Add coverage for useBlochScene hook behavior

[Copilot]

hooks/use-bloch-scene.ts had no direct test coverage despite owning non-trivial scene lifecycle and interaction logic. This adds focused hook tests around initialization, prop-driven updates, and teardown behavior.

• Hook lifecycle coverage

  • Adds a dedicated use-bloch-scene.test.tsx suite for the hook.
  • Verifies the scene mounts a renderer, initializes the camera, and applies the expected background color.

• Interaction and state update coverage

  • Exercises camera movement via input events and verifies resetCamera restores the default view.
  • Verifies window resize updates renderer dimensions and camera aspect ratio.
  • Verifies quantumState changes replace the rendered Bloch vector.
  • Verifies isDarkMode changes regenerate label textures and update the scene background.

• Cleanup coverage

  • Verifies unmount removes DOM listeners, cancels animation, detaches the canvas, and disposes renderer resources.

Example of the behavior now covered:

const { rerender } = render(
  <TestComponent isDarkMode quantumState={initialState} />,
)

rerender(
  <TestComponent isDarkMode={false} quantumState={nextState} />,
)

This captures the two core update paths in the hook: scene restyling on theme changes and vector replacement on quantum state changes.

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Project	Deployment	Actions	Updated (UTC)
bloch	Ready	Preview, Comment, Open in v0	Apr 3, 2026 0:04am

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.16%. Comparing base (b8e8063) to head (6cdbc83).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##              main      #18       +/-   ##
============================================
- Coverage   100.00%   80.16%   -19.84%     
============================================
  Files            8       12        +4     
  Lines           63      373      +310     
  Branches        11       52       +41     
============================================
+ Hits            63      299      +236     
- Misses           0       58       +58     
- Partials         0       16       +16     

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