v1.2.0: Add course info popovers, favicon, and viewport-fitted layout

- Course info popovers with description, instructors, and specialization
  tags; opens on hover (desktop) or tap (mobile) with smart positioning
- Page title and graduation cap favicon in NYU Stern purple
- Desktop layout fits viewport without page-level scrolling

app/vite.config.ts

@@ -6,7 +6,7 @@ import react from '@vitejs/plugin-react'
 export default defineConfig({
   plugins: [react()],
   define: {
-    __APP_VERSION__: JSON.stringify('1.1.1'),
+    __APP_VERSION__: JSON.stringify('1.2.0'),
     __APP_VERSION_DATE__: JSON.stringify('2026-03-27'),
   },
   server: {