First of Year Birds
Mark first of year birds in some way.
This is now available via badges in the entry page.
Simon Booton-Mander commented
You can already do this by entering a custom Observation property. I have added a dropdown with 2 options: YT (Year tick) & LT (Lifer), you can call them what you please and the option is there for each entry if required but if not chosen left blank.