feat: Refactor layout and add toast notifications

This commit introduces a major structural refactoring by creating a shared application layout and integrates a toast notification system.

Key changes:
- A new `layout.tsx` file now contains the common Header and Footer components, ensuring a consistent structure across all pages.
- The main `page.tsx` has been simplified to only contain its specific content, with layout elements removed.
- The `react-toastify` library has been added to provide user feedback through toast notifications.
- Custom CSS styles have been applied to the toast notifications for a branded look and feel, including different gradient backgrounds for success, error, warning, and info states.
- The `.gitignore` file was updated to explicitly track the `.env` file, likely for an example configuration.

app/globals.css

@@ -14,3 +14,41 @@
 .gradient-text {
   @apply text-transparent bg-clip-text bg-[radial-gradient(circle,rgba(1,100,255,1)_0%,rgba(111,255,255,1)_100%)] w-fit text-6xl font-extrabold;
 }
+
+.Toastify__toast {
+  padding: 10px !important;
+  border-radius: 24px !important;
+  font-family: inherit !important;
+  display: flex !important;
+  align-items: center !important;
+
+  box-shadow: 0px 12px 34px 0px rgba(13, 10, 44, 0.05) !important;
+}
+
+.dark .Toastify__toast {
+  box-shadow: 0 20px 25px -5px rgb(255 255 255 / 0.07),
+    0 8px 10px -6px rgb(255 255 255 / 0.05) !important;
+}
+
+.Toastify__close-button {
+  display: none;
+}
+.Toastify__close-button {
+  display: none;
+}
+
+.Toastify__toast--success {
+  background: linear-gradient(to bottom right, #82e6ac, #1a8245) !important;
+}
+
+.Toastify__toast--error {
+  background: linear-gradient(to bottom right, #f89090, #e10e0e) !important;
+}
+
+.Toastify__toast--warning {
+  background: linear-gradient(to bottom right, #f59e0b, #d97706) !important;
+}
+
+.Toastify__toast--info {
+  background: linear-gradient(to bottom right, #8099ec, #1c3fb7) !important;
+}