extra donation button in the keepass unlock

Adding a extra donation button to support the app-maker, with more choice of amount

There is no subsciptionmodel (gladly) but time to time i think an extra donation will keep the maker fed and happy and he stays programming.

The issue names no files, tests, or entry points. First locate the Keepass unlock UI in the Android application and confirm how donation amounts should be presented. Done should include an additional donation button with the agreed amount choices, but the required choices and acceptance checks need clarification.

Written by the indexing model from the issue text.