feat: add treeland-dock-unstable-v1 protocol

CMakeLists.txt

@@ -38,6 +38,7 @@ set(TREELAND_PROTOCOL_DDE_XML_FILES
   dde/treeland-active-notify-unstable-v1.xml
   dde/treeland-region-watch-unstable-v1.xml
   dde/treeland-activation-token-unstable-v1.xml
+  dde/treeland-dock-unstable-v1.xml
 )
 
 # Internal protocol XML files (Treeland-specific, not for general app developers)

dde/README.md

@@ -18,6 +18,7 @@ For DDE desktop components. Installed via `TREELAND_PROTOCOL_DDE_XML_FILES`.
 | `treeland-active-notify-unstable-v1.xml` | `treeland_active_notify_unstable_v1` | `treeland_active_notify_manager_v1`, `treeland_active_notify_v1` | Seat activity notification: observe pointer button/wheel enter/leave activity and drag/drop lifecycle events scoped to a seat |
 | `treeland-region-watch-unstable-v1.xml` | `treeland_region_watch_unstable_v1` | `treeland_region_watch_manager_v1`, `treeland_region_watch_v1` | Edge-anchored region overlap watch: register an edge-anchored region on an output and observe enter/leave overlap events with xdg-shell toplevels |
 | `treeland-activation-token-unstable-v1.xml` | `treeland_activation_token_unstable_v1` | `treeland_activation_token_manager_v1`, `treeland_activation_token_v1` | Privileged xdg-activation-v1 token source for the DDE application manager: mint an activation token for an application it is about to launch; the compositor only checks the caller identity |
+| `treeland-dock-unstable-v1.xml` | `treeland_dock_unstable_v1` | `treeland_dock_manager_v1`, `treeland_dock_v1`, `treeland_dock_hold_v1` | Compositor-managed dock: report the user's visibility mode, which outputs arm the edge wake-up strip, per-interaction holds that block automatic hiding, and forced visibility for conditions the compositor cannot observe such as the launcher; receive the target visibility and the output whose edge the pointer woke. The compositor owns the show/hide animation, edge wake-up, the smart-hide overlap watch, the multitask-overview override, and the reserved area derived from the mode |
 | `treeland-dde-shell-unstable-v2.xml` | `treeland_dde_shell_unstable_v2` | `treeland_dde_shell_manager_v2`, `treeland_dde_shell_surface_v2` | DDE shell surface role: turn a wl_surface into a shell surface rendered at the workspace overlay level (above normal toplevels, below layer-shell surfaces) or at the normal window layer, suggest an initial position relative to an output or the cursor, and declare switcher/dock-preview/multitask-view listing preferences via a skip bitfield |
 
 ## Breaking changes

dde/README.zh_CN.md

@@ -18,6 +18,7 @@
 | `treeland-active-notify-unstable-v1.xml` | `treeland_active_notify_unstable_v1` | `treeland_active_notify_manager_v1`、`treeland_active_notify_v1` | Seat 活跃通知：订阅按 Seat 限定的指针按键/滚轮进入/离开活跃状态及拖拽/放下的生命周期事件 |
 | `treeland-region-watch-unstable-v1.xml` | `treeland_region_watch_unstable_v1` | `treeland_region_watch_manager_v1`、`treeland_region_watch_v1` | 沿输出边缘的区域重叠监控：注册锚定输出边缘的区域并订阅与 xdg-shell 顶层窗口重叠/解除重叠的 enter/leave 事件 |
 | `treeland-activation-token-unstable-v1.xml` | `treeland_activation_token_unstable_v1` | `treeland_activation_token_manager_v1`、`treeland_activation_token_v1` | 面向 DDE 应用管理器的特权 xdg-activation-v1 token 来源：为即将拉起的应用铸造 token，合成器只校验调用方身份 |
+| `treeland-dock-unstable-v1.xml` | `treeland_dock_unstable_v1` | `treeland_dock_manager_v1`、`treeland_dock_v1`、`treeland_dock_hold_v1` | 由合成器接管 Dock 显隐：客户端上报用户显示模式、哪些输出装边缘唤出条带、阻止自动隐藏的交互 hold，以及合成器无法观测的强制显示条件（启动器）；接收目标可见状态与指针触发唤出的输出。显隐动画、边缘唤出、智能隐藏重叠监控、多任务视图覆盖、以及按模式推导的预留区域均由合成器负责 |
 | `treeland-dde-shell-unstable-v2.xml` | `treeland_dde_shell_unstable_v2` | `treeland_dde_shell_manager_v2`、`treeland_dde_shell_surface_v2` | DDE Shell surface 角色：将 wl_surface 转为在工作区 overlay 层（高于普通顶层窗口、低于 layer-shell surface）或普通窗口层渲染的 shell surface，建议相对输出或光标的初始位置，并通过 skip 位域声明任务切换器/dock 预览/多任务视图的列表偏好 |
 
 ## 破坏性变更