Väg-skärm: behåll mätresultatet vid sparfel (visa fel separat)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01C2GA94E1f3cmrvdQLQhYdg

app/src/main/java/eu/brassepc/fitnessdroid/ui/scale/ScaleScreens.kt

@@ -316,6 +316,7 @@ class WeighViewModel(
 ) : ViewModel() {
     val state = MutableStateFlow<WeighState>(WeighState.Idle)
     val saved = MutableStateFlow(false)
+    val saveError = MutableStateFlow<String?>(null)
     val missingBodyData = MutableStateFlow(false)
 
     init {
@@ -353,6 +354,7 @@ class WeighViewModel(
     fun start() {
         state.value = WeighState.Working("Söker efter vågen…")
         saved.value = false
+        saveError.value = null
         viewModelScope.launch {
             missingBodyData.value = !scaleManager.hasBodyData()
             val ok = scaleManager.connectSavedScale()
@@ -368,6 +370,7 @@ class WeighViewModel(
         viewModelScope.launch {
             fun pct(v: Float): Double? = if (v > 0f) String.format(java.util.Locale.US, "%.1f", v).toDouble() else null
             try {
+                saveError.value = null
                 repo.addBodyMeasurement(
                     weightKg = String.format(java.util.Locale.US, "%.1f", m.weight).toDouble(),
                     dateIso = null,
@@ -377,7 +380,7 @@ class WeighViewModel(
                 )
                 saved.value = true
             } catch (e: Exception) {
-                state.value = WeighState.Failed("Kunde inte spara mätningen — offline?")
+                saveError.value = "Kunde inte spara mätningen — offline? Prova igen."
             }
         }
     }
@@ -404,6 +407,7 @@ fun WeighScreen(
 ) {
     val state by viewModel.state.collectAsStateWithLifecycle()
     val saved by viewModel.saved.collectAsStateWithLifecycle()
+    val saveError by viewModel.saveError.collectAsStateWithLifecycle()
     val missingBodyData by viewModel.missingBodyData.collectAsStateWithLifecycle()
 
     val context = LocalContext.current
@@ -519,6 +523,13 @@ fun WeighScreen(
                             ResultRow("Benmassa", m.bone, " kg")
                             ResultRow("Bukfett (index)", m.visceralFat, "")
 
+                            saveError?.let {
+                                Text(
+                                    it,
+                                    color = MaterialTheme.colorScheme.error,
+                                    style = MaterialTheme.typography.bodySmall,
+                                )
+                            }
                             if (saved) {
                                 Text(
                                     "Sparad som kroppsmätning ✓",