opt-in usage notes and a stats dashboard

Release builds ask in setup and Settings whether to send a short note when the app is opened and after each drive: the version, plus the Android version, phone model and cars people tick. Nothing runs in the background. Dev builds always send. The Cloudflare Worker in stats-worker/ stores the notes and serves a private dashboard with GitHub downloads alongside.

gearslip/src/main/AndroidManifest.xml

@@ -74,6 +74,8 @@
          LAUNCHER query below to find, so the setup guide's Android Auto check needs this to see
          whether the package is installed at all. -->
     <package android:name="com.google.android.projection.gearhead" />
+    <!-- Every GrapheneOS install has this; the opt-in usage note uses it to say "GrapheneOS". -->
+    <package android:name="app.grapheneos.setupwizard" />
     <intent>
         <action android:name="android.intent.action.MAIN" />
         <category android:name="android.intent.category.LAUNCHER" />