v1.22.0

Add an optional "Keep launcher running" foreground service

Settings -> System: a new toggle (off by default) runs a minimal
foreground service with a silent, permanent notification, to make it
less likely Android kills the launcher process in the background -
the root cause of Home sometimes needing a second press. Enabling it
also asks to be exempted from battery optimizations, since OxygenOS
and similar OEM skins can still kill a plain foreground service.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KanGnvgaQn2Pg84pfu3TUM