fix(quotes): show real material names instead of category in accept modal & detail

Line-item labels in the accept modal («پروژهی هر قلم» and the keep/reject
list) and the quote-detail flow boxes printed category + brand (e.g. the
topic name). Both now use materialLabel() → the material's actual stored
name, consistent with the rest of the dashboard.

frontend/src/pages/Dashboard/AcceptModal.tsx

@@ -7,6 +7,7 @@ import {
   activeItems,
   itemTermsheetIds,
   materialById,
+  materialLabel,
   materialSpecs,
   specsLabel,
   supplierById,
@@ -313,7 +314,7 @@ export function AcceptModal({ quoteId, onClose }: AcceptModalProps) {
                     }}
                   />
                   <span className="flex-1 text-[13px]">
-                    {m.category} {m.brand}
+                    {materialLabel(m)}
                     {specText ? ` · ${specText}` : ""}
                   </span>
                   <span className="text-[12px] text-muted">
@@ -355,7 +356,7 @@ export function AcceptModal({ quoteId, onClose }: AcceptModalProps) {
                   <div key={li.id} className="rounded-lg border border-line p-2.5">
                     <div className="mb-1.5 text-[12.5px]">
                       <span className="font-semibold">
-                        {m.category} {m.brand}
+                        {materialLabel(m)}
                       </span>
                       {specText ? <span className="text-muted"> · {specText}</span> : ""}
                       <span className="ms-2 text-[11px] text-muted">