swancustomenvironments: Detect uv issues when resolving packages

Detect uv error messages and include lowercase error messages

SwanCustomEnvironments/swancustomenvironments/templates/customenvs.html

@@ -229,7 +229,7 @@ <h2 id="modal-title" style="text-align: left;"></h2>
                     else {
                         outputBox.innerHTML += message_line;
                         outputBox.scrollTop = outputBox.scrollHeight;
-                        if (message_line.includes('ERROR')) {
+                        if (message_line.toUpperCase().includes('ERROR')) {
                             has_failed = true;
                         }
                     }