Fix Live Activity in CarPlay: show real bubble and text via .small family

CarPlay renders Live Activities through the .small activity family
(shared with the Watch Smart Stack), not the lock-screen content view.
Without it, CarPlay fell back to the Dynamic Island's compactLeading/
compactTrailing, which only had the generic "level" SF Symbol and an
empty trailing view — hence the wrong icon and missing text.

Adds .supplementalActivityFamilies([.small]) and a compact layout that
reuses the real LevelBubbleGlyph plus a one-line instruction for that
family, while the lock screen keeps its existing two-line view.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

VanAligneiOSWidget/VanAligneiOSWidgetLiveActivity.swift

@@ -81,7 +81,7 @@ private struct LevelBubbleGlyph: View {
 struct VanAligneiOSWidgetLiveActivity: Widget {
     var body: some WidgetConfiguration {
         ActivityConfiguration(for: LevelActivityAttributes.self) { context in
-            LockScreenLevelView(attributes: context.attributes, state: context.state)
+            LevelActivityContent(attributes: context.attributes, state: context.state)
                 .activityBackgroundTint(Color(white: 0.08))
                 .activitySystemActionForegroundColor(.white)
 
@@ -109,12 +109,60 @@ struct VanAligneiOSWidgetLiveActivity: Widget {
             }
             .keylineTint(context.state.isLevel ? .green : .orange)
         }
+        .supplementalActivityFamilies([.small])
     }
 }
 
-/// Sperrbildschirm- und Banner-Ansicht. Dieselbe Ansicht landet automatisch
-/// auch im CarPlay-Dashboard, sobald das iPhone verbunden ist – ein eigenes
-/// CarPlay-App-Target ist dafür nicht nötig.
+/// Wählt je nach Darstellungsgrösse zwischen Sperrbildschirm- und
+/// Kompaktansicht.
+///
+/// Ohne `.small`-Familie fällt CarPlay (wie die Smart Stack der Uhr) auf
+/// `compactLeading`/`compactTrailing` der Dynamic Island zurück – dort steht
+/// nur das generische Symbol und, weil `compactTrailing` leer bleibt, gar
+/// kein Text. Erst die `.small`-Familie liefert CarPlay Libelle und Text.
+private struct LevelActivityContent: View {
+    let attributes: LevelActivityAttributes
+    let state: LevelActivityAttributes.ContentState
+
+    @Environment(\.activityFamily) private var activityFamily
+
+    var body: some View {
+        switch activityFamily {
+        case .small:
+            CompactLevelView(attributes: attributes, state: state)
+        default:
+            LockScreenLevelView(attributes: attributes, state: state)
+        }
+    }
+}
+
+/// Kompaktform für CarPlay-Dashboard und Smart Stack der Uhr: Libelle plus
+/// eine Textzeile, ohne die längere Zwei-Zeilen-Aufschlüsselung des
+/// Sperrbildschirms.
+private struct CompactLevelView: View {
+    let attributes: LevelActivityAttributes
+    let state: LevelActivityAttributes.ContentState
+
+    var body: some View {
+        HStack(spacing: 12) {
+            LevelBubbleGlyph(pitch: state.pitch, roll: state.roll, isLevel: state.isLevel, diameter: 40)
+
+            Text(state.instruction
+                 ?? (state.pitch == nil && state.roll == nil ? "Keine Messwerte" : attributes.deviceName))
+                .font(.callout.weight(.semibold))
+                .foregroundStyle(state.isLevel ? .green : .white)
+                .lineLimit(1)
+                .minimumScaleFactor(0.8)
+
+            Spacer(minLength: 0)
+        }
+        .padding(.horizontal, 12)
+        .padding(.vertical, 8)
+        .foregroundStyle(.white)
+    }
+}
+
+/// Sperrbildschirm- und Banner-Ansicht.
 private struct LockScreenLevelView: View {
     let attributes: LevelActivityAttributes
     let state: LevelActivityAttributes.ContentState