Migration to nuxt 4

Used codemods CLI and reworked most alias'd path that stopped working

app/utils/Regex.ts

@@ -0,0 +1,29 @@
+/**
+ * Check if the string parses as single digit
+ *
+ * @param str String to test
+ * @returns Result of the test
+ */
+export function isDigit(str: string) {
+  return RegExp(/^\d$/g).test(str)
+}
+
+/**
+ * Check if the string parses as an int
+ *
+ * @param str String to test
+ * @returns Result of the test
+ */
+export function isInt(str: string) {
+  return RegExp(/^[0-9]*$/g).test(str)
+}
+
+/**
+ * Check if the string parses as a signed int (negative or positive)
+ *
+ * @param str String to test
+ * @returns Result of the test
+ */
+export function isSignedInt(str: string) {
+  return RegExp(/^[-+]?[0-9]+$/g).test(str)
+}