diff --git a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/AlignmentAssistantScreen.kt b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/AlignmentAssistantScreen.kt
index 0679faf..c2c2024 100644
--- a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/AlignmentAssistantScreen.kt
+++ b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/AlignmentAssistantScreen.kt
@@ -115,7 +115,22 @@ fun AlignmentAssistantScreen(
             )
         },
     ) { padding ->
-        @Suppress("UNUSED_EXPRESSION") revision   // liest den Zähler, damit neu gezeichnet wird
+        // Der Assistent ist bewusst kein Compose-Zustand - die Protokollschicht
+        // soll nichts von Compose wissen. Sein Stand wird deshalb bei jeder
+        // neuen Messung in ein eigenes Wertobjekt gezogen. Ihn direkt
+        // weiterzureichen genügt nicht: Compose überspringt einen Aufruf, dessen
+        // Argument dieselbe Instanz ist, und der Ratschlag blieb dann stehen.
+        val view = remember(revision) {
+            AssistantView(
+                advice = assistant.advice,
+                hasReachedTarget = assistant.hasReachedTarget,
+                trend = assistant.trend,
+                deviation = assistant.current?.deviation,
+                best = assistant.best,
+                improvementAtBest = assistant.improvementAtBest,
+                secondsSinceBest = assistant.secondsSinceBest,
+            )
+        }
         Column(
             modifier = Modifier
                 .fillMaxSize()
@@ -142,17 +157,17 @@ fun AlignmentAssistantScreen(
                 VehicleTiltView(state.pitch, state.roll)
             }
 
-            AdviceBanner(assistant)
+            AdviceBanner(view)
 
             Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceEvenly) {
                 Reading("Längs", state.pitch, Modifier.weight(1f))
                 Reading("Quer", state.roll, Modifier.weight(1f))
-                Reading("Gesamt", assistant.current?.deviation, Modifier.weight(1f))
+                Reading("Gesamt", view.deviation, Modifier.weight(1f))
             }
 
-            val gain = assistant.improvementAtBest
-            val seconds = assistant.secondsSinceBest
-            val best = assistant.best
+            val gain = view.improvementAtBest
+            val seconds = view.secondsSinceBest
+            val best = view.best
             if (gain != null && seconds != null && best != null) {
                 Card(modifier = Modifier.fillMaxWidth()) {
                     Column(
@@ -168,9 +183,9 @@ fun AlignmentAssistantScreen(
                             )
                         }
                         Text(
-                            "Vor %.0f Sekunden stand das Fahrzeug %.1f° flacher (%.1f° statt %.1f°)."
-                                .format(seconds, gain, best.deviation,
-                                    assistant.current?.deviation ?: 0.0),
+                            de("Vor %.0f Sekunden stand das Fahrzeug %.1f° flacher (%.1f° statt %.1f°).",
+                                seconds, gain, best.deviation,
+                                view.deviation ?: 0.0),
                             style = MaterialTheme.typography.bodyMedium,
                             color = MaterialTheme.colorScheme.onSurfaceVariant,
                         )
@@ -222,13 +237,24 @@ private fun DisconnectedBanner() {
     }
 }
 
+/** Der Stand des Assistenten als Wert – siehe die Begründung oben. */
+private data class AssistantView(
+    val advice: String,
+    val hasReachedTarget: Boolean,
+    val trend: AlignmentAssistant.Trend,
+    val deviation: Double?,
+    val best: AlignmentAssistant.Sample?,
+    val improvementAtBest: Double?,
+    val secondsSinceBest: Double?,
+)
+
 @Composable
-private fun AdviceBanner(assistant: AlignmentAssistant) {
-    val reached = assistant.hasReachedTarget
+private fun AdviceBanner(view: AssistantView) {
+    val reached = view.hasReachedTarget
     val icon: ImageVector = if (reached) {
         Icons.Filled.CheckCircle
     } else {
-        when (assistant.trend) {
+        when (view.trend) {
             AlignmentAssistant.Trend.IMPROVING -> Icons.Filled.TrendingDown
             AlignmentAssistant.Trend.WORSENING -> Icons.Filled.TrendingUp
             AlignmentAssistant.Trend.STEADY -> Icons.Filled.TrendingFlat
@@ -255,7 +281,7 @@ private fun AdviceBanner(assistant: AlignmentAssistant) {
                 modifier = Modifier.size(32.dp),
             )
             Text(
-                assistant.advice,
+                view.advice,
                 style = MaterialTheme.typography.titleMedium,
                 modifier = Modifier.padding(start = 12.dp),
             )
@@ -296,7 +322,7 @@ private fun WedgeCard(state: LevelState, trackWidth: Double?, wheelbase: Double?
                                 modifier = Modifier.weight(1f),
                             )
                             Text(
-                                "%.0f cm".format(wedge.heightInCentimetres),
+                                de("%.0f cm", wedge.heightInCentimetres),
                                 style = MaterialTheme.typography.titleMedium,
                             )
                         }
diff --git a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/DeviceDetailScreen.kt b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/DeviceDetailScreen.kt
index 966f526..35c244e 100644
--- a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/DeviceDetailScreen.kt
+++ b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/DeviceDetailScreen.kt
@@ -48,6 +48,10 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.foundation.text.KeyboardActions
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.ui.focus.onFocusChanged
+import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Path
 import androidx.compose.ui.graphics.drawscope.Stroke
@@ -58,6 +62,7 @@ import de.fritob.campermonitor.bluetooth.BluetoothManager
 import de.fritob.campermonitor.bluetooth.BmsDiagnostics
 import de.fritob.campermonitor.protocol.ConfiguredDevice
 import de.fritob.campermonitor.protocol.DeviceLinkState
+import de.fritob.campermonitor.protocol.DeviceRole
 import de.fritob.campermonitor.protocol.DeviceTransport
 import de.fritob.campermonitor.protocol.FridgeZoneMode
 import de.fritob.campermonitor.protocol.LevelState
@@ -138,13 +143,13 @@ fun DeviceDetailScreen(
 
             // MARK: Steuerung
             val fridge = bluetooth.fridgeStates[device.id]
-            if (current.role == de.fritob.campermonitor.protocol.DeviceRole.FRIDGE &&
+            if (current.role == DeviceRole.FRIDGE &&
                 fridge != null && fridge.hasStatus
             ) {
                 FridgeControls(current, fridge, bluetooth)
             }
 
-            if (current.role == de.fritob.campermonitor.protocol.DeviceRole.LEVELING) {
+            if (current.role == DeviceRole.LEVELING) {
                 LevelSection(
                     device = current,
                     state = bluetooth.levelStates[device.id] ?: LevelState(),
@@ -183,7 +188,7 @@ fun DeviceDetailScreen(
             if (snapshot != null && snapshot.cellVoltages.isNotEmpty()) {
                 SectionHeader("Zellspannungen")
                 snapshot.cellVoltages.forEachIndexed { index, voltage ->
-                    LabeledRow("Zelle ${index + 1}") { Text("%.3f V".format(voltage)) }
+                    LabeledRow("Zelle ${index + 1}") { Text(de("%.3f V", voltage)) }
                 }
             }
 
@@ -195,7 +200,7 @@ fun DeviceDetailScreen(
             if (snapshot != null && snapshot.temperatures.size > 1) {
                 SectionHeader("Temperaturen")
                 snapshot.temperatures.forEachIndexed { index, value ->
-                    LabeledRow("Fühler ${index + 1}") { Text("%.0f °C".format(value)) }
+                    LabeledRow("Fühler ${index + 1}") { Text(de("%.0f °C", value)) }
                 }
             }
 
@@ -214,7 +219,7 @@ fun DeviceDetailScreen(
             SectionHeader("Einstellungen")
             NameField(current, store)
             LabeledRow("Typ") { Text(current.role.title) }
-            if (current.role == de.fritob.campermonitor.protocol.DeviceRole.FRIDGE) {
+            if (current.role == DeviceRole.FRIDGE) {
                 ZoneModePicker(current, store, bluetooth)
             }
             if (current.role.transport == DeviceTransport.ADVERTISEMENT) {
@@ -347,17 +352,29 @@ private fun KeyPrompt(onOpenKey: () -> Unit) {
 @Composable
 private fun NameField(device: ConfiguredDevice, store: DeviceStore) {
     var name by remember(device.id) { mutableStateOf(device.name) }
+
+    fun save() {
+        // Ein leeres Feld beim Tippen darf den Namen nicht löschen.
+        val trimmed = name.trim()
+        if (trimmed.isNotEmpty() && trimmed != device.name) {
+            store.update(device.copy(name = trimmed))
+        }
+    }
+
     OutlinedTextField(
         value = name,
-        onValueChange = {
-            name = it
-            // Ein leeres Feld beim Tippen darf den Namen nicht löschen.
-            val trimmed = it.trim()
-            if (trimmed.isNotEmpty()) store.update(device.copy(name = trimmed))
-        },
+        onValueChange = { name = it },
         label = { Text("Name") },
         singleLine = true,
-        modifier = Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 4.dp),
+        keyboardOptions = KeyboardOptions(imeAction = ImeAction.Done),
+        keyboardActions = KeyboardActions(onDone = { save() }),
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(horizontal = 16.dp, vertical = 4.dp)
+            // Beim Abschluss der Eingabe und beim Verlassen des Feldes
+            // gesichert - bei jedem Tastendruck zu speichern hiesse, die ganze
+            // Geräteliste je Zeichen neu zu schreiben.
+            .onFocusChanged { if (!it.isFocused) save() },
     )
 }
 
@@ -443,13 +460,13 @@ private fun HistoryChart(values: List<Double>, unit: String) {
         }
         Row(modifier = Modifier.fillMaxWidth().padding(horizontal = 16.dp)) {
             Text(
-                "%.2f %s".format(lowest, unit),
+                de("%.2f %s", lowest, unit),
                 style = MaterialTheme.typography.labelSmall,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
                 modifier = Modifier.weight(1f),
             )
             Text(
-                "%.2f %s".format(highest, unit),
+                de("%.2f %s", highest, unit),
                 style = MaterialTheme.typography.labelSmall,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )
diff --git a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/Format.kt b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/Format.kt
new file mode 100644
index 0000000..2c1cd92
--- /dev/null
+++ b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/Format.kt
@@ -0,0 +1,14 @@
+package de.fritob.campermonitor.ui
+
+import java.util.Locale
+
+/**
+ * Zahlen mit deutschem Trennzeichen.
+ *
+ * `String.format` ohne Sprachangabe nimmt die des Systems – dann steht in
+ * einer sonst deutschen Oberfläche plötzlich "1.58" statt "1,58", je nach
+ * Telefon verschieden. Die Messwerte selbst formatiert die Protokollschicht
+ * bereits so; hier gilt dasselbe für alles, was die Ansichten selbst rechnen.
+ */
+fun de(format: String, vararg args: Any?): String =
+    String.format(Locale.GERMANY, format, *args)
diff --git a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/LevelSetupScreen.kt b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/LevelSetupScreen.kt
index 9513084..5a845ea 100644
--- a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/LevelSetupScreen.kt
+++ b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/LevelSetupScreen.kt
@@ -167,8 +167,8 @@ private fun calibrationHint(state: LevelState): String {
     val pitchOffset = state.pitchOffset
     val rollOffset = state.rollOffset
     if (state.isCalibrated && pitchOffset != null && rollOffset != null) {
-        return "Der Nullpunkt liegt bei %.1f° längs und %.1f° quer. Zum Neusetzen das "
-            .format(pitchOffset, rollOffset) + "Fahrzeug eben stellen und dann tippen."
+        return de("Der Nullpunkt liegt bei %.1f° längs und %.1f° quer. ", pitchOffset, rollOffset) +
+            "Zum Neusetzen das Fahrzeug eben stellen und dann tippen."
     }
     if (state.isKnownUncalibrated) {
         return "Noch kein Nullpunkt gesetzt – die Anzeige zeigt die Lage des Sensors, " +
diff --git a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/LevelViews.kt b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/LevelViews.kt
index ecd8795..6fa050e 100644
--- a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/LevelViews.kt
+++ b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/LevelViews.kt
@@ -6,7 +6,6 @@ import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.aspectRatio
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
@@ -56,7 +55,15 @@ fun LevelBubble(pitch: Double?, roll: Double?, range: Double = 6.0) {
     val outline = MaterialTheme.colorScheme.outlineVariant
     val fill = MaterialTheme.colorScheme.surfaceVariant
 
-    Canvas(modifier = Modifier.fillMaxWidth().aspectRatio(1f)) {
+    Canvas(
+        // Feste Höhe statt `aspectRatio`: das würde die Höhe wieder an die
+        // Breite koppeln und die Deckelung aushebeln - die Libelle wuchs dann
+        // über ihren Platz hinaus und schob sich über die Umschalter.
+        // Der Kreis wird darin ohnehin mittig und passend gezeichnet.
+        modifier = Modifier
+            .fillMaxWidth()
+            .height(260.dp)
+    ) {
         val side = minOf(size.width, size.height)
         val radius = side / 2
         val bubble = side * 0.16f
@@ -156,7 +163,7 @@ private fun TiltedVehicle(
         Row(modifier = Modifier.fillMaxWidth()) {
             Text(title, style = MaterialTheme.typography.titleSmall, modifier = Modifier.weight(1f))
             Text(
-                value?.let { "%.1f°".format(it) } ?: "–",
+                value?.let { de("%.1f°", it) } ?: "–",
                 style = MaterialTheme.typography.titleSmall,
                 fontWeight = FontWeight.SemiBold,
                 color = tint,
@@ -197,7 +204,7 @@ fun Reading(title: String, value: Double?, modifier: Modifier = Modifier) {
         horizontalAlignment = Alignment.CenterHorizontally,
     ) {
         Text(
-            value?.let { "%.1f°".format(it) } ?: "–",
+            value?.let { de("%.1f°", it) } ?: "–",
             style = MaterialTheme.typography.titleLarge,
             fontWeight = FontWeight.SemiBold,
         )
diff --git a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/ProfilesScreen.kt b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/ProfilesScreen.kt
index 24ecc88..afa638a 100644
--- a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/ProfilesScreen.kt
+++ b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/ProfilesScreen.kt
@@ -158,8 +158,8 @@ private fun measuresText(profile: Profile): String {
     val base = profile.wheelbase
     if (track == null && base == null) return ""
     val parts = buildList {
-        track?.let { add("Spur %.2f m".format(it)) }
-        base?.let { add("Radstand %.2f m".format(it)) }
+        track?.let { add(de("Spur %.2f m", it)) }
+        base?.let { add(de("Radstand %.2f m", it)) }
     }
     return " · " + parts.joinToString(", ")
 }
diff --git a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/Theme.kt b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/Theme.kt
index 81a18a1..10d339e 100644
--- a/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/Theme.kt
+++ b/Android/app/src/main/kotlin/de/fritob/campermonitor/ui/Theme.kt
@@ -1,20 +1,20 @@
 package de.fritob.campermonitor.ui
 
-import android.os.Build
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.darkColorScheme
-import androidx.compose.material3.dynamicDarkColorScheme
-import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.material3.lightColorScheme
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.platform.LocalContext
 
 /**
  * Das Grün der iOS-Fassung als Akzent – damit beide Apps als dieselbe erkennbar
- * bleiben. Ab Android 12 gewinnt die Farbwelt des Systems, das ist dort die
- * Erwartung.
+ * bleiben.
+ *
+ * Bewusst **ohne** die dynamischen Systemfarben ab Android 12. In dieser App
+ * trägt Farbe Bedeutung: grün heisst eben, orange knapp daneben, rot schief.
+ * Eine vom Hintergrundbild abgeleitete Akzentfarbe stünde daneben und liesse
+ * die App je nach Telefon anders aussehen als ihr eigenes Logo.
  */
 private val CamperGreen = Color(0xFF1F9E52)
 
@@ -33,12 +33,8 @@ fun CamperTheme(
     darkTheme: Boolean = isSystemInDarkTheme(),
     content: @Composable () -> Unit,
 ) {
-    val context = LocalContext.current
-    val colors = when {
-        Build.VERSION.SDK_INT >= Build.VERSION_CODES.S ->
-            if (darkTheme) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
-        darkTheme -> DarkColors
-        else -> LightColors
-    }
-    MaterialTheme(colorScheme = colors, content = content)
+    MaterialTheme(
+        colorScheme = if (darkTheme) DarkColors else LightColors,
+        content = content,
+    )
 }
diff --git a/Android/env.sh b/Android/env.sh
index 836f4cd..514168e 100644
--- a/Android/env.sh
+++ b/Android/env.sh
@@ -3,4 +3,4 @@
 export JAVA_HOME=/opt/homebrew/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home
 export ANDROID_HOME="$HOME/Library/Android/sdk"
 export ANDROID_SDK_ROOT="$ANDROID_HOME"
-export PATH="$JAVA_HOME/bin:/opt/homebrew/share/android-commandlinetools/cmdline-tools/latest/bin:$ANDROID_HOME/platform-tools:$PATH"
+export PATH="$JAVA_HOME/bin:$ANDROID_HOME/cmdline-tools/latest/bin:$ANDROID_HOME/platform-tools:$ANDROID_HOME/emulator:$PATH"