Merge pull request 'Fix system Back ownership for titles and Home' (#67) from fm/tv-back-title into fm/tv-round2

data/tv-spec/spec.md

@@ -12,6 +12,8 @@ Source — Justin (2026-11-07): “the settings icon moved, but pressing down on
 
 Root content Back moves to the nav; the next Back **finishes and removes Wolfskin’s Android task**, returning to the launcher without visiting an old Home/setup interface. This applies to Home, Discover, Movies, Shows and Anime. Cold-launch picker Back exits; a reopened picker first dismisses to its opener’s nav. Pushed title/person/settings/Updates pages pop their parent stack, and menus/sheets/unsaved-settings prompts get first refusal. A singleton full-screen page exits rather than becoming a dead end.
 
+Native Android Back (`KEYCODE_BACK`) belongs exclusively to the activity’s system dispatcher, including Navigation 3 predictive completion; Compose key previews must not also navigate on its raw key-down. Escape remains the existing local keyboard Back shortcut. Each completed system Back has one consumer. A retained title/person callback checks the live navigation entry at invocation and hands Back to the incoming entry if its own entry has already popped; it does not depend on an enabled flag catching up with the exit animation. Root handling synchronizes the shell route to the current entry before applying content → nav → task exit. Back ownership is exercised on both SDK 34 (Android 14) and SDK 36.
+
 Source — Justin (2026-11-07): “pressing back enough times should close wolfskin, currently there is no way to go back to projectivity apart from weird methods via the old ui”.
 
 ## Focus visibility