Improve test coverage for uncovered UI formatting and Bloch scene branches

[Copilot]

This updates the test suite to cover branches that were previously untested despite full statement coverage, focusing on coefficient formatting in the controls UI and interaction edge cases in the Bloch scene hook.

• Control panel coefficient rendering

  • Added targeted tests for DesktopControls and MobileControls when amplitudes have negative real parts.
  • Covers the branch that toggles the real-sign placeholder vs. a visible - sign, which was previously unexercised.

• Bloch scene interaction coverage

  • Extended useBlochScene tests to cover wheel zoom clamping at the upper bound.
  • Keeps the existing interaction-focused approach while exercising an untested branch in camera radius updates.

• Coverage outcome

  • Brings desktop-controls.tsx and mobile-controls.tsx branch coverage to 100%.
  • Improves overall branch coverage without changing runtime behavior.

render(
  <DesktopControls
    {...createProps({
      quantumState: new QuantumState(
        new Complex(-1, 2),
        new Complex(-3, -4),
      ),
    })}
  />
)

expect(screen.getByTestId('a-value')).toHaveTextContent('-1.0000+2.0000i')
expect(screen.getByTestId('b-value')).toHaveTextContent('-3.0000-4.0000i')

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Project	Deployment	Actions	Updated (UTC)
bloch	Ready	Preview, Comment, Open in v0	Apr 4, 2026 4:34am

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.24%. Comparing base (46aba14) to head (03ef8d6).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   98.74%   99.24%   +0.50%     
==========================================
  Files          14       14              
  Lines         398      398              
  Branches       60       60              
==========================================
+ Hits          393      395       +2     
+ Partials        5        3       -2     

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