feat.airapp与融合桌面

.trae/specs/window-layer-isolation/checklist.md

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+# Checklist
+
+- [x] Air APP window code does not call fused desktop bottom-most APIs.
+- [x] Air APP window code does not set `Topmost = true`.
+- [x] Fused desktop overlay and widget windows still use bottom-most APIs.
+- [x] Fused desktop widget reload path refreshes desktop layer after showing.
+- [ ] Manual Windows z-order verification with fused desktop and Air APP windows.

.trae/specs/window-layer-isolation/spec.md

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+# Window Layer Isolation
+
+## Goal
+
+Keep fused desktop component windows and Air APP windows in separate z-order roles.
+
+## Behavior
+
+- Fused desktop windows are desktop-surface windows. They may use `IWindowBottomMostService` and region passthrough, must stay attached to the Windows desktop icon host when supported, and must not cover ordinary apps.
+- Air APP windows are ordinary application windows. They must not use the fused desktop bottom-most service, must not attach to the desktop icon host, and must not use global `Topmost` promotion.
+- Re-showing or reloading fused desktop widgets refreshes their desktop layer after the window is visible.
+- Air APP activation uses normal window activation; repeated-open foreground recovery remains owned by Launcher lifecycle activation.
+
+## Out of Scope
+
+- Changing Air APP lifecycle IPC.
+- Changing whiteboard note sharing.
+- Implementing third-party Air APP SDK behavior.

.trae/specs/window-layer-isolation/tasks.md

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+# Tasks
+
+- [x] Remove Air APP `Topmost` promotion from `AirAppWindow`.
+- [x] Add explicit desktop-layer refresh for fused desktop widget windows.
+- [x] Refresh fused desktop widget windows after show/reload.
+- [x] Add window-role diagnostics for desktop-surface and Air APP windows.
+- [x] Add static regression tests for window-layer isolation.