Refinements across the app for a smoother, more reliable experience.

Recent updates:
- All-new 2.0 design: clearer Stitch and Scrollshot workflows
- Upgraded stitching algorithm: more accurate overlap detection and faster performance
- New Cut tool: remove unwanted sections
- New Crop tool: trim blank edges and unwanted content
- New automatic scroll bar removal, with an on/off toggle in Settings
- Import system screen recordings to create long screenshots automatically
- New theme colors and app icons
- Improved saving, sharing, and exporting to PDF or ZIP