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feat: add image attachments to the chat composer

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Support pasting (Ctrl/Cmd+V), drag-and-drop, and an Attach button to add
PNG/JPEG/GIF/WebP images to a message, with thumbnail previews and
multi-image support.

Attachments are delivered to the session using pi's native ImageContent
format and are run through pi's own resizeImage so they match pi's inline
image limits exactly. Image content now renders inline in the transcript.

A per-message delivery toggle also lets users save attachments into the
workspace `.pi-web/paste` folder and reference them so the agent reads
them with its own tools.

The accepted HTTP upload size is configurable via PI_WEB_MAX_UPLOAD_BYTES
or the maxUploadBytes config value (default 64 MB).

Closes #13
This commit is contained in:
Federico Jaramillo Martinez
2026-06-13 13:49:39 +02:00
parent 847510e240
commit d17050e144
29 changed files with 776 additions and 46 deletions
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README.md
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@@ -272,6 +272,7 @@ Environment variables:
- `PI_WEB_SESSIOND_URL` — daemon URL used by the web process when connecting over TCP, for example `http://127.0.0.1:3001`. If you set `PI_WEB_SESSIOND_PORT`, set this for the web process too.
- `PI_WEB_PROJECTS_FILE` — optional override for the projects storage JSON file. Defaults to `$PI_WEB_DATA_DIR/projects.json`.
- `PI_WEB_MACHINES_FILE` — optional override for the remote machine registry JSON file. Defaults to `$PI_WEB_DATA_DIR/machines.json`.
- `PI_WEB_MAX_UPLOAD_BYTES` — maximum accepted HTTP request body size in bytes (covers pasted/attached images). Defaults to 64 MB. Also configurable as `maxUploadBytes` in `config.json`.
- `PI_CODING_AGENT_SESSION_DIR` — Pi session storage directory. PI WEB follows the same session-location priority as Pi for web sessions: this environment variable, then `sessionDir` in Pi settings for the selected workspace, then Pi's default session directory.
- `PI_CODING_AGENT_DIR` — Pi agent config directory. PI WEB uses this for Pi auth, settings, resources, and default session storage, matching Pi's own configuration layout.