Navigation tracking fixes:
- Filter out chrome-extension:// URLs to avoid triggering on extension internal pages
- Fixes "Could not establish connection" errors when sidepanel URL updates
- Remove unused currentTabUrl/currentTabIndex tracking variables
ChatPanel layout fixes:
- Fix windowWidth initialization (was 0 due to too-early evaluation)
- Set windowWidth in connectedCallback after DOM connection
- Add requestAnimationFrame to ensure width is measured after layout
- Add debug logging for troubleshooting layout issues
- Now properly respects BREAKPOINT (800px) for mobile vs desktop layout
7e79c05407