The trace flavor manifest removed PostActivity and made ServerControlActivity
the launcher, so the APK opened straight into the render server screen. Keep
both screens: PostActivity is the launcher again, and a bottom navigation bar
(NavBar, plugin flavor unaffected) switches between them via
FLAG_ACTIVITY_REORDER_TO_FRONT with transitions suppressed, so each screen
keeps its state. ServerControlActivity is singleTop now and handles extras in
onNewIntent so adb-driven starts still work. The POST screen also shows an
indeterminate progress bar while the self-test runs.
ServerControlActivity (trace flavor) collects the listen endpoint, auth
token and extra env, then drives MobileGLServerService with the same
extras adb used. Non-loopback listens are held to the 16-byte token the
server enforces, and a connect probe confirms the supervisor bound its
socket. The screen is the APK's launcher icon, which the trace flavor
lacked since PostActivity is removed there.
swung0x48