Fix gap between toasts

[embarc-gabriel]

Resolves: audacity/audacity#11723

We should not consider shadow height on item height calculation.
The current gaps is spacing + shadow height.

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Build configuration

audacity: audacity/audacity/master
audacity platforms: linux_x64
musescore: musescore/MuseScore/main
musescore platforms: linux_x64

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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Plan: Pro Plus

Run ID: ed4ad4d4-8865-4669-ad89-ae9bd862b303

📥 Commits

Reviewing files that changed from the base of the PR and between 07c98aa and 690d629.

📒 Files selected for processing (2)

• framework/toast/qml/Muse/Toast/ToastItem.qml
• framework/toast/qml/Muse/Toast/ToastProvider.qml

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📝 Walkthrough

Walkthrough

Toast items no longer expose shadowMargin. Their implicit height uses content height and vertical margins. The background no longer applies shadow-margin anchors. The toast list disables clipping.

Merge Risk: ⚪ Minimal · up to 690d6

This change adjusts toast item sizing so shadow height does not add extra gaps between toasts; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: correcting excessive spacing between toasts.
Description check	✅ Passed	The description includes the issue link, motivation, completed checklist, build configuration, and an appropriate explanation of the fix.
Linked Issues check	✅ Passed	The changes remove shadow height from toast sizing and address the excessive gap described in issue #11723.
Out of Scope Changes check	✅ Passed	Both modified files support the toast spacing fix, and no unrelated changes are present.
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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