backend-infra-engineer: Release v0.3.9-hotfix7 snapshot

test/e2e/dungeon_canvas_interaction_test.h

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+#ifndef YAZE_TEST_E2E_DUNGEON_CANVAS_INTERACTION_TEST_H
+#define YAZE_TEST_E2E_DUNGEON_CANVAS_INTERACTION_TEST_H
+
+#include "imgui_test_engine/imgui_te_context.h"
+
+/**
+ * @brief Tests for dungeon canvas pan and zoom interactions
+ *
+ * Verifies that the dungeon room canvas supports:
+ * - Mouse wheel zoom in/out
+ * - Right-click drag to pan the view
+ * - View reset functionality
+ */
+void E2ETest_DungeonCanvas_PanZoom(ImGuiTestContext* ctx);
+
+/**
+ * @brief Tests for object selection on the dungeon canvas
+ *
+ * Verifies that clicking on the canvas:
+ * - Selects objects at the clicked position
+ * - Deselects when clicking empty space
+ * - Shows selection highlight on selected objects
+ */
+void E2ETest_DungeonCanvas_ObjectSelection(ImGuiTestContext* ctx);
+
+/**
+ * @brief Tests for grid snap behavior when placing objects
+ *
+ * Verifies that objects snap to the 8x8 grid:
+ * - Object placement aligns to grid boundaries
+ * - Object movement respects grid snapping
+ */
+void E2ETest_DungeonCanvas_GridSnap(ImGuiTestContext* ctx);
+
+/**
+ * @brief Tests for multi-select functionality with shift-click
+ *
+ * Verifies that shift-click:
+ * - Adds objects to current selection
+ * - Allows selecting multiple objects
+ * - Selection can be cleared with click on empty space
+ */
+void E2ETest_DungeonCanvas_MultiSelect(ImGuiTestContext* ctx);
+
+#endif  // YAZE_TEST_E2E_DUNGEON_CANVAS_INTERACTION_TEST_H