Magikeyboard UI

### Checks

- [x] I have read the Wiki, searched the open issues, and still think this is a new feature.

### Explain the problem clearly and succinctly:

_No response_

### Describe the solution you'd like:

_From playstore ->_ Asthetics enhancenment request: The app name shown in green bar on can be dispalyed in black and white just like rest of things on magikeyboard. It would be more aesthetic that way imo. Also a black n white theme scheme as per system could be added to it. Removing the display of "username" below entry name would be good too as it will increase privacy in case of sensitive logins and will save a bit of space. Multiple entries can be differentiated already by keeping entry names different. Thanks

### Describe alternatives you've considered:

_No response_

### Additional context:

_No response_

Start by locating the Magikeyboard UI in the Android app and reviewing where the green app-name bar, entry names, and usernames are rendered. Done means the app name follows the requested black-and-white styling, the system theme is supported, and usernames can be removed from entries without losing differentiation.

Written by the indexing model from the issue text.