feat(site-builder): tokenise colours hard-coded inside components

Component render/toHtml now use var(--wsb-*) instead of hex so Site Design
palette changes reach FeaturesGrid, Testimonials, Accordion, PricingTable,
CTA/CallToAction, forms, Gallery, Tabs and others. Exemption lists removed.

Refs #44

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

craft/src/components/sections/NumberCounter.toHtml.test.ts

@@ -94,3 +94,12 @@ describe('NumberCounter.toHtml palette token fallbacks (Refs #44)', () => {
     expect(html).not.toContain('#6b7280');
   });
 });
+
+describe('NumberCounter.toHtml design tokens (#44)', () => {
+  test('default export references var(--wsb-*) and no longer carries the old hard-coded hex', () => {
+    const { html } = toHtml({ counters: [{ number: 1, suffix: '+', label: 'L' }] }, '');
+    const lower = html.toLowerCase();
+    for (const t of ["bg"]) expect(html, `token ${t}`).toContain(`var(--wsb-${t})`);
+    for (const hex of ["#ffffff"]) expect(lower, `old ${hex}`).not.toContain(hex);
+  });
+});