fix: chat accepts quotes now

lib/chat.ts

@@ -168,7 +168,8 @@ export type AttachmentKind =
   | "audio"
   | "file"
   | "link"
-  | "entity";
+  | "entity"
+  | "quote";
 
 export type Attachment = {
   id: string;
@@ -259,6 +260,7 @@ export const chat = {
       replyToId?: string;
       previewUrl?: string;
       attachments?: UploadedAttachment[];
+      quote?: QuotePayload;
     },
   ) =>
     call<ChatMessage>(`/chat/conversations/${conversationId}/messages`, {
@@ -270,6 +272,7 @@ export const chat = {
         // Only the URL: the BFF fetches the card's contents itself.
         preview_url: opts?.previewUrl ?? null,
         attachments: opts?.attachments ?? [],
+        quote: opts?.quote ?? null,
       }),
     }),
 
@@ -399,6 +402,19 @@ export const chat = {
 };
 
 /** A file already uploaded to the private bucket, ready to attach on send. */
+/**
+ * A passage shared from the library.
+ *
+ * `path` is app-relative on purpose — the BFF refuses anything absolute or
+ * protocol-relative, because a quote renders as trusted in-app content and
+ * must not be able to carry the reader off-site.
+ */
+export type QuotePayload = {
+  path: string;
+  title: string;
+  text: string;
+};
+
 export type UploadedAttachment = {
   key: string;
   mime: string;