feat(stock): persist pricing draft to localStorage

src/app/(app)/stock/page.test.tsx

@@ -379,6 +379,30 @@ describe("StockListPage", () => {
     });
   });
 
+  describe("Stock list — localStorage draft persistence", () => {
+    beforeEach(() => {
+      _resetState();
+      _state.items = [
+        { id: "aaaaaaaaaaaaaaa", sku: "B-001", name: "M10 Hex Bolt", selling_price: 0, cost_price: 0, markup: 0, current_qty: 5, min_qty: 0, is_active: true, supplier: "" },
+      ];
+      window.localStorage.clear();
+    });
+    afterEach(() => cleanup());
+
+    it("survives a page remount via localStorage", async () => {
+      const { unmount } = render(<Page />);
+      await screen.findByText("M10 Hex Bolt");
+      fireEvent.click(screen.getByRole("button", { name: /Edit pricing/i }));
+      const costInput = await screen.findByLabelText(/Cost for B-001/i);
+      fireEvent.change(costInput, { target: { value: "1.23" } });
+      unmount();
+      render(<Page />);
+      await screen.findByText("M10 Hex Bolt");
+      fireEvent.click(screen.getByRole("button", { name: /Edit pricing/i }));
+      expect(await screen.findByText(/Apply changes/i)).toBeInTheDocument();
+    });
+  });
+
   describe("Stock list — missing-pricing-only filter", () => {
     beforeEach(() => {
       _resetState();

src/app/(app)/stock/page.tsx

@@ -156,6 +156,27 @@ export default function StockListPage() {
     window.localStorage.setItem("wfdash.stock.showPricing", String(showPricingColumns));
   }, [showPricingColumns]);
 
+  // Rehydrate draft from localStorage on mount.
+  useEffect(() => {
+    if (typeof window === "undefined") return;
+    try {
+      const raw = window.localStorage.getItem("wfdash.stock.pricingDraft");
+      if (raw) setPricingDraft(JSON.parse(raw));
+    } catch {
+      // ignore corrupt draft
+    }
+  }, []);
+
+  // Persist draft every change.
+  useEffect(() => {
+    if (typeof window === "undefined") return;
+    try {
+      window.localStorage.setItem("wfdash.stock.pricingDraft", JSON.stringify(pricingDraft));
+    } catch {
+      // localStorage quota — best-effort
+    }
+  }, [pricingDraft]);
+
   // Debounce the search input → 250ms after the last keystroke. Same
   // pattern as /orders and /quotes — the operator is hunting for a
   // match, not paging through.
@@ -250,6 +271,11 @@ export default function StockListPage() {
         Object.entries(pricingDraft).filter(([id]) => failedIds.has(id)),
       );
       setPricingDraft(failedDraftEntries);
+      if (failedIds.size === 0) {
+        window.localStorage.removeItem("wfdash.stock.pricingDraft");
+      } else {
+        window.localStorage.setItem("wfdash.stock.pricingDraft", JSON.stringify(failedDraftEntries));
+      }
       setPricingApplyState(failedIds.size > 0 ? "partial" : "applied");
       toast.success(
         failedIds.size > 0