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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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src/shared/capabilities.ts
+3 -2
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@@ -6,11 +6,12 @@ export type { PiWebCapability };
export const KNOWN_PI_WEB_CAPABILITIES = Object.values(PI_WEB_CAPABILITIES);
const knownPiWebCapabilities: ReadonlySet<string> = new Set(KNOWN_PI_WEB_CAPABILITIES);
export const WEB_RUNTIME_CAPABILITIES = [PI_WEB_CAPABILITIES.sessionsDeleteArchived] as const satisfies readonly PiWebCapability[];
export const SESSIOND_RUNTIME_CAPABILITIES = [PI_WEB_CAPABILITIES.sessionsDeleteArchived] as const satisfies readonly PiWebCapability[];
export const WEB_RUNTIME_CAPABILITIES = [PI_WEB_CAPABILITIES.sessionsDeleteArchived, PI_WEB_CAPABILITIES.promptAttachments] as const satisfies readonly PiWebCapability[];
export const SESSIOND_RUNTIME_CAPABILITIES = [PI_WEB_CAPABILITIES.sessionsDeleteArchived, PI_WEB_CAPABILITIES.promptAttachments] as const satisfies readonly PiWebCapability[];
const EFFECTIVE_CAPABILITY_REQUIREMENTS = {
[PI_WEB_CAPABILITIES.sessionsDeleteArchived]: ["web", "sessiond"],
[PI_WEB_CAPABILITIES.promptAttachments]: ["web", "sessiond"],
} as const satisfies Record<PiWebCapability, readonly PiWebServiceComponent[]>;
export function isPiWebCapability(value: unknown): value is PiWebCapability {