Fix toolbar issues: setSupportActionBar in Editor and Settings

- Add toolbar setup in NoteEditorActivity
- Add toolbar setup in SettingsActivity
- Add toolbar to activity_settings.xml layout
- Fix back button and menu display issues

android/app/src/main/java/dev/dettmer/simplenotes/SettingsActivity.kt

@@ -8,6 +8,7 @@ import android.widget.EditText
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.SwitchCompat
 import androidx.lifecycle.lifecycleScope
+import com.google.android.material.appbar.MaterialToolbar
 import dev.dettmer.simplenotes.sync.WebDavSyncService
 import dev.dettmer.simplenotes.utils.Constants
 import dev.dettmer.simplenotes.utils.showToast
@@ -32,6 +33,9 @@ class SettingsActivity : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_settings)
         
+        // Setup toolbar
+        val toolbar = findViewById<MaterialToolbar>(R.id.toolbar)
+        setSupportActionBar(toolbar)
         supportActionBar?.apply {
             setDisplayHomeAsUpEnabled(true)
             title = "Einstellungen"