refactor: centralize confirm and prompt dialog calls in frontend

job-tracker-ui/src/dialogs.ts

@@ -0,0 +1,7 @@
+export function confirmAction(message: string): boolean {
+  return window.confirm(message);
+}
+
+export function promptForValue(message: string, defaultValue = ""): string | null {
+  return window.prompt(message, defaultValue);
+}