Add a package-aware file tree sidebar for multi-file tscircuit workspaces

[rushabhcodes]

What changed

This PR upgrades the Monaco workspace editor from a flat multi-file list into a package-aware editing experience for real tscircuit projects.

It adds:

• a collapsible file tree sidebar for nested workspace packages
• inline file create, rename, and delete actions
• hidden-file filtering for generated/config noise
• exported sidebar and tree primitives for library consumers
• a real multi-folder SparkFun board fixture plus RunFrame entrypoint resolution for end-to-end validation

Why

The existing workspace flow was workable for small demos, but it broke down on real tscircuit packages with nested folders, imported parts, and multiple source files. Editing larger boards required too much path-level context switching and made the standalone editor feel far behind the package UX users expect.

This change makes the editor significantly more usable for real project structures and closer to the workflow needed for multi-file circuit development.

Impact

• Improves workspace navigation and file management for multi-file packages
• Makes cross-file Monaco usage feel more like a real project editor
• Validates the UI against a non-toy board fixture instead of a trivial example
• Expands the reusable public API for hosts embedding the editor

Validation

• bun run typecheck
• bun run build

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Project	Deployment	Actions	Updated (UTC)
monaco-code-editor	Ready	Preview, Comment	Jun 29, 2026 9:23pm

[tscircuitbot]

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Thank you for your contribution! 🎉

PR Rating: ⭐⭐⭐
Impact: Major

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