prf frames are ed25519-signed, friend-visible only (unknown pubkey is ignored).
/profile edits self; F5 and /who show the selected friend's last profile.
- Hand-written wordmark banner (<=80 cols, auto-collapses to a compact
mark below banner width) plus onion glyph and themed screen headings
- Color-palette consts, stateful pane titles, highlighted selection row
(accent + bg), context-sensitive footer that always keeps '? help'
- Pane focus model (roster/chat/composer) with Tab/Shift-Tab, 1/2/3,
j/k + arrows, g/G, and a '?' help overlay; Esc closes any overlay
- New tests/tui_chrome.rs: banner widths, help overlay bindings, real
footer helper at 80 and 120 cols, 80x24 draw smoke test
- README keybinding table updated to match
Locked helper strings (fingerprint_mismatch_banner, rotate_screen_text,
wipe_screen_text, parse_slash) unchanged; UI-only (src/tui.rs).
