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/vscode/src/skillsCatalog.ts

@@ -85,7 +85,7 @@ const CURATED_SOURCES: CuratedSource[] = [
   },
   {
     id: 'clawdhub',
-    label: 'ClawdHub',
+    label: 'ClawHub',
     description: 'Community skill registry with vector search',
     source: 'clawdhub:registry',
   },