TPadder v2.0 – Major Refactor & Feature additions

Improved UI

• Clear live preview for original, padded, and highlighted images.
• Highlight color selection integrated with preview.
• Save buttons enable only after image load.
• Status label shows real-time feedback.

Code quality

• Code separated into main.py, ui.py, and utils.py. Legacy TPadder.py removed.

Full Changelog: v1.0...v2.0