Don't trigger layout when adding elements to note

[miiizen]

Resolves: #31166
This should be done before we reach Note::add eg. as part of an undo command.
When pasting, we added an accidental to a note belonging to a segment without a valid tick. This caused us to lay the score out from the beginning.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 536ee7d8-10cd-4136-8329-2c3b6a9a2baa

📥 Commits

Reviewing files that changed from the base of the PR and between 8225a96 and 315946c.

📒 Files selected for processing (1)

• src/engraving/dom/note.cpp

💤 Files with no reviewable changes (1)

• src/engraving/dom/note.cpp

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📝 Walkthrough

Walkthrough

Note::add() and Note::remove() no longer call triggerLayout() after modifying engraving items. Their item-added and item-removed callbacks remain unchanged.

Merge Risk: ⚪ Minimal · up to 31594

This localized change prevents unnecessary layout work when adding elements to notes; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description states the issue, motivation, and intended fix, but it omits the required repository checklist.	Add the template checklist and complete each item, including CLA, coding standards, testing, unnecessary changes, and test coverage.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the primary change: preventing layout triggers when adding elements to a note.
Linked Issues check	✅ Passed	The change directly supports issue #31166 by preventing unnecessary layout during accidental paste operations in large scores.
Out of Scope Changes check	✅ Passed	The changes are limited to removing layout triggers from Note::add and Note::remove, which matches the linked issue objective.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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🔥 Problems

Linked repositories: Public OSS repositories can only analyze public repositories installed in this organization. No linked repositories were analyzed; skipped musescore/muse_framework.git.

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