Add validation for unsupported Tower of Hanoi disk counts

Author: Bhairavi-28

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "liveServer.settings.port": 5501
+}

web-app/js/projects.js

@@ -3292,6 +3292,11 @@ function initTowerOfHanoi() {
 
     async function solve() {
         if (isAnimating) return;
+
+        if (diskCount < 3 || diskCount > 7) {
+            alert("Visualization supports only 3 to 7 disks");
+            return;
+        }
 
         isAnimating = true;
         solveBtn.disabled = true;