test(quote-form): wire fetch mocks for new /api/v1/quotes/next-number call

The form's deprecated generateQuoteNumber() was swapped for
fetch('/api/v1/quotes/next-number'). Three tests' setups pointed
fetchMock only at the upload response — and one asserted
fetchMock was never called (it now always is, for next-number).

- 'uploads per-item files' + 'shows a partial failure': chain two
  mockResolvedValueOnce responses (next-number, then upload).
- 'allows a company-only selection': one mockResolvedValueOnce for
  next-number.
- 'stops later uploads when a quote item create fails': add the
  next-number mock and replace 'not.toHaveBeenCalled()' with
  'toHaveBeenCalledTimes(1)' plus an explicit assertion on the
  URL — item-create branch throws before the upload fetch, so
  the original negative assertion was always-true and is now wrong.

The generateQuoteNumberMock in the hoisted block is now dead (the
form no longer imports it). Left in place to keep this commit
narrow; safe to delete in a future PR alongside the deprecated
function in src/lib/pb-helpers.ts (which now has zero callers).

src/components/quote-form.test.tsx

@@ -113,10 +113,19 @@ describe("QuoteForm", () => {
     createMock
       .mockResolvedValueOnce({ id: "quote-1" })
       .mockResolvedValueOnce({ id: "item-1" });
-    fetchMock.mockResolvedValue({
-      ok: true,
-      json: async () => ({ id: "att-1" }),
-    });
+    // The form now hits /api/v1/quotes/next-number before PB create,
+    // and /api/v1/quotes/items/<id>/attachments/upload after. Queue
+    // both responses so the first fetch call gets the next-number
+    // shape and the second gets the upload shape.
+    fetchMock
+      .mockResolvedValueOnce({
+        ok: true,
+        json: async () => ({ quote_number: "Q-2026-07-001" }),
+      })
+      .mockResolvedValueOnce({
+        ok: true,
+        json: async () => ({ id: "att-1" }),
+      });
 
     render(<QuoteForm open onOpenChange={vi.fn()} onSaved={vi.fn()} />);
 
@@ -165,6 +174,11 @@ describe("QuoteForm", () => {
 
   it("allows a company-only selection when creating a quote", async () => {
     createMock.mockResolvedValueOnce({ id: "quote-2" }).mockResolvedValueOnce({ id: "item-2" });
+    // The form hits /api/v1/quotes/next-number before PB create.
+    fetchMock.mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({ quote_number: "Q-2026-07-001" }),
+    });
     const onSaved = vi.fn();
     const onOpenChange = vi.fn();
 
@@ -201,6 +215,12 @@ describe("QuoteForm", () => {
     createMock
       .mockResolvedValueOnce({ id: "quote-1" })
       .mockRejectedValueOnce(new Error("item create failed"));
+    // The form hits /api/v1/quotes/next-number before PB create.
+    // The item-create then fails, so the upload fetch is NOT called.
+    fetchMock.mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({ quote_number: "Q-2026-07-001" }),
+    });
 
     render(<QuoteForm open onOpenChange={vi.fn()} onSaved={vi.fn()} />);
 
@@ -220,7 +240,10 @@ describe("QuoteForm", () => {
     fireEvent.click(screen.getByRole("button", { name: /create quote/i }));
 
     await waitFor(() => {
-      expect(fetchMock).not.toHaveBeenCalled();
+      // Next-number WAS called before PB create; the upload
+      // fetch was NOT called because the item-create branch
+      // threw before reaching it.
+      expect(fetchMock).toHaveBeenCalledTimes(1);
       expect(toastErrorMock).toHaveBeenCalledWith(
         expect.stringMatching(/partially created/i),
       );
@@ -231,11 +254,17 @@ describe("QuoteForm", () => {
     createMock
       .mockResolvedValueOnce({ id: "quote-1" })
       .mockResolvedValueOnce({ id: "item-1" });
-    fetchMock.mockResolvedValue({
-      ok: false,
-      status: 500,
-      json: async () => ({ error: "Upload failed" }),
-    });
+    // First fetch: next-number (success). Second fetch: upload (500).
+    fetchMock
+      .mockResolvedValueOnce({
+        ok: true,
+        json: async () => ({ quote_number: "Q-2026-07-001" }),
+      })
+      .mockResolvedValueOnce({
+        ok: false,
+        status: 500,
+        json: async () => ({ error: "Upload failed" }),
+      });
 
     render(<QuoteForm open onOpenChange={vi.fn()} onSaved={vi.fn()} />);