The chat view was starting at the top showing oldest messages instead of
scrolling to the bottom to show the latest messages (like WhatsApp).
Root causes:
1. scheduleChatScroll() was called without force flag in refreshActiveTab()
2. The scroll was targeting .chat-thread element which has overflow:visible
and doesn't actually scroll - the window scrolls instead
Fixes:
- Pass force flag (!chatHasAutoScrolled) when loading chat tab
- Wait for Lit updateComplete before scrolling to ensure DOM is ready
- Scroll the window instead of the .chat-thread container
- Use behavior: 'instant' for immediate scroll without animation
511632f47c