Tablet UI edge-to-edge tweaks (#8159)

* LibraryScreen: Tweak content padding application to draw under nav bar

* BrowseScreen: Tweak content padding application to draw under nav bar

Side note the tab content doesn't actually use its
scaffold (bottom) contentPadding so it's definitely will
be a headache in the future.

* Don't hardcode bottom nav padding

app/src/main/java/eu/kanade/presentation/browse/SourcesScreen.kt

@@ -32,7 +32,6 @@ import eu.kanade.presentation.components.EmptyScreen
 import eu.kanade.presentation.components.LoadingScreen
 import eu.kanade.presentation.components.ScrollbarLazyColumn
 import eu.kanade.presentation.theme.header
-import eu.kanade.presentation.util.bottomNavPaddingValues
 import eu.kanade.presentation.util.horizontalPadding
 import eu.kanade.presentation.util.plus
 import eu.kanade.presentation.util.topPaddingValues
@@ -41,6 +40,7 @@ import eu.kanade.tachiyomi.source.LocalSource
 import eu.kanade.tachiyomi.ui.browse.source.SourcesPresenter
 import eu.kanade.tachiyomi.util.system.LocaleHelper
 import eu.kanade.tachiyomi.util.system.toast
+import eu.kanade.tachiyomi.widget.TachiyomiBottomNavigationView.Companion.bottomNavPadding
 import kotlinx.coroutines.flow.collectLatest
 
 @Composable
@@ -82,7 +82,7 @@ private fun SourceList(
     onClickPin: (Source) -> Unit,
 ) {
     ScrollbarLazyColumn(
-        contentPadding = bottomNavPaddingValues + WindowInsets.navigationBars.asPaddingValues() + topPaddingValues,
+        contentPadding = bottomNavPadding + WindowInsets.navigationBars.asPaddingValues() + topPaddingValues,
     ) {
         items(
             items = state.items,