fix: Set opaque navigation bar background color

package app.k9mail.core.ui.compose.theme2

import android.app.Activity

import android.graphics.Color

import androidx.compose.runtime.Composable

import androidx.compose.runtime.SideEffect

import androidx.compose.ui.graphics.toArgb

        SideEffect {

            val window = (view.context as Activity).window

            window.statusBarColor = colorScheme.surfaceContainer.toArgb()

            window.navigationBarColor = Color.TRANSPARENT

            window.navigationBarColor = colorScheme.surfaceContainer.toArgb()

            WindowCompat.getInsetsController(window, view).isAppearanceLightStatusBars = !darkTheme

        }

    }