App 2.7.1: voice-key double press works; floating button removed

The car's key report, from the on-screen key log in 2.7.0:
android.intent.extra.hardkey.keycode = 287 (Integer),
android.intent.extra.hardkey.down (Boolean; one report on press, one on
release) and android.intent.extra.hardkey.longpress (Boolean). 2.7.0
only looked for short names like "keyCode", so it never found the code.
SteeringKeyReport now matches extras by the last part of their name,
case-insensitively, and is Android-free; its tests include the exact
double press logged on the car (releases 279 ms apart). Replayed in the
car's format on the emulator: double press opens the app, single and
long presses do not.

The floating button is removed (class, geometry and test, the overlay
permission, setting, switch and strings): it did not show over the MG4
launcher.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QLJfZQZeAKAwSqViTmLzki

app/src/main/AndroidManifest.xml

@@ -13,8 +13,6 @@
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_LOCATION" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
-    <!-- The floating button that opens the app; the head unit's launcher does not list it. -->
-    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
 
     <!-- Wi-Fi auto-join. CHANGE_WIFI_STATE covers enabling the radio and asking the
          supplicant to join a network the unit already has saved; ACCESS_WIFI_STATE covers