Pushes to feat/v2-ui publish the pre-release v2-ui-preview (never latest);
its steamify-app.sh downloads that build (STEAMIFY_RELEASE). The app's
1280x720 layout now stretches to the window's shape, so the bars reach the
edges; re-apply resets when back on the menu.
bios_enable split into bios_prepare (download, checksum, fwupd check) and
bios_flash; the terminal flow is unchanged. The app: check, warning 1,
warning 2 (type UPDATE, or hold A/OK for 5 seconds), flash, restart.
ui/steamify-ui (PySide6 + QML): menu, review, password, applying and done
screens from the design, scaled to the window. Controller via evdev,
keyboard, TV remote (cecd). steamify.sh --backend status|apply (lib/backend.sh)
drives the same components; sudo asks through an askpass helper.