Both were the defect the new hook exists for. The sidebar's Claude terminal
button is disabled whenever the container is not running and never said so —
its `title` names the action, so the precondition appeared nowhere in the
accessibility tree at all. Add Project's submit button is disabled while an
add is in flight, and its only signal is the label swapping to "Adding…" on
an element a screen reader can no longer reach.
The submit button needs a second guard the hook cannot supply: Enter inside
a text field submits a form without touching the submit button, so
`handleSubmit` now returns early while loading. Without it, swapping
`disabled` for `aria-disabled` would have turned an accessibility fix into a
double-submit bug.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011YPqHpjV4EL6RNEwrRKqQm
