Fix sun data refresh on app resume and periodic refresh

The periodic refresh was broken because collectLatest on a Room Flow
suspends indefinitely, preventing the while loop from advancing.
Replace with Flow.first() for one-shot snapshots. Add refresh() method
triggered via LifecycleEventEffect(ON_RESUME) so sun times recalculate
every time the app comes to foreground.

https://claude.ai/code/session_01QD2KVpt2xSRtRALne48g3n

app/src/main/java/com/sunzones/ui/main/MainScreen.kt

@@ -20,6 +20,8 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.compose.LifecycleEventEffect
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Brush
@@ -43,6 +45,10 @@ fun MainScreen(
     val uiState by viewModel.uiState.collectAsState()
     var showAddSheet by remember { mutableStateOf(false) }
 
+    LifecycleEventEffect(Lifecycle.Event.ON_RESUME) {
+        viewModel.refresh()
+    }
+
     Box(modifier = Modifier.fillMaxSize()) {
         if (uiState.locations.isEmpty() && !uiState.isLoading) {
             // Empty state

app/src/main/java/com/sunzones/ui/main/MainViewModel.kt

@@ -14,6 +14,7 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
@@ -75,12 +76,21 @@ class MainViewModel @Inject constructor(
         viewModelScope.launch {
             while (isActive) {
                 delay(60_000L) // refresh every minute for sun progress updates
-                getLocationsUseCase().collectLatest { locations ->
+                refreshNow()
+            }
+        }
+    }
+
+    fun refresh() {
+        viewModelScope.launch {
+            refreshNow()
+        }
+    }
+
+    private suspend fun refreshNow() {
+        val locations = getLocationsUseCase().first()
         _uiState.value = _uiState.value.copy(locations = locations)
     }
-            }
-        }
-    }
 
     fun deleteLocation(id: Long) {
         viewModelScope.launch {