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>

CamperMonitorWatch/Views/WatchBubble.swift

@@ -31,9 +31,9 @@ struct WatchBubble: View {
                     .fill(color)
                     .frame(width: bubble, height: bubble)
                     // Positiver Pitch heisst: das Heck steht höher, die Blase
-                    // wandert nach oben – in der Ansicht also nach hinten.
+                    // wandert nach unten – in der Ansicht also nach hinten.
                     .offset(x: clamped(roll) / range * travel,
-                            y: -clamped(pitch) / range * travel)
+                            y: clamped(pitch) / range * travel)
                     .animation(.spring(duration: 0.3), value: pitch)
                     .animation(.spring(duration: 0.3), value: roll)
                     .opacity(pitch == nil && roll == nil ? 0.25 : 1)