fix: chat accepts quotes now

internal/handler/chat.go

@@ -36,6 +36,8 @@ func writeChatError(w http.ResponseWriter, err error) {
 		response.Error(w, http.StatusNotFound, "conversation not found")
 	case errors.Is(err, service.ErrAvatarUnset):
 		response.Error(w, http.StatusNotFound, err.Error())
+	case errors.Is(err, service.ErrChatBadQuote):
+		response.Error(w, http.StatusBadRequest, err.Error())
 	case errors.Is(err, service.ErrChatBadAvatarKey):
 		response.Error(w, http.StatusBadRequest, err.Error())
 	case errors.Is(err, repository.ErrMessageNotHere):
@@ -186,7 +188,10 @@ type sendReq struct {
 	// when they dismissed it. Only the URL — never the card's contents.
 	PreviewURL  *string    `json:"preview_url"`
 	Attachments []mediaReq `json:"attachments"`
-	ReplyToID   *string    `json:"reply_to_id"`
+	// quote is a passage shared from the library. `path` must be app-relative;
+	// the service refuses anything that could navigate off-site.
+	Quote     *quoteReq `json:"quote"`
+	ReplyToID *string   `json:"reply_to_id"`
 	// forward_from_id is deliberately NOT accepted yet: forwarding lands with
 	// its own "can the caller see the source?" check in a later phase, and
 	// accepting an unvalidated message reference in the meantime would let a
@@ -210,11 +215,18 @@ func (h *ChatHandler) Send(w http.ResponseWriter, r *http.Request) {
 			FileName: a.FileName,
 		})
 	}
+	var quote *service.QuoteAttachment
+	if req.Quote != nil {
+		quote = &service.QuoteAttachment{
+			Path: req.Quote.Path, Title: req.Quote.Title, Text: req.Quote.Text,
+		}
+	}
 	msg, err := h.svc.Send(r.Context(), userID, convID, service.SendRequest{
 		Body:        req.Body,
 		ClientMsgID: req.ClientMsgID,
 		ReplyToID:   req.ReplyToID,
 		PreviewURL:  req.PreviewURL,
+		Quote:       quote,
 		Attachments: media,
 	})
 	if err != nil {
@@ -554,6 +566,12 @@ func (h *ChatHandler) UpdateGroup(w http.ResponseWriter, r *http.Request) {
 	response.NoContent(w)
 }
 
+type quoteReq struct {
+	Path  string `json:"path"`
+	Title string `json:"title"`
+	Text  string `json:"text"`
+}
+
 type receiptReq struct {
 	Seq int64 `json:"seq"`
 }