Fix: Larger touch area in object rotate mode

[tordans]

Problem (User Story)

As an OpenStreetMap editor using Go Map
I want to rotate a selected object in rotate mode using the entire map area
So that I do not have to aim at a small cyan overlay and rotation works reliably.

Current behavior: In rotate mode, the effective touch target for rotation is very small (visually only a narrow arc around the object). Finger movement on the display often does not rotate the object — instead the map pans or other gestures take over.

Expected behavior: In rotate mode, the full map view (at least the entire MapView) should trigger rotation — via one-finger drag or two-finger rotation.

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Implementation Notes (by Cursor)

• Disable competing gestures: While isRotateObjectMode is active, map pan, screen rotation, and scroll-wheel zoom are disabled in MainViewController (setObjectRotationModeActive). Pinch was already blocked; tap-and-drag is blocked as well.
• One-finger rotation across the map: New UIPanGestureRecognizer (maximumNumberOfTouches = 1) on MapView computes the angle between the touch point and the object center and calls EditorMapLayer.rotateContinue with a normalized angle delta.
• Two-finger rotation: rotationGesture.rotation is reset to 0 after each frame (incremental deltas, same pattern as map rotation) so rotation does not jump.
• Review follow-ups:
  • One-finger pan no longer exits rotate mode on .cancelled/.failed (e.g. when a second finger is added for two-finger rotation).
  • Object rotation gestures are rejected on UIControl/UIToolbar touches (same pattern as tap).
  • Scroll-wheel zoom is disabled/guarded during rotate mode (Mac Catalyst parity with pinch/pan).
• Files changed: src/Shared/MapView.swift, src/iOS/MainViewController.swift

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Testing Notes (by @tordans)

• Select a way or multipolygon → Edit → enable Rotate
• One finger: Drag in a circular motion anywhere on the map (not only on the cyan arc) → object rotates around its center
• Two fingers: Rotate on different map areas (center, edges, top/bottom)
• One finger then two: Start with one finger, add a second → rotate mode stays active and two-finger rotation works
• While in rotate mode: map should not pan with one finger (pan disabled)
• While in rotate mode on Mac: scroll-wheel zoom should not work
• Dragging on the edit toolbar should not rotate the object
• After ending the gesture: rotate mode exits as before (push pin reappears)
• A short tap on the map still exits rotate mode
• Optional: Mac Catalyst / trackpad with two fingers
• Regression: normal pan/zoom/map rotation outside rotate mode unchanged