When a user adds a folder from their computer that uses hyphens as a workspace, the user is unable to save files to the workspace

Start by reproducing the save failure with a hyphenated local folder through the File System Access API, recording the actual browser and OS behavior. Review nameToMountPath() in workspaceManagerHelpers.ts, resolveMount() in CompositeFileSystem.ts, and the existing hyphenated-path tests. Done means the failure is explained and fixed, a regression test covers hyphenated workspace names, and existing tests pass.

Problem

When a user adds a local folder (via File System Access API) that contains hyphens in its name (e.g., my-project, lua-code), they are unable to save files to that workspace.

Steps to Reproduce

1. Create a local folder with hyphens in the name (e.g., my-test-project)
2. Open the LuaInTheWeb IDE
3. Add the hyphenated folder as a local workspace
4. Create a new file or edit an existing file
5. Attempt to save the file

Expected Behavior

File saves successfully to the local folder.

Actual Behavior

[ ] To be filled in: Describe what happens - error message? Silent failure? Wrong location?

Environment

• Browser: [ Chrome / Edge / Other ]
• OS: [ Windows / macOS / Linux ]

Questions to Clarify

1. What error (if any) is displayed when trying to save? Is there a console error, toast notification, or does save appear to succeed but data isn't persisted?
2. What specific folder names reproduce the issue? For example, does test-folder fail but testfolder work?
3. Does this affect virtual workspaces with hyphenated names, or only local (File System Access API) workspaces?

Investigation Notes

Code review found that hyphenated paths appear to be handled correctly in:

• nameToMountPath() function (workspaceManagerHelpers.ts:50-56)
• resolveMount() method (CompositeFileSystem.ts:124-144)
• Path utilities (normalizePath, joinPath, etc.)
• Existing tests use hyphenated paths (/my-files) and pass

The issue may be:

• A specific edge case not covered by current tests
• Related to file system permissions rather than path handling
• A browser-specific File System Access API behavior
• A different bug being misattributed to hyphens

Acceptance Criteria

• Users can add local folders with hyphens in their names
• Files can be saved successfully to hyphen-named workspaces
• Existing tests pass
• New test added for hyphenated workspace names