Keep rotateZ on elements with a layout animation

The projection pipeline handled rotate, rotateX and rotateY but not
rotateZ, so a layout or shared layout animation silently dropped it from
the generated transform and never mixed it between lead and follow.

packages/motion-dom/src/projection/styles/__tests__/transform.test.ts

@@ -102,4 +102,35 @@ describe("buildProjectionTransform", () => {
             buildProjectionTransform(delta, { x: 1, y: 1 }, { rotate: 10 })
         ).toEqual("translate3d(100px, 100px, 0px) rotate(10deg) scale(2, 4)")
     })
+
+    it("Applies rotateZ", () => {
+        const delta = {
+            x: {
+                translate: 100,
+                scale: 2,
+                origin: 0.5,
+                originPoint: 100,
+            },
+            y: {
+                translate: 100,
+                scale: 4,
+                origin: 0.5,
+                originPoint: 100,
+            },
+        }
+
+        expect(
+            buildProjectionTransform(delta, { x: 1, y: 1 }, { rotateZ: 10 })
+        ).toEqual("translate3d(100px, 100px, 0px) rotateZ(10deg) scale(2, 4)")
+
+        expect(
+            buildProjectionTransform(
+                delta,
+                { x: 1, y: 1 },
+                { rotate: 45, rotateX: 20, rotateY: 30, rotateZ: 10 }
+            )
+        ).toEqual(
+            "translate3d(100px, 100px, 0px) rotate(45deg) rotateX(20deg) rotateY(30deg) rotateZ(10deg) scale(2, 4)"
+        )
+    })
 })

packages/motion-dom/src/projection/styles/transform.ts

@@ -36,6 +36,7 @@ export function buildProjectionTransform(
             pathRotation,
             rotateX,
             rotateY,
+            rotateZ,
             skewX,
             skewY,
         } = latestTransform
@@ -46,6 +47,7 @@ export function buildProjectionTransform(
         if (pathRotation) transform += `rotate(${pathRotation}deg) `
         if (rotateX) transform += `rotateX(${rotateX}deg) `
         if (rotateY) transform += `rotateY(${rotateY}deg) `
+        if (rotateZ) transform += `rotateZ(${rotateZ}deg) `
         if (skewX) transform += `skewX(${skewX}deg) `
         if (skewY) transform += `skewY(${skewY}deg) `
     }