Hygiene B4b: extract CameraResolver (dedup triplicated ResolveCamera)

The byte-identical ResolveCamera() (Camera.main -> PrototypeCameraRig fallback) in PlayerInputGatherSystem, BuildSendSystem, and AimReticleSystem now call one CameraResolver.Resolve(); camera-resolution policy lives in one place. Behaviour-identical; compiles clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/_Project/Scripts/Client/Building/BuildSendSystem.cs

@@ -143,7 +143,7 @@ namespace ProjectM.Client
             }
 
             if (!SystemAPI.TryGetSingleton<BaseAnchor>(out var anchor)) { HideGhost(); return; }
-            if (_camera == null) _camera = ResolveCamera();
+            if (_camera == null) _camera = CameraResolver.Resolve();
             if (_camera == null || mouse == null) { HideGhost(); return; }
 
             // Cursor -> ground -> cell.
@@ -248,16 +248,7 @@ namespace ProjectM.Client
             _ghost.SetActive(false);
         }
 
-        UnityEngine.Camera ResolveCamera()
-        {
-            var cam = UnityEngine.Camera.main;
-            if (cam == null)
-            {
-                var rig = Object.FindAnyObjectByType<PrototypeCameraRig>();
-                if (rig != null) cam = rig.GetComponent<UnityEngine.Camera>();
-            }
-            return cam;
-        }
+
 
         bool TryGetLocalPlayerCell(out int2 cell)
         {

Assets/_Project/Scripts/Client/Input/PlayerInputGatherSystem.cs

@@ -126,7 +126,7 @@ namespace ProjectM.Client
             AimPresentation.Scheme = _scheme;
 
             // Mouse cursor projection needs the camera; resolve/cache it (Camera.main or the rig's camera).
-            if (_camera == null) _camera = ResolveCamera();
+            if (_camera == null) _camera = CameraResolver.Resolve();
             UnityEngine.Vector2 cursorScreen = mouse != null ? mouse.position.ReadValue() : default;
 
             foreach (var (input, xform) in
@@ -173,15 +173,6 @@ namespace ProjectM.Client
             }
         }
 
-        private UnityEngine.Camera ResolveCamera()
-        {
-            var cam = UnityEngine.Camera.main;
-            if (cam == null)
-            {
-                var rig = UnityEngine.Object.FindAnyObjectByType<PrototypeCameraRig>();
-                if (rig != null) cam = rig.GetComponent<UnityEngine.Camera>();
-            }
-            return cam;
-        }
+
     }
 }

Assets/_Project/Scripts/Client/Presentation/AimReticleSystem.cs

@@ -51,7 +51,7 @@ namespace ProjectM.Client
         protected override void OnUpdate()
         {
             byte scheme = AimPresentation.Scheme;
-            if (_camera == null) _camera = ResolveCamera();
+            if (_camera == null) _camera = CameraResolver.Resolve();
 
             bool haveTarget = false;
             float3 ringPos = default;
@@ -157,16 +157,7 @@ namespace ProjectM.Client
             }
         }
 
-        UnityEngine.Camera ResolveCamera()
-        {
-            var cam = UnityEngine.Camera.main;
-            if (cam == null)
-            {
-                var rig = UnityEngine.Object.FindAnyObjectByType<PrototypeCameraRig>();
-                if (rig != null) cam = rig.GetComponent<UnityEngine.Camera>();
-            }
-            return cam;
-        }
+
 
         protected override void OnDestroy()
         {

Assets/_Project/Scripts/Client/Presentation/CameraResolver.cs

@@ -0,0 +1,21 @@
+namespace ProjectM.Client
+{
+    /// <summary>
+    /// Resolves the gameplay camera for the client systems that cursor-raycast against the ground (input aim,
+    /// build placement, aim reticle): <see cref="UnityEngine.Camera.main"/>, falling back to the
+    /// <see cref="PrototypeCameraRig"/>'s Camera. Single source so the camera-resolution policy lives in one place.
+    /// </summary>
+    public static class CameraResolver
+    {
+        public static UnityEngine.Camera Resolve()
+        {
+            var cam = UnityEngine.Camera.main;
+            if (cam == null)
+            {
+                var rig = UnityEngine.Object.FindAnyObjectByType<PrototypeCameraRig>();
+                if (rig != null) cam = rig.GetComponent<UnityEngine.Camera>();
+            }
+            return cam;
+        }
+    }
+}

Assets/_Project/Scripts/Client/Presentation/CameraResolver.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 94961d35ebce5d34a80b77b53592b156