Feature Request: Add Progress Indicator for Internal File Moves

### Problem
Currently, when moving files **within the same folder** in Copyparty:

- No progress indicator or status bar is displayed.
- Moving large files or many files at once is frustrating because you cannot see if the operation is still running or completed.

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### Proposed Solution
Add a **progress bar or status indicator** in the web interface for internal file moves:

- Show a progress bar or percentage during the move.
- Display the current file being moved (if multiple files).
- Provide accurate, real-time feedback on the operation’s progress.

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### Alternatives Considered
- Currently, the only alternative is to **wait without feedback** or manually check the server, which is not user-friendly.

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### Additional Context
- Improves usability for large directories or files.
- Makes file management in Copyparty more transparent and less frustrating.