- Add pollMensajes() so wire:poll no longer force-scrolls to bottom
- MutationObserver detects new DOM nodes: auto-scrolls only if user
is already at the bottom (within 80px threshold)
- Floating '↓ N mensaje nuevo' badge appears when new bot messages
arrive while user is scrolled up; tap badge to jump to bottom
- scroll-chat event (emitted on button clicks/sends) still forces
scroll since the user just took an action
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
