fix(vendor-portal): state the 10 MB PDF cap in the upload hint

The vendor portal hint listed the photo and video limits but not the PDF one, so a vendor rejected for an 11 MB PDF saw a limit that was never stated. PDFs are the only accepted kind whose cap was missing from the copy; a test now pins the full hint.

src/app/v/_components/vendor-portal-documents.tsx

@@ -203,7 +203,7 @@ export function VendorPortalDocuments({
           </button>
           <span className="vp-hint">
             Accepted: PDF, JPG, PNG, HEIC, MP4, MOV · Photos up to 10 MB · Videos up to 100 MB and
-            90 s
+            90 s · PDFs up to 10 MB
           </span>
         </div>
       )}

src/test/app/v/vendor-portal-documents.test.tsx

@@ -109,6 +109,16 @@ describe("VendorPortalDocuments", () => {
         target: { files: [file] },
       });
 
+    it("states the limit for every accepted kind, including PDFs", () => {
+      renderDocuments();
+
+      expect(
+        screen.getByText(
+          "Accepted: PDF, JPG, PNG, HEIC, MP4, MOV · Photos up to 10 MB · Videos up to 100 MB and 90 s · PDFs up to 10 MB",
+        ),
+      ).toBeInTheDocument();
+    });
+
     it("uploads a ~60 MB phone MOV whose browser type is empty", async () => {
       vi.mocked(probeVideoDurationSeconds).mockResolvedValue(null);
       const upload = vi