- Add 5 mascot images (default, fire, point-up, point-self, camo) to public/mascot/
- New empty state component with floating mascot, tagline, and suggestion chips
- New utility toggle component (show/hide tool calls, thinking, system msgs, timestamps)
- Mascot logo in header with wobble animation on hover
- Floating animation and orange glow for mascot in empty state
- Suggestion chips dispatch events to fill chat textarea
- CSS visibility classes for all toggle states
