Fix ClawHub display name typo in Skills Catalog (#2895)

The Skills Catalog source dropdown showed "ClawdHub"; the registry brands
itself as ClawHub. Update curated/fallback labels across web, UI, and VS Code,
align docs, and add regression tests.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

packages/web/server/lib/skills-catalog/curated-sources.test.js

@@ -0,0 +1,10 @@
+import { describe, expect, it } from 'vitest';
+import { getCuratedSkillsSources } from './curated-sources.js';
+
+describe('getCuratedSkillsSources', () => {
+  it('labels the ClawHub curated source as ClawHub', () => {
+    const clawhub = getCuratedSkillsSources().find((source) => source.id === 'clawdhub');
+    expect(clawhub).toBeDefined();
+    expect(clawhub.label).toBe('ClawHub');
+  });
+});