feat: Enhance plugin store and experiment design infrastructure

- Add plugin store system with dynamic loading of robot actions
- Implement plugin store API routes and database schema
- Update experiment designer to support plugin-based actions
- Refactor environment configuration and sidebar navigation
- Improve authentication session handling with additional user details
- Update Tailwind CSS configuration and global styles
- Remove deprecated files and consolidate project structure

src/components/providers/index.tsx

@@ -0,0 +1,24 @@
+"use client";
+
+import { ThemeProvider } from "next-themes";
+import { StudyProvider } from "./study-provider";
+import { PluginStoreProvider } from "./plugin-store-provider";
+import { Toaster } from "~/components/ui/toaster";
+
+export function Providers({ children }: { children: React.ReactNode }) {
+  return (
+    <ThemeProvider
+      attribute="class"
+      defaultTheme="system"
+      enableSystem
+      disableTransitionOnChange
+    >
+      <PluginStoreProvider>
+        <StudyProvider>
+          {children}
+          <Toaster />
+        </StudyProvider>
+      </PluginStoreProvider>
+    </ThemeProvider>
+  );
+}