Dashboard Studio 2.0.0: Admin, Builder and Dashboard screens, roles, Haven

- Home Assistant administrators are admins: Dashboard, Builder and Admin screens
- Everyone else only sees the dashboards an admin chose, always in kiosk mode;
  the server enforces it (saving, people, devices, history are admin-only, and
  the websocket only allows reading states and controlling devices)
- Admin screen: dashboards, people and what each sees (with preview), devices,
  messages to the screens, the Haven app, activity, about
- Haven: new Android app (haven/) that only shows dashboards; replaces the
  Dashboard Studio Android app and signs in through Home Assistant's page
- Screens pick up dashboard and access changes within a minute
- Version history records who made each change; panel visible to all users

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dashboard_studio/web/sw.js

@@ -21,7 +21,9 @@ self.addEventListener("fetch", (e) => {
         return res;
       }
       if (!page) return res;
-      throw new Error(String(res.status));
+      // Signed out of Home Assistant: the last good copy renews the session itself. Without one, pass
+      // the refusal on, so Haven knows to sign in again.
+      return (await cache.match(new URL("./", self.registration.scope).href)) || res;
     } catch (err) {
       const hit = page ? await cache.match(new URL("./", self.registration.scope).href) : await cache.match(req);
       if (hit) return hit;