fix(catalog): show real material names, not categories, across quote views

New shared materialLabel() renders the global materials.name with brand/specs
appended only when not already part of the name (deduped; «؟» fallback kept).
Replaces the category-first composer in five places: supplier card badges
(CategoryPage), dashboard item lines (QuoteCard), ledger items summary,
project rows and purchase history. Also fixes the stale Units subtitle
«ضریب تبدیل همان دسته» → «ضریب تبدیل متریال» (category model kept).

frontend/src/pages/Suppliers/PurchaseHistory.tsx

@@ -3,7 +3,7 @@ import { Link } from "react-router-dom";
 import { Building2, Paperclip, Plus } from "lucide-react";
 import type { Attachment, Material, Quote, Supplier } from "../../lib/types";
 import { api } from "../../lib/api";
-import { activeItems, materialById, materialSpecs, quoteTotal, specsLabel } from "../../lib/quoteUtils";
+import { activeItems, materialById, materialLabel, quoteTotal } from "../../lib/quoteUtils";
 import { fmtDate, faNum } from "../../lib/formatters";
 import { groupCommas } from "../../lib/numutil";
 import { STATUS_LABEL } from "../../lib/constants";
@@ -85,8 +85,7 @@ export function PurchaseHistory({ supplier, quotes, materials }: PurchaseHistory
       {purchases.map((q) => {
         const items = activeItems(q).map((li) => {
           const m = materialById(materials, li.material_id);
-          const specs = materialSpecs(m);
-          return `${m.category} ${m.brand}${specs.length ? " " + specsLabel(specs) : ""}`.trim();
+          return materialLabel(m);
         });
         const total = quoteTotal(q);
         const attach = attachments[q.id];