Safety:
- HTML escaping - Prevents XSS attacks
- Removed debug logs - No console spam
- Error handling - Silent failure in production
- Memory cleanup - Observer disconnects on page unload
Performance:
- Debouncing - Limits how often highlighting runs (250ms)
- Skip re-processing - Uses dataset.highlighted flag
- Smarter observer - Only reacts to significant DOM changes
- Early returns - Exits fast when no work needed
- Efficient parsing - Tries common position first, fallback second
Additional Benefits:
More precise magnitude detection (0.1-9.9 range)
Better decimal place validation
Handles edge cases gracefully
