Formalize scene viewport navigation input helpers

editor/src/Viewport/SceneViewportEditorModes.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <cstdint>
+
+namespace XCEngine {
+namespace Editor {
+
+enum class SceneViewportToolMode : uint8_t {
+    ViewMove = 0,
+    Move,
+    Rotate,
+    Scale,
+    Transform
+};
+
+enum class SceneViewportPivotMode : uint8_t {
+    Pivot = 0,
+    Center
+};
+
+enum class SceneViewportTransformSpaceMode : uint8_t {
+    Global = 0,
+    Local
+};
+
+} // namespace Editor
+} // namespace XCEngine