🐛 (index.html): fix selector for install-command-button to ensure cor…

…rect element is targeted

✨ (index.html): add error handling and alert for missing install-command-button element

docs/index.html

@@ -555,9 +555,11 @@ <h2 class="text-4xl mb-6 text-green-500 font-bold terminal-text">
         navigator.clipboard
           .writeText(text)
           .then(() => {
-            const button = document.querySelector(
-              "#install-command-button + button"
-            );
+            const button = document.querySelector("#install-command-button");
+            if (!button) {
+                console.error("install-command-button not found");
+                alert("Code copied to clipboard.");
+            };
             const originalContent = button.innerHTML;
             button.innerHTML =
               '<svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5" viewBox="0 0 20 20" fill="currentColor"><path d="M9 2a1 1 0 000 2h2a1 1 0 100-2H9z" /><path fill-rule="evenodd" d="M4 5a2 2 0 012-2 3 3 0 003 3h2a3 3 0 003-3 2 2 0 012 2v11a2 2 0 01-2 2H6a2 2 0 01-2-2V5zm9.707 5.707a1 1 0 00-1.414-1.414L9 12.586l-1.293-1.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z" clip-rule="evenodd" /></svg>';