The API output for the /api/projects (list projects) and /api/projects/{id} (project details) should improve to:

• not use full paths (the project path) bc it can be a security concern
• use a tree output for the project filesystem instead of a flat list of filepaths
• make sure we ignore know files (ex: .staging)
• adopt an output type compatible (close match) to FileEntry.ts instead of the FileEntry from @tauri-apps/api/fs

After these changes we should be able to update the client code to remove convertTauriFileEntryToFileEntry

This is related to #414 and a follow-up of #425.