fix(compose): adjust APSAppBar API and add previews

ui/compose/src/main/kotlin/app/passwordstore/ui/APSAppBar.kt

@@ -1,8 +1,11 @@
 package app.passwordstore.ui
 
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.TopAppBarDefaults
@@ -11,7 +14,11 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.shadow
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.painter.Painter
+import androidx.compose.ui.graphics.vector.rememberVectorPainter
 import androidx.compose.ui.unit.dp
+import app.passwordstore.ui.compose.preview.DevicePreviews
+import app.passwordstore.ui.compose.preview.ThemePreviews
+import app.passwordstore.ui.compose.theme.APSTheme
 
 @Composable
 @OptIn(ExperimentalMaterial3Api::class)
@@ -19,14 +26,14 @@ public fun APSAppBar(
   title: String,
   backgroundColor: Color,
   navigationIcon: Painter?,
-  onNavigationIconClick: (() -> Unit)?,
   modifier: Modifier = Modifier,
+  onNavigationIconClick: (() -> Unit) = {},
 ) {
   TopAppBar(
     title = { Text(text = title) },
     navigationIcon = {
       if (navigationIcon != null) {
-        IconButton(onClick = { onNavigationIconClick?.invoke() }) {
+        IconButton(onClick = { onNavigationIconClick.invoke() }) {
           Icon(
             painter = navigationIcon,
             contentDescription = null,
@@ -38,3 +45,16 @@ public fun APSAppBar(
     modifier = modifier.shadow(8.dp),
   )
 }
+
+@ThemePreviews
+@DevicePreviews
+@Composable
+private fun APSAppBarPreview() {
+  APSTheme {
+    APSAppBar(
+      title = "Preview",
+      backgroundColor = MaterialTheme.colorScheme.surface,
+      navigationIcon = rememberVectorPainter(Icons.AutoMirrored.Filled.ArrowBack),
+    )
+  }
+}