fix(editor): rotation drag accumulates without wrap (UE session semantics)

Dragging rotation hit a wall at the wrap point: each frame re-read
euler from the quat and wrapped to [0,360), so dragging past 360
snapped the display back to 0 (and backwards dragging wrapped up to
360) -- values "jumped around" instead of accumulating.

Port UE TransformDetails session semantics: the rotation row shows a
local mirror value while the user edits it (accumulating freely in
both directions, never wrapping), and re-syncs from the quat only on
foreign changes (gizmo drag, physics writeback, entity switch).
Detection is exact component-wise quat equality: the mirror quat comes
from the same QuatFromEuler used by SetRotation, so an untouched pair
compares bit-equal, while any foreign writeback -- including sub-0.05
degree gizmo steps that a dot-product threshold would miss -- differs
in at least one float. Edit frames skip the check (mirror leads the
quat by one drag delta), gated on the previous frame's item-active
state.

App/editor/InspectorPanel.cpp

@@ -78,7 +78,7 @@ namespace
     // TransformComponent::GetRotation 注释）
     bool DragVec3Row(const char* label, glm::vec3& v, float speed,
                      float mn = -3.4e38f, float mx = 3.4e38f,
-                     const char* fmt = "%.2f")
+                     const char* fmt = "%.2f", bool* editing = nullptr)
     {
         ImGui::TextUnformatted(label);
         ImGui::SameLine(72.0f);   // 固定标签列宽 → 三行输入框对齐
@@ -101,6 +101,11 @@ namespace
             changed |= ImGui::DragFloat(
                 i == 0 ? "##x" : i == 1 ? "##y" : "##z",
                 &v[i], speed, mn, mx, fmt);
+            if (editing != nullptr)
+            {
+                // 拖拽中/输入框打开中（含无拖动的按住帧）
+                *editing |= ImGui::IsItemActive();
+            }
             ImGui::PopStyleColor();
             if (i < 2) ImGui::SameLine();
         }
@@ -215,17 +220,61 @@ void InspectorPanel::Draw(const EditorContext& ctx, entt::entity selected)
             {
                 t->SetPosition(pos);
             }
-            glm::vec3 rot = t->GetRotation();   // 派生欧拉（度）
+            // ---- rotation 行：编辑 mirror（UE TransformDetails 会话语义）----
-            for (int i = 0; i < 3; ++i)
+            // 每帧回读 quat 反解 + wrap 会让拖动乱跳（360 → 0 折返）。
+            // UE 做法 = 编辑会话内显示本地累计值（正拖无限增大、反拖
+            // 无限减小、永不折返），只有"非编辑来源"的姿态改动（Gizmo、
+            // 物理、重选）才刷新显示。ImGui 无状态 → static mirror：
+            // 切换实体重置；非编辑态用 quat 位级等价检测判定外部改动
+            static unsigned s_MirrorEntity = 0;
+            static glm::vec3 s_RotMirror(0.0f);
+            static bool s_MirrorValid = false;
+            static bool s_RotEditingLast = false;   // 上一帧是否在编辑
+            const unsigned entityId =
+                static_cast<unsigned>(entt::to_integral(selected));
+            if (entityId != s_MirrorEntity)
             {
-                if (rot[i] == 0.0f) rot[i] = 0.0f;   // 清 -0.0（atan2 副产物）
+                s_MirrorEntity = entityId;
+                s_MirrorValid = false;
             }
-            // "%.1f" = UE Details 默认显示精度（反解噪声 ~0.02° @ pitch 90°，
+            bool editingRot = false;
-            // 存储端 quat 精确；手输 Ctrl+Click 仍全精度写入）
+            if (s_MirrorValid)
-            if (DragVec3Row("rotation", rot, 0.5f, -3.4e38f, 3.4e38f, "%.1f"))
+            {
+                if (!s_RotEditingLast)
+                {
+                    // 非编辑帧才检测外部改动（编辑帧 mirror 领先 quat 一个
+                    // 拖动增量，等价检测必触发误重置）。编辑态取上一帧
+                    // ——检测先于本帧 DragVec3Row 执行。
+                    // 判据 = 逐分量相等：QuatFromEuler 与 SetRotation 是
+                    // 同一函数，mirror 未被外部动过时位级相同（== 无浮点
+                    // 噪声问题，比 dot 阈值严——Gizmo 极慢拖 0.05°/帧
+                    // 的 quat 差 ~1e-7，dot 阈值法会漏检导致显示不跟手）
+                    const glm::quat mq =
+                        Engine::ECS::TransformComponent::QuatFromEuler(s_RotMirror);
+                    const glm::quat& aq = t->GetRotationQuat();
+                    const bool untouched = mq.x == aq.x && mq.y == aq.y &&
+                                           mq.z == aq.z && mq.w == aq.w;
+                    if (!untouched)
+                    {
+                        s_RotMirror = t->GetRotation();   // 外部改动 → 刷新
+                    }
+                }
+            }
+            else
+            {
+                s_RotMirror = t->GetRotation();
+                s_MirrorValid = true;
+            }
+            glm::vec3 rot = s_RotMirror;
+            // "%.1f" = UE Details 默认显示精度。mirror 值直显（无 wrap、
+            // 无限累计）；Ctrl+Click 手输全精度写入
+            if (DragVec3Row("rotation", rot, 0.5f, -3.4e38f, 3.4e38f,
+                            "%.1f", &editingRot))
             {
                 t->SetRotation(rot);
+                s_RotMirror = rot;
             }
+            s_RotEditingLast = editingRot;
             glm::vec3 scl = t->GetScale();
             if (DragVec3Row("scale", scl, 0.02f, 0.001f, 100.0f))
             {

Engine/include/Engine/ECS/Components.h

@@ -98,13 +98,20 @@ namespace Engine::ECS {
         TransformComponent& SetPosition(const glm::vec3& p) { if (m_Position != p) { m_Position = p; m_Dirty = true; } return *this; }
         // 欧拉角（度）入口：UI/游戏逻辑用。转 quat 存（q = qy·qx·qz，
         // 与原 Ry·Rx·Rz 合成严格同构；不能用 glm::quat(euler) ctor——
-        // 那是 ZYX 航向序，语义不同）
+        // 那是 ZYX 航向序，语义不同）。输入域无限制：三角函数周期性
+        // 自动归一（720 ≡ -45 ≡ 315），编辑器拖动累计值直接喂
         TransformComponent& SetRotation(const glm::vec3& r)
+        {
+            return SetRotationQuat(QuatFromEuler(r));
+        }
+        // 欧拉（度）→ quat 的唯一转换点（qy·qx·qz）。static 供编辑器
+        // mirror 的旋转等价检测复用（同一公式构造 → dot 判定严格）
+        static glm::quat QuatFromEuler(const glm::vec3& r)
         {
             const glm::quat qx = glm::angleAxis(glm::radians(r.x), glm::vec3(1, 0, 0));
             const glm::quat qy = glm::angleAxis(glm::radians(r.y), glm::vec3(0, 1, 0));
             const glm::quat qz = glm::angleAxis(glm::radians(r.z), glm::vec3(0, 0, 1));
-            return SetRotationQuat(qy * qx * qz);
+            return qy * qx * qz;
         }
         // 四元数直写（UE FTransform 语义）：Gizmo 拖拽/物理写回用，
         // 不经欧拉往返 → 零漂移、无万向锁