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/basic/Logo.toHtml.test.ts

@@ -83,3 +83,12 @@ describe('Logo.toHtml text-logo styling sanitization', () => {
     expect(html).toContain('MySite');
   });
 });
+
+describe('Logo.toHtml design tokens (#44)', () => {
+  test('default export references var(--wsb-*) and no longer carries the old hard-coded hex', () => {
+    const { html } = toHtml({ text: "Acme" }, '');
+    const lower = html.toLowerCase();
+    for (const t of ["text"]) expect(html, `token ${t}`).toContain(`var(--wsb-${t})`);
+    for (const hex of ["#1f2937"]) expect(lower, `old ${hex}`).not.toContain(hex);
+  });
+});