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/sections/HeroSimple.toHtml.test.ts

@@ -0,0 +1,35 @@
+import { describe, test, expect } from 'vitest';
+import { HeroSimple } from './HeroSimple';
+
+const toHtml = (HeroSimple as any).toHtml;
+
+describe('HeroSimple.toHtml textAlign enum sink (attacker-controlled prop, not enforced at runtime)', () => {
+  test('malicious textAlign value cannot break out of the content div style attribute', () => {
+    const { html } = toHtml({
+      heading: 'Hi',
+      subtitle: 'There',
+      textAlign: 'center;"><script>alert(1)</script>',
+    }, '');
+    expect(html).not.toContain('<script>alert(1)</script>');
+    expect(html).not.toContain('center;">');
+  });
+
+  test('unrecognized textAlign value falls back to a safe default rather than being echoed raw', () => {
+    const { html } = toHtml({ heading: 'Hi', subtitle: 'There', textAlign: 'not-a-real-value' as any }, '');
+    expect(html).not.toContain('text-align:not-a-real-value');
+  });
+
+  test('valid textAlign values are preserved', () => {
+    const { html: left } = toHtml({ heading: 'Hi', subtitle: 'There', textAlign: 'left' }, '');
+    expect(left).toContain('text-align:left');
+    const { html: right } = toHtml({ heading: 'Hi', subtitle: 'There', textAlign: 'right' }, '');
+    expect(right).toContain('text-align:right');
+  });
+
+  test('normal default render is sane', () => {
+    const { html } = toHtml({ heading: 'Welcome', subtitle: 'Sub text' }, '');
+    expect(html).toContain('Welcome');
+    expect(html).toContain('Sub text');
+    expect(html).toContain('text-align:center');
+  });
+});