rename ui to clan-app and move clan-app one layer up

pkgs/clan-app/webview-ui/app/util.ts

@@ -0,0 +1,33 @@
+export function isValidHostname(value: string | null | undefined) {
+  if (typeof value !== "string") return false;
+
+  const validHostnameChars = /^[a-zA-Z0-9-.]{1,253}\.?$/g;
+
+  if (!validHostnameChars.test(value)) {
+    return false;
+  }
+
+  if (value.endsWith(".")) {
+    value = value.slice(0, value.length - 1);
+  }
+
+  if (value.length > 253) {
+    return false;
+  }
+
+  const labels = value.split(".");
+
+  const isValid = labels.every(function (label) {
+    const validLabelChars = /^([a-zA-Z0-9-]+)$/g;
+
+    const validLabel =
+      validLabelChars.test(label) &&
+      label.length < 64 &&
+      !label.startsWith("-") &&
+      !label.endsWith("-");
+
+    return validLabel;
+  });
+
+  return isValid;
+}