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>

haven/res/drawable/ic_bg.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <gradient android:angle="270" android:startColor="#245268" android:endColor="#0d1d29" />
+</shape>

haven/res/drawable/loading.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@drawable/ic_bg" />
+    <item android:gravity="center" android:width="160dp" android:height="160dp" android:drawable="@drawable/ic_fg" />
+</layer-list>

haven/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_bg" />
+    <foreground android:drawable="@drawable/ic_fg" />
+</adaptive-icon>

haven/res/values/values.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Haven</string>
+    <style name="AppTheme" parent="android:Theme.Material.NoActionBar">
+        <item name="android:windowBackground">@drawable/loading</item>
+        <item name="android:statusBarColor">@color/bg</item>
+        <item name="android:navigationBarColor">@color/bg</item>
+        <item name="android:colorAccent">#f4a531</item>
+    </style>
+    <color name="bg">#0d1d29</color>
+</resources>