fix(builder): escape/allowlist all attribute-value sinks incl. numeric/enum props (XSS)

An adversarial pass found 5 Critical XSS sinks where props declared number/enum
in TypeScript were interpolated raw into exported HTML attribute values,
trusting the type — but nothing enforces it at runtime (AI update_props only
validates node_id; deserialized saved state is untyped JSON). Fixed all 5
(NumberCounter data-target, StarRating aria-label, FormContainer method,
ContactForm/InputField input type) plus 6 sibling sinks found by an exhaustive
audit of every attribute-value interpolation across src/components: a
JS-source injection into ContentSlider's inline setInterval script, a
prototype-pollution-adjacent allowlist gap in Section's divider-shape lookup,
TextareaField rows, Testimonials rating aria-label, HeroSimple textAlign, and
MapEmbed zoom. Adds shared sanitizeFormMethod/sanitizeInputType allowlist
helpers to utils/escape.ts alongside the existing escapeAttr/safeUrl/cssValue
primitives. Every fix is TDD'd: a malicious-value test reproduces the raw
injection against the pre-fix code, then passes after the fix.

502 tests green (npx vitest run), tsc + vite build green (npm run build).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

craft/src/components/forms/InputField.toHtml.test.ts

@@ -58,3 +58,17 @@ describe('InputField.toHtml deterministic + unique ids (thread node id, resolves
     expect(id1).toBe(id2);
   });
 });
+
+describe('InputField.toHtml type attribute sanitization', () => {
+  test('malicious type value cannot break out of the attribute; falls back to type="text"', () => {
+    const { html } = toHtml({ label: 'Name', name: 'name', type: 'text" autofocus onfocus="alert(1)' as any }, '');
+    expect(html).not.toContain('onfocus=');
+    expect(html).not.toContain('autofocus');
+    expect(html).toContain('type="text"');
+  });
+
+  test('legitimate number type still passes through unchanged', () => {
+    const { html } = toHtml({ label: 'Age', name: 'age', type: 'number' as const }, '');
+    expect(html).toContain('type="number"');
+  });
+});