feat: 旋转单位改为度并支持轨迹点拖拽

统一数据模型中的旋转为度数并在渲染时转弧度，新增 InspectorAngleField 角度控件，为场景与轨迹点提供滑块和重置按钮；选中轨迹点时角色预览到该点并支持拖拽 gizmo 调整位置；机位点击统一走 selectObject 以正确切换右侧属性卡片。

src/editor/canvas/SceneRoot.test.tsx

@@ -2,6 +2,7 @@ import { fireEvent, render, screen, waitFor } from "@testing-library/react";
 import { Box3, DoubleSide, Vector3 } from "three";
 import { afterEach, beforeEach, vi } from "vitest";
 import { VIEWPORT_CAMERA_VISUAL_SCALE } from "../schema/cameraGeometry";
+import { degreesRotationToRadians } from "../schema/directorProject";
 import { createInitialDirectorState, useDirectorStore } from "../store/directorStore";
 import { getImportedModelNormalization, getTrajectoryGroundPoint, SceneRoot } from "./SceneRoot";
 import { AXIS_COLORS } from "./sceneAxes";
@@ -331,7 +332,7 @@ it("keeps the ground plane inside the shared scene transform group", () => {
         ...useDirectorStore.getState().project.scene,
         scale: 2,
         position: [1, 3, -2],
-        rotation: [0, 0.5, 0],
+        rotation: [0, 90, 0],
         groundHeight: 1.5,
       },
     },
@@ -342,7 +343,8 @@ it("keeps the ground plane inside the shared scene transform group", () => {
 
   // 地面所在的场景组必须和视口网格用同一套变换，否则会分成两层不同高度的地面
   expect(groundPlane).toHaveAttribute("position", "1,3,-2");
-  expect(groundPlane).toHaveAttribute("rotation", "0,0.5,0");
+  // 场景旋转存的是度数，写进 Three.js group 前会转成弧度（90° → π/2）
+  expect(groundPlane).toHaveAttribute("rotation", degreesRotationToRadians([0, 90, 0]).join(","));
   expect(groundPlane).toHaveAttribute("scale", "2,2,2");
 });
 
@@ -676,6 +678,23 @@ it("renders solid trajectory spheres and a smooth curve through the waypoints",
   expect(container.querySelectorAll('mesh[name^="trajectory-point-"]')).toHaveLength(2);
 });
 
+it("shows a translate gizmo on the selected trajectory point so it can be dragged", () => {
+  useDirectorStore.getState().addTrajectoryPoint("char_default_a", [1, 0, 2]);
+  const pointId = useDirectorStore
+    .getState()
+    .project.objects.find((item) => item.id === "char_default_a")!
+    .trajectoryPoints![0].id;
+  useDirectorStore.getState().selectTrajectoryPoint("char_default_a", pointId);
+
+  render(<SceneRoot />);
+
+  // 选中轨迹点后给该点挂拖拽 gizmo（角色自身的变换 gizmo 此时被抑制，故只有一个）
+  const gizmo = screen.getByTestId("transform-controls");
+  expect(gizmo).toHaveAttribute("data-mode", "translate");
+  expect(gizmo).toHaveAttribute("data-has-object", "true");
+  expect(gizmo).toHaveAttribute("data-hide-from-capture", "true");
+});
+
 it("mounts an invisible ground plane only while placing trajectory points", () => {
   const { container: idleContainer } = render(<SceneRoot />);
   expect(idleContainer.querySelector('mesh[name="trajectory-placement-plane"]')).not.toBeInTheDocument();