refactor: consolidate game components and add toast notifications

- Remove EndlosGame support and GameDetail141.jsx component
- Add Toast notification system with CSS styling
- Refactor GameCompletionModal with enhanced styling
- Improve GameDetail component structure and styling
- Add BaseLayout.astro for consistent page structure
- Update gameService with cleaner logic
- Enhance global styles and remove unused constants
- Streamline navigation components

src/styles/index.css

@@ -149,6 +149,20 @@ input:focus, select:focus {
     color: white;
 }
 
+.btn--secondary {
+    background: #333;
+    color: #fff;
+    border: 2px solid #555;
+}
+
+.btn--secondary:hover {
+    background: #444;
+    border-color: #666;
+    transform: translateY(-1px);
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
+}
+}
+
 .btn-primary:hover {
     background: var(--color-primary-hover);
 }