Release 0.0.05-alpha: guided setup, downloadable certificate, car phone app, media rework

- First run now asks for permissions one at a time, each on its own screen with an Allow or
  Skip, instead of firing every system dialog at once from a cold start
- The head unit certificate can be downloaded straight from the opencardev/aasdk repository
  with one tap, on top of the existing adb-staged and file-import paths; Settings shows which
  source is active and lets an imported or downloaded certificate be removed
- A phone app on the car screen: a keypad and a searchable contacts list, with a confirmation
  card before every call
- The web browser draws its own on-screen keyboard for a page's text fields, so a search box or
  address bar can be typed into from the car screen
- Media player rework: a dedicated Now Playing tab with a bigger, screen-size-aware layout, an
  Up Next tab showing the app's real queue, and Browse/Lyrics tabs that share the same rail
- Waze and Google Messages are marked broken instead of pretending to work; Google's own dialer,
  Assistant, and Android Auto entries are hidden from the car launcher entirely; Aardvark and
  Vivi Music are marked tested and working
- A help screen replaces the old wall of setup text on the home screen
- The display-calibration screen is gone - it did its job

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarSettingsScreen.kt

@@ -117,9 +117,6 @@ fun CarSettingsScreen() {
             Info("Video", display.ifEmpty { "-" })
             Info("Certificate", cert?.headline ?: "Checking…")
         }
-        val navigator = LocalCarNavigator.current
-        Button(onClick = { navigator.open("calibrate") }) { Text("Display test") }
-        Spacer(Modifier.height(8.dp))
     }
 }