feat: update dependencies and enhance chat functionality

- Added new Radix UI components including checkbox, label, popover, slider, switch, and tooltip to improve UI interactions.
- Integrated react-syntax-highlighter for better code rendering in chat messages.
- Updated package.json and pnpm-lock.yaml to include new dependencies and ensure compatibility.
- Enhanced chat input to support web search toggling, improving user experience during message composition.
- Implemented auto-saving of chat sessions and improved session management features.
- Refactored chat message rendering to clean up metadata and improve display quality.

hooks/use-toast.ts

@@ -0,0 +1,27 @@
+'use client';
+
+import { useState, useCallback } from 'react';
+
+interface Toast {
+  title: string;
+  description?: string;
+  variant?: 'default' | 'destructive';
+}
+
+export function useToast() {
+  const showToast = useCallback(({ title, description, variant }: Toast) => {
+    // Simple implementation using console and alert for now
+    // Can be enhanced later with a proper toast component
+    if (variant === 'destructive') {
+      console.error(`[Toast] ${title}: ${description || ''}`);
+      alert(`Erro: ${title}\n${description || ''}`);
+    } else {
+      console.log(`[Toast] ${title}: ${description || ''}`);
+    }
+  }, []);
+
+  return {
+    toast: showToast,
+  };
+}
+