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/config.yaml

@@ -1,5 +1,5 @@
 name: Dashboard Studio
-version: "1.14.1"
+version: "2.0.0"
 slug: dashboard_studio
 description: Drag-and-drop dashboard builder with a free-form grid, live entity widgets and themes.
 url: https://git.melvanveen.nl/veenm/ha-dashboard-studio
@@ -15,6 +15,8 @@ ingress_port: 8099
 ingress_stream: true
 panel_icon: mdi:view-dashboard-edit
 panel_title: Dashboard Studio
+# Everyone with a login gets it in the sidebar; Dashboard Studio itself decides what each person sees.
+panel_admin: false
 homeassistant_api: true
 options:
   immich_url: ""