7a0fb2ca97b0197d1146fb34db615c9c4e750274
- useMessages exposes upload(); Thread gains a hover reaction picker (react to a message) and an attach button (upload → stage → send), plus inline image / file rendering of message attachments — all capability-degrading (hidden when the adapter lacks react/upload) - themeable styles for the picker, attach button, staged chip, and attachments - 57 tests still green Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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