Rework wall-climb controls: constant W/S climb, mouse-drag wall pose

- W/S climb straight up/down at a constant speed (camera pitch no longer
  tilts or slows them); the camera only drives A/D strafe along the wall.
- The body now always faces the wall. Holding LMB and dragging sets the
  wall pose: vertical drag leans out from / back to the wall (offset eases
  back to zero while moving, never detaches), horizontal drag turns the
  body (yaw held until leaving the wall, eased back by ground rotation).
- Pause the camera orbit while dragging the wall pose (LookSuppressed).
- Drop the camera-to-wall angle logic and the old approach/detach-distance
  model; add wallMaxOffset, wallOffsetSensitivity, wallOffsetReturnSpeed
  and wallRotateSensitivity.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scripts/ThirdPersonOrbitInput.cs

@@ -64,6 +64,13 @@ public class ThirdPersonOrbitInput : MonoBehaviour
         set { lookMode = value; ApplyCursorState(); }
     }
 
+    /// <summary>
+    /// While true, mouse-look is paused (orbit frozen) without changing the cursor
+    /// state. The player controller sets this while dragging the wall-climb offset so
+    /// the same mouse motion is not also spent orbiting the camera.
+    /// </summary>
+    public bool LookSuppressed { get; set; }
+
     void Awake()
     {
         _orbit = GetComponent<CinemachineOrbitalFollow>();
@@ -80,12 +87,12 @@ public class ThirdPersonOrbitInput : MonoBehaviour
         if (!_orbit)
             return;
 
-        bool rotating = ShouldRotate();
+        bool modeWantsLook = ShouldRotate();
 
         if (manageCursor)
-            SetCursorLocked(rotating);
+            SetCursorLocked(modeWantsLook);
 
-        if (rotating)
+        if (modeWantsLook && !LookSuppressed)
         {
             Vector2 delta = ReadMouseDelta();
             if (delta.sqrMagnitude > 0f)