T-227. A tap on empty conversation area now lands the cursor in the
composer. The conversation area is wrapped in a translucent
GestureDetector whose onTap focuses a pane-owned composer FocusNode, so
message links, copy buttons, and the SelectableRegion's selection drags
keep winning their own gestures — only an unclaimed tap reaches us. It's
a no-op while a prompt holds the interaction zone (D-78), so a tap never
pulls focus over an open prompt.
The composer learned to accept an external focus node (the pane owns it,
so it survives composer remounts) and attaches its key handling to
whichever node it's given.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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