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/MigrateSourceScreen.kt

@@ -35,13 +35,13 @@ 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
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.ui.browse.migration.sources.MigrationSourcesPresenter
 import eu.kanade.tachiyomi.util.system.copyToClipboard
+import eu.kanade.tachiyomi.widget.TachiyomiBottomNavigationView.Companion.bottomNavPadding
 
 @Composable
 fun MigrateSourceScreen(
@@ -79,7 +79,7 @@ private fun MigrateSourceList(
     onToggleSortingDirection: () -> Unit,
 ) {
     ScrollbarLazyColumn(
-        contentPadding = bottomNavPaddingValues + WindowInsets.navigationBars.asPaddingValues() + topPaddingValues,
+        contentPadding = bottomNavPadding + WindowInsets.navigationBars.asPaddingValues() + topPaddingValues,
     ) {
         stickyHeader(key = "header") {
             Row(