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- UIComponents.hpp: UIColor, UIRect, RectTransform, UIStyle, UIWidget, UIButton, UILabel, UIProgressBar, UISlider, UICheckbox - UISystem.hpp: createCanvas/Panel/Button/Label/ProgressBar/Slider/Checkbox, bindValue, hitTest, injectMousePosition/Click, 8-pass layout, processInput - 35 tests in test_ui.cpp covering components, factory, layout, hitTest, onClick/onHoverEnter callbacks, bindValue, siblingOrder - Caffeine.hpp: add UI includes - docs/fase4/ui.md: updated to ✅ with actual implemented API - docs/fase4/README.md: UI System row updated to ✅
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Summary
UIComponents.hpp—UIColor,UIRect,RectTransform,UIStyle,UIWidget,UIButton,UILabel,UIProgressBar,UISlider,UICheckboxUISystem.hpp— retained-mode ECS UI system: factory helpers (createCanvas/Panel/Button/Label/ProgressBar/Slider/Checkbox),bindValue(value binding via getter lambda),hitTest(sibling-order aware), input injection, 8-pass BFS layouttest_ui.cppcovering components, factory, layout, hitTest, click/hover callbacks, bindValue, siblingOrderNotes
UIColorusesf32channels (engineColorusesu8— incompatible with UI float requirements)bindValueusesstd::function<f32(World&)>getter instead ofbindComponent(avoids C++ reflection)forEachdoesn't guarantee topological orderkUIInvalidParent = 0xFFFFFFFFusentinel for root canvassrc/root — compatible with GCC (Linux CI) and MSVC (Windows)