fix(edit-modal): restore the proforma upload section

The proforma FileList existed in prod_v5 (a181a87) but was dropped when the
prod_v2 EditModal redesign (de177f3) was merged — that branch predates the
feature and its version of the file was taken wholesale to keep the new
tabbed layout, silently discarding the proforma block.

Restores the state, the load effect, the saved patch field and the upload
UI (on the تاریخ tab, next to the invoice card), using the current
authenticated download/preview helpers rather than the removed urlOf.

frontend/src/pages/Dashboard/EditModal.tsx

@@ -86,6 +86,7 @@ export function EditModal({ quoteId, onClose }: EditModalProps) {
   const [selectedProjects, setSelectedProjects] = useState<string[]>([]);
   const [notes, setNotes] = useState("");
   const [invoices, setInvoices] = useState<Attachment[]>([]);
+  const [proformas, setProformas] = useState<Attachment[]>([]);
   const [itemRows, setItemRows] = useState<EditItemRow[]>([]);
   const [tsCards, setTsCards] = useState<EditTsCard[]>([]);
   const [quoteDate, setQuoteDate] = useState<string | null>(null);
@@ -189,6 +190,10 @@ export function EditModal({ quoteId, onClose }: EditModalProps) {
       .list(quoteId, "invoice")
       .then((list) => alive && setInvoices(list))
       .catch(() => alive && setInvoices([]));
+    void api.files
+      .list(quoteId, "proforma")
+      .then((list) => alive && setProformas(list))
+      .catch(() => alive && setProformas([]));
     return () => {
       alive = false;
     };
@@ -314,6 +319,7 @@ export function EditModal({ quoteId, onClose }: EditModalProps) {
     next.projects = [...selectedProjects];
     next.notes = notes.trim();
     next.invoices = invoices;
+    next.proformas = proformas;
 
     const tsIdMap: Record<string, string> = {};
     const newTermsheets: Termsheet[] = [];
@@ -865,6 +871,25 @@ export function EditModal({ quoteId, onClose }: EditModalProps) {
                     loadPreview={(a) => api.files.previewUrl(q.id, "invoice", a.id!)}
                   />
                 </div>
+
+                {/* پیش‌فاکتورها — در همه‌ی مراحل چرخه‌ی پیشنهاد قابل افزودن/ویرایش است */}
+                <div className="rounded-xl border border-gray-200 bg-white p-3.5 sm:p-4 space-y-2 shadow-xs">
+                  <div className="text-xs font-bold text-gray-900">پیش‌فاکتورها</div>
+                  <FileList
+                    files={proformas}
+                    onChange={setProformas}
+                    upload={(f) => api.files.upload(q.id, "proforma", f)}
+                    onDelete={(a) =>
+                      a.id &&
+                      void api.files.remove(q.id, "proforma", a.id).catch((err) =>
+                        toast.error(err instanceof Error ? err.message : "حذف پیش‌فاکتور ناموفق بود"),
+                      )
+                    }
+                    onDownload={(a) => api.files.download(q.id, "proforma", a.id!, a.name)}
+                    loadPreview={(a) => api.files.previewUrl(q.id, "proforma", a.id!)}
+                    label="افزودن پیش‌فاکتور"
+                  />
+                </div>
               </div>
             )}
           </div>