Update DbVisualizer documentation images (#3253)

## Summary
- Updated DbVisualizer reference images to reflect the new GUI
- Removed obsolete DbVisualizer images
- Fixed typo in connection image alt text

## Changes
- Added new DbVisualizer GUI screenshots
- Updated image references in documentation
- Removed outdated interface images

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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Co-authored-by: florent-leborgne <[email protected]>

Author: BloomBoy