Turn app into a mini 2D platformer game

[tomadowley]

This PR rewires the app to run a small, canvas-based 2D platformer instead of the previous UI. It adds a new Game component and renders it from App.

What changed

• src/components/Game.tsx (new): A self-contained mini platformer implemented with a canvas. Features include:
  • Level with multiple platforms, gravity, friction, and collision handling
  • Player controls (A/D or arrows to move, W/Up/Space to jump)
  • A goal object; reaching it triggers a win state
  • Restart with R and a win overlay with a restart hint
  • Simple level generation based on canvas size
• src/App.tsx (updated): Now renders instead of the old PrimeChecker UI
• src/App.css (updated): Styling for the game container, title, and canvas wrapper to create a polished, game-like look (gradient backgrounds, rounded canvas panel)
• src/App.test.tsx (updated): Test now looks for the platformer heading to reflect the new UI

How it solves the issue

• Transforms the app into a lightweight 2D platformer by introducing a canvas-based game loop and basic physics, giving a functional and interactive game experience.
• Keeps the app self-contained with a clean separation between the game view and app shell, while preserving a simple and accessible control scheme.

Notes for maintainers

• The game currently uses a fixed canvas size (960x540) and a straightforward level. It can be extended with additional levels, more advanced physics, or features like enemies and collectibles without changing the component structure.

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This pull request was co-created with Cosine Genie

Original Task: sorbox/z9vpqjv4ywg8
Author: Tom Dowley

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Project	Deployment	Review	Updated (UTC)
sorbox	Ready	Preview, Comment	Jan 27, 2026 1:15pm

[tomadowley]

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