android: make settings button focusable and clickable (#484)

Fixes tailscale/corp#22717

Signed-off-by: kari-ts <kari@tailscale.com>

android/src/main/java/com/tailscale/ipn/ui/view/MainView.kt

@@ -187,14 +187,20 @@ fun MainView(
                   }
                 },
                 trailingContent = {
-                  Box(modifier = Modifier.weight(1f), contentAlignment = Alignment.CenterEnd) {
+                  Box(
+                      modifier =
+                          Modifier.weight(1f)
+                              .focusable()
+                              .clickable { navigation.onNavigateToSettings() }
+                              .padding(8.dp), 
+                      contentAlignment = Alignment.CenterEnd) {
                         when (user) {
                           null -> SettingsButton { navigation.onNavigateToSettings() }
                           else ->
                               Box(
                                   contentAlignment = Alignment.Center,
                                   modifier =
-                                  Modifier.size(42.dp).clip(CircleShape).clickable {
+                                      Modifier.size(42.dp).clip(CircleShape).focusable().clickable {
                                         navigation.onNavigateToSettings()
                                       }) {
                                     Avatar(profile = user, size = 36) {