Slow bot eye and antenna animations

Max blinking: 6x rapid eye blinks, fast antenna flash, dual ring pulse

Enhance bot blinking: triple-blink eyes, rapid antenna flash, ring pulse effect

Redesign bot UI: Vibhu dark theme, blinking bot character, smaller compact widget

Update widget.js to match new UI + add /leads endpoint for captured contacts

Add multi-key Groq fallback + embeddable widget.js for vibhusolutions.com