fix(wizard): store material name cleanly instead of brand+category+specs

Adding a new item wrote the material name as 'brand + category + specs'
(e.g. 'پارس لوله لوله PE100 سایز ۱۶'), while specs were also stored
correctly in EAV attributes. The wizard then tried to recover the base
name by stripping brand and specs out of that string, but never stripped
the injected category — so the spec stayed baked into the cached material
name and the مشخصه appeared as part of the material name on later visits.

- api.ts / WizardPage / EditModal: build name from the material itself
  only (brand goes to brand_ids, specs to attributes)
- materialBaseName: strip category too, never strip a part that would
  empty the name, and reject a spec-only result; legacy rows whose name
  cannot be disentangled fall back to the stored name rather than a guess
- WizardPage: match existing materials on category+brand so legacy rows
  are still reused instead of duplicated

frontend/src/pages/Wizard/WizardPage.tsx

@@ -128,7 +128,7 @@ export function WizardPage() {
   const rememberMaterial = (rec: MaterialRec) => {
     void addMaterial.mutateAsync({
       id: nextId("m", materials),
-      name: [rec.brand, rec.category, ...rec.specs].filter(Boolean).join(" ") || "کالای جدید",
+      name: (rec.category || rec.brand || rec.specs.join(" ") || "").trim() || "کالای جدید",
       topic: rec.topic,
       category: rec.category,
       brand: rec.brand,
@@ -243,7 +243,7 @@ export function WizardPage() {
       const total = it.total;
       if (!cat && !brand && qty == null && price == null) continue;
 
-      const wantName = [brand, cat, ...specs].filter(Boolean).join(" ") || "کالای جدید";
+      const wantName = (cat || brand || specs.join(" ") || "").trim() || "کالای جدید";
       let material = materials.find((m) => normalize(m.name) === normalize(wantName));
       if (!material) {
         material = materials.find(
@@ -253,6 +253,13 @@ export function WizardPage() {
             specsKey(m.specs) === specsKey(specs),
         );
       }
+      // رکوردهای قدیمی name را به شکل «برند + دسته + مشخصه» ذخیره کرده‌اند؛
+      // تطبیق دوم بر اساس category/brand/specs انجام می‌شود تا آن‌ها هم پیدا شوند.
+      if (!material && cat) {
+        material = materials.find(
+          (m) => normalize(m.category) === normalize(cat) && normalize(m.brand) === normalize(brand),
+        );
+      }
       let materialId: string;
       if (material) {
         materialId = material.id;