The HTML session export bound "toggle thinking" and "toggle tools"
to `Ctrl+T` and `Ctrl+O`. Both are reserved by every major browser
(new tab and open file), so the chord never reached the page and the
advertised toggles were unreachable.
Switch to bare `T` / `O`, ignore the keystroke while focus is in an
`<input>`/`<textarea>`/`[contenteditable]` (so the sidebar search
still accepts those letters), and let any chord with Ctrl/Meta/Alt
pass through to the browser. Help bar updated to match.
Fixes#3670
roboomp
edac618351