Add comprehensive easter egg system with mobile optimization

Implement 6 interactive easter eggs:
- "He Comes" mode (type "he comes" or "zalgo")
- 404 Text Not Found (type "404")
- Matrix red/blue pill modes
- Developer credits (type "credits" or click title 10x)
- Witching Hour (3:33 AM automatic activation)
- Mobile shake detection with haptic feedback

Fix easter egg trigger logic to prevent normal generation override.
Add complete documentation of all easter eggs in README.

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

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

app/styles.css

@@ -461,6 +461,20 @@ footer p {
     }
 }
 
+/* Shake animation for witching hour */
+@keyframes subtle-shake {
+    0%,
+    100% {
+        transform: translateX(0);
+    }
+    25% {
+        transform: translateX(-1px);
+    }
+    75% {
+        transform: translateX(1px);
+    }
+}
+
 /* Print styles */
 @media print {
     body {