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chat_web_app/llm-fe
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Vision: attach an image with a prompt and have the model read it (#129)
## Summary
- Closes #128.
- Chat composer accepts PNG, JPEG, WebP, and GIF along with existing documents.
- Selected image shows a thumbnail before send. Filename stays hidden for images. Documents still show the filename.
- User turn keeps the image after reload, from the prompt `image` field the backend returns.
- Oversized or unsupported images show the websocket error on the assistant bubble.
- Landing copy and `llms.txt` no longer list vision as roadmap-only.

Needs the matching `chat_backend` branch `feat/128-vision-image-prompt` so the model actually reads the image.

## Test plan
- [ ] Attach a PNG with a prompt that asks to read text in the image. Answer uses the picture.
- [ ] Thumbnail shows before send, with no filename.
- [ ] Reload the conversation. The image is still on the user turn.
- [ ] CSV/PDF attach still works.
- [ ] Text-only prompt unchanged.
- [ ] A BMP or an image over 8 MB shows an error instead of a silent failure.

Reviewed-on: #129
2026-10-20 06:13:42 -07:00
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