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/AlignmentAssistantView.swift

@@ -138,15 +138,15 @@ struct AlignmentAssistantView: View {
 
     private var readings: some View {
         HStack(spacing: 12) {
-            reading("Längs", state.pitch)
-            reading("Quer", state.roll)
-            reading("Gesamt", assistant.current?.deviation)
+            reading("Längs", LevelDirectionFormatting.pitchTile(state.pitch))
+            reading("Quer", LevelDirectionFormatting.rollTile(state.roll))
+            reading("Gesamt", LevelDirectionFormatting.magnitude(assistant.current?.deviation))
         }
     }
 
-    private func reading(_ title: String, _ value: Double?) -> some View {
+    private func reading(_ title: String, _ text: String) -> some View {
         VStack(spacing: 4) {
-            Text(value.map { String(format: "%.1f°", $0) } ?? "–")
+            Text(text)
                 .font(.title2.weight(.semibold).monospacedDigit())
             Text(title)
                 .font(.caption)