Minimize Dynamic Island, show direction letters instead of signs, fix inverted pitch bubble

- Dynamic Island now shows only the level icon (compact/minimal); the
  bubble, instruction text, and numbers move to the shared lock
  screen/CarPlay ActivityView, which iOS renders identically on both
  surfaces (no separate CarPlay layout API exists for this).
- Replace +/- signs with a leading direction letter (H/F for Heck-
  Front, R/L for rechts-links) via a new shared LevelDirectionFormatting
  helper, used by the level screen, alignment assistant, and dashboard
  card. The generic "Messwerte" list keeps raw signed values.
- Live Activity's instruction now reads as two lines ("Heck steht
  höher 1.8°" / "links steht höher 0.9°") instead of a sentence plus a
  separate number column.
- Fix the bubble level graphic's pitch axis being inverted (front/rear
  reversed) in all three copies (app, watch, Live Activity widget) —
  confirmed against the known-correct VehicleTiltView orientation.
- Dashboard card shows pitch and roll side by side, large, without the
  "Längsneigung"/"Querneigung" labels, for the leveling device.

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

CamperMonitor/Views/LevelView.swift

@@ -76,8 +76,9 @@ struct LevelBubble: View {
                     .fill(bubbleColor)
                     .frame(width: bubble, height: bubble)
                     // Positiver Pitch heisst: das Heck steht höher, die Blase
-                    // wandert also nach oben – in der Ansicht nach hinten.
-                    .offset(x: offsetX, y: -offsetY)
+                    // wandert also nach unten – in der Ansicht nach hinten.
+                    // Muss zur "Fahrzeug"-Ansicht (VehicleTiltView) passen.
+                    .offset(x: offsetX, y: offsetY)
                     .animation(.spring(duration: 0.35), value: offsetX)
                     .animation(.spring(duration: 0.35), value: offsetY)
                     .opacity(pitch == nil && roll == nil ? 0.25 : 1)
@@ -138,8 +139,8 @@ struct LevelControls: View {
                 }
 
                 HStack(spacing: 24) {
-                    reading("Längs", state.pitch)
-                    reading("Quer", state.roll)
+                    reading("Längs", LevelDirectionFormatting.pitchTile(state.pitch))
+                    reading("Quer", LevelDirectionFormatting.rollTile(state.roll))
                 }
             }
             .frame(maxWidth: .infinity)
@@ -239,9 +240,9 @@ struct LevelControls: View {
         state.isKnownUncalibrated ? "Nullpunkt fehlt" : device.sensorOrientation.summary
     }
 
-    private func reading(_ title: String, _ value: Double?) -> some View {
+    private func reading(_ title: String, _ text: String) -> some View {
         VStack(spacing: 2) {
-            Text(value.map { String(format: "%.1f°", $0) } ?? "–")
+            Text(text)
                 .font(.title2.weight(.semibold).monospacedDigit())
             Text(title)
                 .font(.caption)