Add Entity Diagnostics Dashboard with Smart Suggestions

- Add comprehensive entity health analysis with reliability scoring
- Add smart entity correlation suggestions based on state change timing
- Improve UX with friendly names in entity selectors
- Add integration source detection for better diagnostics
- Add historical data analysis (7-14 day windows)
- Add automated warnings for stale or unreliable entities

This feature helps users monitor tracked entity health and discover
new entities to track through intelligent correlation analysis.

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

Co-Authored-By: Claude <noreply@anthropic.com>

Author: 2 people