Remove top app bar scroll behavior

This lets us make it more consistent with the Compose screens for now. Maybe it'll return in the future.

This also includes making the AboutController a full Compose controller with a new abstracted TopAppBar composable.

app/src/main/java/eu/kanade/presentation/webview/WebViewScreen.kt

@@ -11,10 +11,7 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material.icons.filled.ArrowForward
 import androidx.compose.material.icons.filled.Close
-import androidx.compose.material3.Icon
-import androidx.compose.material3.IconButton
 import androidx.compose.material3.LinearProgressIndicator
-import androidx.compose.material3.SmallTopAppBar
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
@@ -28,7 +25,7 @@ import com.google.accompanist.web.rememberWebViewNavigator
 import com.google.accompanist.web.rememberWebViewState
 import eu.kanade.presentation.components.AppBar
 import eu.kanade.presentation.components.AppBarActions
-import eu.kanade.presentation.components.AppBarTitle
+import eu.kanade.presentation.components.TopAppBar
 import eu.kanade.tachiyomi.BuildConfig
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.util.system.setDefaultSettings
@@ -48,21 +45,11 @@ fun WebViewScreen(
     val navigator = rememberWebViewNavigator()
 
     Column {
-        SmallTopAppBar(
-            title = {
-                AppBarTitle(
-                    title = state.pageTitle ?: initialTitle,
-                    subtitle = state.content.getCurrentUrl(),
-                )
-            },
-            navigationIcon = {
-                IconButton(onClick = onUp) {
-                    Icon(
-                        imageVector = Icons.Default.Close,
-                        contentDescription = stringResource(R.string.action_close),
-                    )
-                }
-            },
+        TopAppBar(
+            title = state.pageTitle ?: initialTitle,
+            subtitle = state.content.getCurrentUrl(),
+            navigateUp = onUp,
+            navigationIcon = Icons.Default.Close,
             actions = {
                 AppBarActions(
                     listOf(