Give builder fields persistent labels, treat description as optional, and validate save-progress email with a real form.

Name stays required; description is a labelled optional textarea. Email uses native validity and form submit. Drop the dead workshop link and fix a few copy errors.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/components/CommunityStructureSelectScreen.test.tsx

@@ -11,6 +11,9 @@ describe("CommunityStructureSelectScreen", () => {
     expect(screen.getByText("Organization Type")).toBeInTheDocument();
     expect(screen.getByText("Scale")).toBeInTheDocument();
     expect(screen.getByText("Maturity")).toBeInTheDocument();
+    expect(
+      screen.getByText(/Choose tags that describe your community/i),
+    ).toBeInTheDocument();
     expect(screen.queryByAltText("Help")).not.toBeInTheDocument();
   });
 });