- Paperclip icon left of text input, file preview pill (image thumb or file icon)
- Conversation list shows attachment icon right of trash, opens gallery overlay
- Gallery overlay: scrollable, close (X), delete attachment per item
- DELETE /api/upload/{id} removes from SQLite + Qdrant
- PATCH /api/upload/{id}/link ties upload to conversation
- GET /api/upload/by-conversation/{id} lists attachments
- Chat accepts upload_context_id, injects [ATTACHED DOCUMENT] into system prompt
- Conversation list includes attachment_count field
- 8 new tests: upload context injection, delete, link, by-conversation, image type, attachment count
Still missing (P3): drag-and-drop upload, global attachments page, file download, batch upload
Replace the hover-reveal × on the right with an always-visible 🗑 icon
positioned to the left of the conversation title. Clicking it triggers
the existing deleteConversation() which shows a confirm dialog and
enforces admin-only access.