Low contrast color in login page

[ineol]

PR #236 replaces FlatButton by TextButton. This has the effect of having the text of the button becoming light pink (primary color), which is not readable.

One solution is to change textButtonTheme in the custom theme?

[guidezpl]

Thanks for flagging, the solution we went for was to add a foregroundColor to the button

                  style: ButtonStyle(
                    foregroundColor: MaterialStateProperty.all(
                      Theme.of(context).colorScheme.secondary,
                    ),
                    shape: MaterialStateProperty.all(
                      const BeveledRectangleBorder(
                        borderRadius: BorderRadius.all(Radius.circular(7.0)),
                      ),
                    ),
                  ),