The composer's Editable set no spellCheck/autoCorrect/autoCapitalize/inputMode,
so the browser default (spellcheck on) applied. On Gboard that draws the red
underline and swaps the keyboard for a correction modal when the caret touches
a flagged word. Add 'Spellcheck in composer' (Settings > General > Editor),
defaulting to off when the primary pointer is coarse and on otherwise. Off also
sets autoCorrect=off, since spellCheck alone leaves the suggestion UI in place.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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