feat: Initialize GreenLens project with core dependencies and structure

Sets up the project using Vite, React, and TypeScript. Includes initial configuration for Tailwind CSS, Gemini API integration, and local storage management. Defines basic types for plant data and UI elements. The README is updated with local development instructions.

components/Toast.tsx

@@ -0,0 +1,37 @@
+
+import React, { useEffect, useState } from 'react';
+import { CheckCircle2 } from 'lucide-react';
+
+interface ToastProps {
+  message: string;
+  isVisible: boolean;
+  onClose: () => void;
+}
+
+export const Toast: React.FC<ToastProps> = ({ message, isVisible, onClose }) => {
+  const [show, setShow] = useState(false);
+
+  useEffect(() => {
+    if (isVisible) {
+      setShow(true);
+      const timer = setTimeout(() => {
+        setShow(false);
+        setTimeout(onClose, 300); // Wait for animation
+      }, 3000);
+      return () => clearTimeout(timer);
+    } else {
+        setShow(false);
+    }
+  }, [isVisible, onClose]);
+
+  if (!isVisible && !show) return null;
+
+  return (
+    <div className={`fixed bottom-20 left-0 right-0 z-[70] flex justify-center pointer-events-none transition-all duration-300 transform ${show ? 'translate-y-0 opacity-100' : 'translate-y-4 opacity-0'}`}>
+      <div className="bg-stone-900 dark:bg-white text-white dark:text-stone-900 px-4 py-3 rounded-full shadow-lg flex items-center space-x-2">
+        <CheckCircle2 size={18} className="text-green-500" />
+        <span className="text-sm font-medium">{message}</span>
+      </div>
+    </div>
+  );
+};