UI: Hide addon panel Drag on pages without a panel

[Sidnioulz]

10.3 QA bugfix: Ensures the addon panel's resize drag is hidden on Docs or settings pages where there cannot be an addon panel.

The showPanel logic used to be true when the panel was 0px, making it unsuitable at the time to decide when to hide or show the Drag handle. Now, it only is true when the panel effectively must not be showable at all; so it's safe to use to also hide the Drag.

Manual testing

1. Visit http://localhost:6006/?path=/settings/about
2. Tab all the way to the bottom of the page content
3. Keep tabbing and notice no resize handle shows up

Summary by CodeRabbit

• Refactor
  • Optimized panel rendering logic in desktop layout for improved performance.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit b2f06b9

Command	Status	Duration	Result
nx run-many -t compile -c production --parallel=1	✅ Succeeded	4m 38s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-03-16 18:40:57 UTC

[nx-cloud]

View your CI Pipeline Execution ↗ for commit b2f06b9

Command	Status	Duration	Result
nx run-many -t compile -c production --parallel=1	✅ Succeeded	4m 38s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-03-16 18:34:20 UTC

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e7891585-fe99-46c0-adb2-4bf5d62e7d49

📥 Commits

Reviewing files that changed from the base of the PR and between 546aece and b2f06b9.

📒 Files selected for processing (1)

• code/core/src/manager/components/layout/Layout.tsx

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📝 Walkthrough

Walkthrough

Refactors the render gate for PanelContainer in desktop view by moving the showPanel check from inside the component's children to the outer conditional. PanelContainer now renders only when both isDesktop and showPanel are true, eliminating a redundant guard inside.

Changes

Cohort / File(s)	Summary
Panel Container Render Gate Refactoring code/core/src/manager/components/layout/Layout.tsx	Moved showPanel condition to outer render gate for PanelContainer; removed redundant showPanel check inside PanelContainer's children, simplifying conditional logic for desktop panel visibility.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• Tests: Fix Layout story unduly failing #34072: Modifies PanelContainer and slotPanel rendering behavior in desktop view, directly related to this render gate refactoring.
• UI: Keep preview frame stable in overall layout #33447: Changes PanelContainer rendering logic and the same isDesktop && showPanel conditional pattern.
• UI: Allow showing or hiding the addon panel #32348: Introduces API-driven showPanel logic that is now being leveraged in this render gate optimization.

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

📝 Coding Plan

• Generate coding plan for human review comments

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