tokens: isTokenRef accepts brand token names (digits)

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

craft/src/utils/swatches.test.ts

@@ -111,3 +111,11 @@ describe('list operations', () => {
     expect(findSwatchByHex(l, '#000')).toBeUndefined();
   });
 });
+
+describe('isTokenRef accepts brand refs (digits in the name)', () => {
+  test('brand refs are token refs but not fixed-slot keys', async () => {
+    const { isTokenRef, tokenKeyOf } = await import('./tokens');
+    expect(isTokenRef('var(--wsb-brand-2)')).toBe(true);
+    expect(tokenKeyOf('var(--wsb-brand-2)')).toBeNull();
+  });
+});

craft/src/utils/tokens.ts

@@ -64,7 +64,7 @@ export const COLOR_TOKENS: ReadonlyArray<{ key: TokenKey; label: string }> = [
   { key: 'error', label: 'Error' },
 ];
 
-const TOKEN_REF_RE = /^var\(--wsb-([a-z-]+)\)$/;
+const TOKEN_REF_RE = /^var\(--wsb-([a-z0-9-]+)\)$/;
 
 // TokenKey -> SiteDesign key, derived from TOKEN_VARS so there is one source.
 const DESIGN_KEY_BY_TOKEN = new Map<string, keyof SiteDesign>(