feat(appshell): +aside in the storybook demo, +toggles

[FelixBlaisThon]

Proposed Changes

Added new controls in the storybook demo to collapse (or not) the Navigation or the Aside component of the Appshell

Screen.Recording.2026-10-06.at.1.23.36.PM.mov

Potential Breaking Changes

Acceptance Criteria

• The proposed changes are covered by unit tests
• The potential breaking changes are clearly identified
• A changeset is added for releasable changes, following CONTRIBUTING.md
• README.md is adjusted to reflect the proposed changes (if relevant)

[svcsnykcoveo]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.

[github-actions]

Release Preview

This PR would not change any package versions if it were merged and released from master.

[github-actions]

Live demo of your latest successful build available here:

• 📚 Storybook.

[Copilot]

Copilot review overview

🟡 Changes recommended

The new controls need complete metadata, and imports should consistently use the public package root.

Review effort: Balanced
Findings: 2

Open (2)

• Use the public root export for AppShell imports · New
• Add complete metadata and defaults for story-only controls · New

What changed in this PR

Adds AppShell Storybook controls for independently collapsing the navbar and aside.

Changes:

• Adds an aside with configurable width.
• Adds navbar and aside collapse toggles.
• Replaces a direct Mantine import with Plasma exports.

File	Description
packages/​storybook/​src/​components/​layout/​AppShell.stories.tsx	Expands the AppShell demo and controls.

---

💡 Configure MCP servers for context-aware, tailored reviews. Learn more in the docs.