Improve parenthesis layout performance

[miiizen]

This PR makes layout of parentheses quicker by reducing the number of rectangles in their shape. This cuts segment spacing time in a parenthesis-heavy test score by ~75% (10s to 2.5s)

[claude]

Claude Code Review

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

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Run ID: ef7fe037-2e05-46e2-800f-ee22a4f8e6cd

📥 Commits

Reviewing files that changed from the base of the PR and between 7aa1829 and cbaaef9.

📒 Files selected for processing (1)

• src/engraving/rendering/score/parenthesislayout.cpp

🚧 Files skipped from review as they are similar to previous changes (1)

• src/engraving/rendering/score/parenthesislayout.cpp

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📝 Walkthrough

Walkthrough

This change reduces the discretization used when generating filled composite parenthesis shapes: nbShapes is now round(2.0 * heightInSpatium) clamped to 3..10 instead of round(5.0 * heightInSpatium) clamped to 20..50, producing fewer shape segments in the fill loop.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description lacks required sections from the template including issue reference, CLA checkbox, and commit message verification checklist.	Add the missing template sections: issue reference (Resolves: #NNNNN), CLA checkbox, and verification checklist items.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: reducing parenthesis layout computation complexity to improve performance.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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