[BUG] : Fix hardcoded file paths in dash.py to make dashboard portable across systems

[sohampirale]

Problem

The current dash.py file contains hardcoded Windows file paths that make the dashboard unusable for anyone other than the original developer:

data_dir = rf"C:\Users\SITAM MEUR\Desktop\web-eye-tracker-main\web-eye-tracker-main\app\services\calib_validation\csv\data"

This causes the following issues:

• Only works on the original developer's Windows machine
• Fails on Linux and macOS systems
• Fails for any other contributor trying to run the dashboard

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Related Files: app/services/dash.py