Closely relates to #11 - [ ] create the front-end based on the following mock-ups: Identifier already set: <img width="1135" height="69" alt="Image" src="https://github.com/user-attachments/assets/cf31c4dd-1475-4fda-a598-c7d40c640652" /> Identifier not set: <img width="1216" height="72" alt="Image" src="https://github.com/user-attachments/assets/92a4a798-6ee6-460e-bce5-db8a77d4cf17" /> The UI is closely connected with #9. - - - - [ ] connect this Front-end with the PHP script from #11 - [ ] create Link to corresponding GitHub issue, if ID is already set