fix: ensure GoogleOAuthProvider is always available to prevent context errors

- Update providers to always render GoogleOAuthProvider with dummy ID when not configured
- This prevents "must be used within GoogleOAuthProvider" errors during SSR
- The login page still checks for valid client ID before showing Google button
- Fixes dev mode errors and ensures consistent behavior

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/providers.tsx

@@ -5,21 +5,15 @@ import { AuthProvider } from "@/contexts/AuthContext";
 import { ReactNode } from "react";
 
 export function Providers({ children }: { children: ReactNode }) {
-  const googleClientId = process.env.NEXT_PUBLIC_GOOGLE_CLIENT_ID || '';
+  // Use a dummy client ID if not provided to prevent context errors
+  // The actual authentication will still check for a valid ID
+  const googleClientId = process.env.NEXT_PUBLIC_GOOGLE_CLIENT_ID || 'dummy-client-id-not-configured';
 
-  const content = (
-    <AuthProvider>
-      {children}
-    </AuthProvider>
+  return (
+    <GoogleOAuthProvider clientId={googleClientId}>
+      <AuthProvider>
+        {children}
+      </AuthProvider>
+    </GoogleOAuthProvider>
   );
-
-  if (googleClientId) {
-    return (
-      <GoogleOAuthProvider clientId={googleClientId}>
-        {content}
-      </GoogleOAuthProvider>
-    );
-  }
-
-  return content;
 }