ui: hide control footer in fullscreen; toggle fullscreen with the F key
The grid/archive control bar is hidden while its frame is fullscreen, so the video fills the screen cleanly. A global F-key handler toggles fullscreen of the active frame (live-main or arch-content) — entered and exited with F, and exited with Esc as well. Uses e.code (KeyF) so it works on non-Latin layouts and ignores typing in inputs and Ctrl/Cmd/Alt combos. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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