feat: Implement visual experiment designer and enhance landing page

- Add drag-and-drop experiment design capabilities using @dnd-kit libraries
- Introduce new experiment-related database schema and API routes
- Enhance landing page with modern design, gradients, and improved call-to-action sections
- Update app sidebar to include experiments navigation
- Add new dependencies for experiment design and visualization (reactflow, react-zoom-pan-pinch)
- Modify study and experiment schemas to support more flexible experiment configuration
- Implement initial experiment creation and management infrastructure

drizzle.config.ts

@@ -8,5 +8,5 @@ export default {
   dbCredentials: {
     url: env.DATABASE_URL,
   },
-  tablesFilter: ["hristudio_*"],
+  tablesFilter: ["hs_*"],
 } satisfies Config;