feat: implement premium SaaS UI across all pages

Description

This issue covers the implementation of the new premium SaaS UI system across all major pages of the VISWAM.AI website.

The UI follows:

Dark theme with gradient glow (purple → blue → cyan) Glassmorphism cards Clean typography & spacing Modern SaaS layout (Stripe/Linear inspired) Screenshots 🎯 Goal Implement consistent UI across:

Home (Hero) Projects Programs Navigation (dropdowns) Shared components (cards, buttons, layout) 🧩 Pages to Implement

1. Home Page Hero section (gradient heading, tagline) Navbar (dropdowns) Dark theme layout
2. Projects Page Search bar Filter tabs (All, LLM, Speech, Vision, Community) Project cards (LLM + Community)
3. Programs Page Hero heading Program card (Summer of AI) CTA button
4. Shared Components Navbar (glass + dropdown) Cards (glassmorphism) Buttons (gradient + hover) Layout spacing