On launch and on every destination switch the first card of the
content gets focus automatically - invisible focus on chrome confused
'Do I need to press DOWN first?'. The search button shows a white ring
when focused, and the top bar gained a real account button (person
icon + logged-in username) replacing the cryptic monitor icon.
start-emulator.sh: headless-safe boot (no -gpuhost crash without a
display), whitelists adb public keys headlessly (drop them into
/tmp/jtube-adbkeys/), and starts the socat bridge itself.
scrcpy cannot talk to headless emulators inside the container: the
AOSP ATD image lacks framework pieces (KeyCharacterMap NPE) and there
is no GPU/KVM in the container at all. The script boots the android-tv
image image on the host with -gpu host and a window (so the RSA dialog
is clickable), installs the current debug APK and leaves the app
running; the container's socat bridge then exposes it as
rutherford:5556 for adb/scrcpy from anywhere.
