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/unit/isValidCreateFlowSaveEmail.test.ts

@@ -0,0 +1,21 @@
+import { describe, it, expect } from "vitest";
+import { isValidCreateFlowSaveEmail } from "../../lib/create/isValidCreateFlowSaveEmail";
+
+describe("isValidCreateFlowSaveEmail", () => {
+  it("rejects empty, whitespace, and non-string values", () => {
+    expect(isValidCreateFlowSaveEmail("")).toBe(false);
+    expect(isValidCreateFlowSaveEmail("   ")).toBe(false);
+    expect(isValidCreateFlowSaveEmail(null)).toBe(false);
+    expect(isValidCreateFlowSaveEmail(undefined)).toBe(false);
+  });
+
+  it("rejects values the native email control would reject", () => {
+    expect(isValidCreateFlowSaveEmail("not-an-email")).toBe(false);
+    expect(isValidCreateFlowSaveEmail("user@example.com ")).toBe(false);
+    expect(isValidCreateFlowSaveEmail(" user@example.com")).toBe(false);
+  });
+
+  it("accepts a required type=email value", () => {
+    expect(isValidCreateFlowSaveEmail("user@example.com")).toBe(true);
+  });
+});