fix: refresh the Settings problem count on return

The hub read the self-check once, so after fixing something in the
self-check screen it kept showing the old number of problems. It now
re-reads on every resume, as the self-check screen does.

app/src/main/java/de/jeanlucmakiola/clockula/ui/settings/SettingsScreen.kt

@@ -29,6 +29,7 @@ import androidx.compose.material.icons.filled.Timer
 import androidx.compose.material.icons.filled.Translate
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -42,6 +43,9 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.res.vectorResource
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleEventObserver
+import androidx.lifecycle.compose.LocalLifecycleOwner
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.jeanlucmakiola.clockula.R
 import de.jeanlucmakiola.clockula.domain.Ringtones
@@ -87,6 +91,17 @@ fun SettingsScreen(
     val previewPlaying by viewModel.previewPlaying.collectAsStateWithLifecycle()
     val zonePicker by viewModel.zonePicker.collectAsStateWithLifecycle()
     var section by rememberSaveable { mutableStateOf<SettingsSection?>(null) }
+    val lifecycleOwner = LocalLifecycleOwner.current
+
+    // The hub's problem count, re-read on return from the self-check screen or
+    // from a system settings page it sent the user to.
+    DisposableEffect(lifecycleOwner) {
+        val observer = LifecycleEventObserver { _, event ->
+            if (event == Lifecycle.Event.ON_RESUME) viewModel.refreshSelfCheck()
+        }
+        lifecycleOwner.lifecycle.addObserver(observer)
+        onDispose { lifecycleOwner.lifecycle.removeObserver(observer) }
+    }
 
     // Registered unconditionally, for the same reason the alarm editor's is
     // (M5 D20): the picker's open flag is ViewModel state that does not

app/src/main/java/de/jeanlucmakiola/clockula/ui/settings/SettingsViewModel.kt

@@ -57,9 +57,9 @@ class SettingsViewModel @Inject internal constructor(
 ) : ViewModel() {
 
     /**
-     * Null until the one-off self-check read completes. Not live/ticking —
-     * the row only needs to be right when the hub is opened; the self-check
-     * screen itself re-reads on every visit.
+     * Null until the first self-check read completes. Not live/ticking:
+     * the hub re-reads it on every `ON_RESUME` ([refreshSelfCheck]), so a fix
+     * made in the self-check screen or in system settings shows on return.
      */
     private val selfCheckProblemCount = MutableStateFlow<Int?>(null)
 
@@ -80,13 +80,17 @@ class SettingsViewModel @Inject internal constructor(
     internal val launcherIcon: StateFlow<LauncherIcon> = _launcherIcon.asStateFlow()
 
     init {
+        refreshSelfCheck()
+        viewModelScope.launch {
+            _launcherIcon.value = withContext(io) { launcherIcons.current() }
+        }
+    }
+
+    fun refreshSelfCheck() {
         viewModelScope.launch {
             val results = SelfCheck.evaluate(deviceState.read())
             selfCheckProblemCount.value = results.count { it.status == CheckStatus.PROBLEM }
         }
-        viewModelScope.launch {
-            _launcherIcon.value = withContext(io) { launcherIcons.current() }
-        }
     }
 
     private val _ringtonePicker = MutableStateFlow<Pair<DefaultRingtoneKind, RingtonePickerUiState>?>(null)