static void RunStudioEditorChecks() {
    EditorApp app;
    app.LoadLevel("../assets/map.dat");
    auto original=app.CaptureSnapshot();
    auto before=original;
    app.RecordLevelEdit(before,71);
    Check(app.undoStack.empty(),"selection-only gesture creates no undo entry");
    app.playerStartX=7;
    app.RecordLevelEdit(before,71);
    before=app.CaptureSnapshot(); app.playerStartX=8; app.RecordLevelEdit(before,71);
    Check(app.undoStack.size()==1,"continuous inspector gesture creates exactly one snapshot");
    app.RecordLevelEdit(app.CaptureSnapshot(),0);
    before=app.CaptureSnapshot(); app.floorColor=0; app.RecordLevelEdit(before,72);
    Check(app.undoStack.size()==2,"next property edit gets an independent snapshot");
    app.Undo(); Check(app.playerStartX==8 && app.floorColor==original.floorColor,"undo palette preserves preceding transform");
    app.Undo(); Check(EditorApp::SameLevel(app.CaptureSnapshot(),original),"undo continuous transform restores initial state");
    app.Redo(); app.Redo(); Check(app.playerStartX==8 && app.floorColor==0,"redo restores both authored edits");
    app.Undo(); before=app.CaptureSnapshot(); app.ceilingColor=123; app.RecordLevelEdit(before,0);
    Check(app.redoStack.empty(),"new edit after undo invalidates redo branch");

    before=app.CaptureSnapshot();
    app.sprites[0].x+=10; app.sprites[0].scale=131072; app.sprites[0].textureId=13;
    SetSpriteEntityData(app.sprites[0],ENTITY_ARCHETYPE_GUARD,55,3,8);
    app.transitions[0].targetSpawnX=9; app.transitions[0].targetAngle=128;
    strcpy_s(app.transitions[0].targetMap,"other.dat");
    app.cutscene.flags=CUTSCENE_AUTOPLAY;
    app.RecordLevelEdit(before,0);
    app.draggingLightRadiusIdx=2; app.strokeSnapshotTaken=true; app.Undo();
    Check(EditorApp::SameLevel(app.CaptureSnapshot(),before),"snapshot restores sprite parameters portal names and cutscene flags together");
    Check(app.draggingLightRadiusIdx==-1 && !app.strokeSnapshotTaken,"undo cancels light-radius drag and paint stroke");
    for(int i=0;i<80;++i) {before=app.CaptureSnapshot(); app.floorColor=i+1; app.RecordLevelEdit(before,0);}
    Check(app.undoStack.size()==64,"history remains bounded to sixty-four snapshots");

    BinaryLevel level; std::string error;
    ReadLevelFile("../assets/map.dat",level,error);
    level.cells[10*32+10]=CELL_DOOR;
    SetSwitchDoor(level.sprites[0],10,10,true);
    Check(ValidateLevel(level,error) && HasSwitchDoor(level.sprites[0]),"switch binding uses existing v5 sprite bytes");
    level.cells[10*32+10]=CELL_EMPTY;
    Check(!ValidateLevel(level,error),"switch binding cannot target a non-door cell");
    level.cells[10*32+10]=CELL_DOOR;
    level.sprites.push_back(level.sprites[0]);
    Check(!ValidateLevel(level,error),"duplicate door bindings are rejected");
    level.sprites.pop_back(); level.sprites[0].flags|=0x20000000;
    Check(!ValidateLevel(level,error),"out-of-bounds switch target is rejected");

    // Drive actual ImGui inspector controls, not a duplicate model of UI edits.
    ImGui::CreateContext();
    auto& io=ImGui::GetIO(); io.IniFilename=nullptr; io.DisplaySize=ImVec2(1400,1000); io.DeltaTime=1.0f/60;
    unsigned char* pixels; int w,h; io.Fonts->GetTexDataAsRGBA32(&pixels,&w,&h);
    app.LoadLevel("../assets/map.dat"); app.selectedSpriteIdx=-1; app.selectedTransitionIdx=-1;
    auto frame=[&](const char* target, const char* text) {
        if(text) io.AddInputCharactersUTF8(text);
        ImGui::NewFrame();
        ImGui::SetNextWindowPos(ImVec2(0,0)); ImGui::SetNextWindowSize(ImVec2(600,950));
        ImGui::Begin("InspectorTest",nullptr,ImGuiWindowFlags_NoSavedSettings);
        if(target) {
            auto& g=*ImGui::GetCurrentContext();
            g.NavActivateId=g.NavActivateDownId=ImGui::GetID(target); g.NavActivateFlags=ImGuiActivateFlags_PreferInput;
        }
        app.RenderInspector();
        ImGui::End(); ImGui::Render();
    };
    frame(nullptr,nullptr);
    frame("Spawn X",nullptr);
    frame(nullptr,"7");
    io.AddKeyEvent(ImGuiKey_Enter,true); frame(nullptr,nullptr);
    io.AddKeyEvent(ImGuiKey_Enter,false); frame(nullptr,nullptr);
    Check(app.playerStartX==7 && app.undoStack.size()==1,"real inspector spawn input records original authored state");
    app.Undo(); Check(app.playerStartX==2,"real inspector spawn input can be undone");
    app.Redo(); Check(app.playerStartX==7,"real inspector spawn input can be redone");
    app.selectedSpriteIdx=0;
    frame(nullptr,nullptr);
    auto oldX=app.sprites[0].x; auto count=app.undoStack.size();
    frame("Позиция X",nullptr); frame(nullptr,"6");
    io.AddKeyEvent(ImGuiKey_Enter,true); frame(nullptr,nullptr);
    io.AddKeyEvent(ImGuiKey_Enter,false); frame(nullptr,nullptr);
    Check(app.sprites[0].x==384 && app.undoStack.size()==count+1,"real sprite inspector transform participates in history");
    app.Undo(); Check(app.sprites[0].x==oldX,"real sprite inspector undo restores raw world coordinates");
    app.selectedSpriteIdx=-1; app.selectedTransitionIdx=0;
    auto oldSpawn=app.transitions[0].targetSpawnX; count=app.undoStack.size();
    frame(nullptr,nullptr); frame("Целевой Spawn X",nullptr); frame(nullptr,"11");
    io.AddKeyEvent(ImGuiKey_Enter,true); frame(nullptr,nullptr);
    io.AddKeyEvent(ImGuiKey_Enter,false); frame(nullptr,nullptr);
    Check(app.transitions[0].targetSpawnX==11 && app.undoStack.size()==count+1,"real portal destination input records a transaction");
    app.Undo(); Check(app.transitions[0].targetSpawnX==oldSpawn,"real portal destination undo restores original spawn");
    app.selectedTransitionIdx=-1;
    auto oldPalette=app.CaptureSnapshot(); count=app.undoStack.size();
    frame(nullptr,nullptr); frame("Хоррор",nullptr); frame(nullptr,nullptr);
    Check(app.ceilingColor==0x003B0710 && app.undoStack.size()==count+1,"real environment preset records both colors once");
    app.Undo(); Check(app.ceilingColor==oldPalette.ceilingColor && app.floorColor==oldPalette.floorColor,
        "real environment preset undo restores ceiling and floor");
    app.viewportMode=2; app.showCutsceneTimeline=false;
    auto uiBefore=app.CaptureSnapshot(); count=app.undoStack.size();
    for (float width : {1000.0f,1360.0f,1920.0f}) {
        io.DisplaySize=ImVec2(width,840);
        app.contentDrawerOpen=true;
        ImGui::NewFrame(); app.RenderUI(); ImGui::Render();
        ImGui::NewFrame(); app.RenderUI(); ImGui::Render();
    }
    Check(ImGui::GetDrawData()->TotalVtxCount>0 && app.editDepth==0,
        "full workspace and content drawer render at supported window widths");
    Check(EditorApp::SameLevel(uiBefore,app.CaptureSnapshot()) && app.undoStack.size()==count,
        "workspace layout and content browsing do not dirty authored history");
    ImGui::DestroyContext();
}