feat: enhance platform dashboard UX and add security controls

- Move Add Company button to Companies card header for better context
- Add smart Save Changes button that only appears when data is modified
- Implement navigation protection with unsaved changes warnings
- Add company status checks to prevent suspended companies from processing data
- Fix platform dashboard showing incorrect user counts
- Add dark mode toggle to platform interface
- Add copy-to-clipboard for generated credentials
- Fix cookie conflicts between regular and platform auth
- Add invitedBy and invitedAt tracking fields to User model
- Improve overall platform management workflow and security

app/platform/layout.tsx

@@ -2,6 +2,7 @@
 
 import { SessionProvider } from "next-auth/react";
 import { Toaster } from "@/components/ui/toaster";
+import { ThemeProvider } from "@/components/theme-provider";
 
 export default function PlatformLayout({
   children,
@@ -9,9 +10,16 @@ export default function PlatformLayout({
   children: React.ReactNode;
 }) {
   return (
-    <SessionProvider basePath="/api/platform/auth">
-      {children}
-      <Toaster />
-    </SessionProvider>
+    <ThemeProvider
+      attribute="class"
+      defaultTheme="system"
+      enableSystem
+      disableTransitionOnChange
+    >
+      <SessionProvider basePath="/api/platform/auth">
+        {children}
+        <Toaster />
+      </SessionProvider>
+    </ThemeProvider>
   );
 }