⚡ Bolt: Refactor HomePage to isolate User Dashboard updates

[google-labs-jules]

💡 What: Extracted UserDashboard component from HomePage.tsx and moved useGamification and useProgress hooks into it.
🎯 Why: HomePage was re-rendering all static content (Hero, Features, Worlds Preview) whenever gamification or progress data loaded or updated, which happens frequently (loading states, background syncs).
📊 Impact: Reduces DOM diffing and re-renders for the heavy static sections of the landing page for logged-in users.
🔬 Measurement: Verified that HomePage imports are cleaner and the Guest view still works as expected (via Playwright). Logic is preserved.

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PR created automatically by Jules for task 11127445767854311156 started by @albertoivo

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