feat: modern SaaS UI - redesign Hero section and Dropzone widget

- tailwind.config.js: add borderRadius (3xl/4xl), glow box-shadows, smooth transition
- global.css: hero-upload-zone uses rounded-3xl, scale on drag, enhanced hover lift
- HeroUploadZone: UploadCloud icon, group hover animations, rounded-full CTAs, improved layout
- HomePage: animated badge pill, larger heading, improved gradient

Agent-Logs-Url: https://github.com/aborayan2022/SaaS-PDF/sessions/a233a493-2fcf-4025-bd7f-68446c105e28

Co-authored-by: aborayan2022 <119736744+aborayan2022@users.noreply.github.com>

frontend/tailwind.config.js

@@ -38,6 +38,17 @@ export default {
         sans: ['Inter', 'Tajawal', 'system-ui', 'sans-serif'],
         arabic: ['Tajawal', 'Inter', 'sans-serif'],
       },
+      borderRadius: {
+        '3xl': '1.5rem',
+        '4xl': '2rem',
+      },
+      boxShadow: {
+        'glow': '0 0 20px -4px rgba(59, 130, 246, 0.4)',
+        'glow-lg': '0 0 40px -8px rgba(59, 130, 246, 0.5)',
+      },
+      transitionTimingFunction: {
+        'smooth': 'cubic-bezier(0.4, 0, 0.2, 1)',
+      },
     },
   },
   plugins: [],