[Visual Learning] Implement remaining LeetCode pattern games

[pertrai1-bot]

We have successfully built the first learning game for Topological Sort ('Locker Room Gear-Up'). We need to implement the remaining three interactive games inside the visual-learning folder:

1. Sliding Window ('The Quarterback's Viewfinder') - Teach context window management and parsing.
2. Priority Queue / Heap ('The Fantasy Draft Board') - Teach top-K vector search / RAG retrieval.
3. Two Pointers ('The Loop Detective') - Teach infinite loop and cycle detection.

Each game should be a pure, self-contained HTML/CSS/JS file inside its own subdirectory under visual-learning/ following the same tycoon-style aesthetic and audio synthesis model.