feat(desktop): 작업 표시줄 아이콘 기능 추가

Author: ThunderVolt45

AGENTS.md

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+# AGENTS.md
+
+This repository is a Unity sample project for building a desktop-OS-style window UI using only UGUI.
+
+## Project Basics
+
+- Unity version: `6000.2.6f2` or newer.
+- Main sample scene: `Assets/UGUIWindowSample/Scenes/UGUIWindowSampleScene.unity`.
+- Core code lives under `Assets/UGUIWindowSample/Scripts/`.
+- Window prefabs are loaded by convention from `Assets/Resources/Windows/{ClassName}.prefab`.
+- Public-facing documentation starts at `README.md` and `docs/Manual.md`.
+
+## Important Docs
+
+Read these before changing behavior:
+
+- `docs/manual/02-concepts.md` for architecture, pooling, z-order, and DPI.
+- `docs/manual/03-creating-windows.md` for creating custom windows and prefab naming.
+- `docs/manual/06-events-lifecycle.md` for open, close, focus, and minimize events.
+- `docs/manual/07-samples.md` for the desktop sample scene.
+- `docs/manual/08-api-reference.md` for public APIs.
+- `docs/ClassDiagram.md` and `docs/class-diagram/*.md` for class relationships.
+
+## Architecture Notes
+
+- `UGUIWindowManager` is the singleton entry point for window creation, pooling, z-order, DPI scaling, and ESC handling.
+- `UGUIWindow` is the controller for each window. It owns the window mode and exposes:
+  - `OnOpenWindow`
+  - `OnCloseWindow`
+  - `OnFocusWindow`
+  - `OnMinimizeWindow`
+- `UGUIWindowView` owns visual state such as header, border, buttons, fade, and maximized/restored layout.
+- `UGUIWindowState` stores position, size, anchors, and flags for restore behavior.
+- The sample desktop layer is in `Assets/UGUIWindowSample/Scripts/Sample/`.
+
+## Implementation Guidelines
+
+- Prefer existing patterns over new abstractions.
+- Keep base window-system changes small and reusable.
+- Put demo-only behavior in the `Sample` folder unless the feature belongs to the framework.
+- When overriding `UGUIWindow.Awake` or `UGUIWindow.OnEnable`, call `base` first.
+- Use `UGUIWindowLog` for project logs instead of raw `Debug.Log` in framework code.
+- Preserve object pooling behavior unless the task explicitly changes it.
+- For features that observe window state, prefer subscribing to existing window events instead of polling.
+- Avoid editing Unity prefab or scene YAML by hand unless the change is small, deliberate, and easy to verify.
+
+## Unity Asset Guidelines
+
+- Keep `.meta` files with their assets.
+- Use forward slashes in Unity asset paths.
+- Do not rename prefab/class pairs casually; window loading depends on class-name-to-prefab-name matching.
+- If creating a new window class, add the matching prefab under `Assets/Resources/Windows/`.
+- If changing serialized fields, consider whether existing prefabs need their references assigned in Unity.
+
+## Testing And Verification
+
+- If Unity MCP/editor tools are available, use them to check compilation after C# changes.
+- At minimum, inspect changed C# files and run repository searches for broken references.
+- For UI work, verify the sample scene still covers:
+  - create/open
+  - focus/z-order
+  - minimize/restore
+  - close/pooling
+  - DPI changes
+
+## Current Sample Flow
+
+- `UGUIDesktop` gathers child `UGUIIcon` components and spawns a few demo windows on `Start`.
+- `UGUIIcon` opens a window by resolving `UGUIWindow.{targetClassName}` on double click.
+- `UGUIMenu` opens the settings window and can quit the app.
+- `UGUIApplicationSetting` applies resolution, fullscreen mode, framerate, and DPI changes.
+