The textarea focuses on mount and when an overlay closes (remount), but focus
could drift to the transcript scrollbox on a mouse-scroll, dropping keystrokes.
Now (opencode's keep-the-prompt-focused idea, adapted):
- onMouseDown → focus the textarea (click-to-focus).
- a global keystroke net: a PRINTABLE, unmodified key while the textarea is
unfocused reclaims focus AND recovers the char (the in-flight event went to
the global handler, not the unfocused textarea, so insert it). Nav/scroll keys
(arrows/page/home/end/…) are deliberately left alone so keyboard transcript
scroll still works; kitty `release` events are skipped to avoid double-insert.
Completion accept/dismiss handler folded into the same useKeyboard with early
returns.
Live-smoked: type → text lands; `/` → completions; Esc → dismiss; type again →
lands; clean quit. 60 pass.