (21b7ad5805, #44590) added a substantial
user-facing surface — manifest.webmanifest, sw.js, gateway push.web.*
methods, persisted vapid-keys.json/web-push-subscriptions.json, and
OPENCLAW_VAPID_* env overrides — but did not touch any docs/.
Add a 'PWA install and web push' section to docs/web/control-ui.md
covering the new persisted state files, env vars, and the four scope-gated
gateway methods (push.web.vapidPublicKey, push.web.subscribe,
push.web.unsubscribe, push.web.test). Distinguish from the existing
APNS relay-backed iOS push path.
1549ded4ac
