Textarea props (placeholder, rows, disabled), popup not shown
initially, popup opens on @ + query, empty results from API,
HTTP error → empty popup, Enter submits when popup closed,
Shift+Enter does not submit, Escape closes popup, Arrow{Up,Down}
navigation, Enter with no results.
12 tests covering ~30 branches in MentionEditor.
Refs #496.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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