Added delete feature and text viewer functionality

[dayal18]

This PR introduces two major features to improve file management and usability.

🚀 New Features

1. File Deletion

Backend: Added a new DELETE /api/delete endpoint in packages/lib that securely removes files using fs.unlink. It includes path validation to prevent directory traversal attacks.

Frontend: Added a generic onDelete prop to the FileRow component in web/src/routes/dir/$dirId.tsx.

UI: A "Delete" (Trash) icon now appears next to files in the browser list. Clicking it triggers a confirmation prompt before deletion.

2. Text File Viewer

Detection: Added mightBeText utility in web/src/util.ts to detect common text/code extensions (.txt, .md, .json, .js, etc.).

UI: Text files are now clickable in the file browser.

Viewer: The file viewer modal (web/src/routes/dir/$dirId/file.tsx) now supports fetching and displaying text content in a scrollable, dark-themed code block.

UX: Added user-select: text and proper zIndex handling to ensure text content is selectable and copyable, fixing issues with overlapping UI controls.

[dayal18]

#130

[mifi]

not sure about this... ezshare wasn't designed to be a fully fledged file manager really.

[dayal18]

It's alright, I understand. I personally use this as a file server for quick files transfer (not as a backup server). So I am using this version where I don't just have files lying around.

Also, when I copy from clipboard and use the function to save as text, it creates a random name which isn't clear if I have multiple things.

The only way to rename or delete any file that's not needed is through login into server (SSH), which is not feasible.

I can go ahead and close this if you prefer.