refactor(repo): Improve sandbox layout

[alexcarpenter]

Description

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

🦋 Changeset detected

Latest commit: d00202a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 0 packages

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	May 20, 2026 9:11pm

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📝 Walkthrough

Walkthrough

This PR centralizes sandbox controls into a Tweakpane-powered initControls(), adds appearance/variable defaults, refactors routing into a declarative mountableRoutes map (including a shared mountOpenButton), and updates Clerk.load() to apply initial variables or theme with a variables-first fallback. The HTML template now unconditionally loads Tailwind 4, defines theme variables and dark-mode behavior, and replaces static sidebar links with a NavLink custom element.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
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 (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'refactor(repo): Improve sandbox layout' directly relates to the changeset, which refactors sandbox files (app.ts and template.html) to improve layout, routing, and theme/appearance handling.
Description check	✅ Passed	The PR description contains only the repository's standard template with no actual implementation details, but the title and changeset context indicate the PR is about sandbox improvements, making it sufficiently related.
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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commit: d00202a