System and Application Theme

Is your feature request related to a problem? Please describe.
System theme and Enatega Application theme is contradicting with each other.

Describe the solution you'd like
When the user install the enatega application and uses it, the application should be able to pick whichever theme system is already using.

No files, tests, or entry points are named. Start by locating the Flutter application's theme configuration and system-theme handling, then reproduce the mismatch with different device themes. Done means the application follows the system theme consistently without contradicting its configured application theme.

Written by the indexing model from the issue text.