feat(wm): use ghost windows for movement animations

This commit tries to render move/resize animations on a DWM-thumbnail
"ghost" window instead of calling MoveWindow per-frame on the real HWND.

The source is cloaked via IApplicationView::SetCloak, the thumbnail is
animated via DwmUpdateThumbnailProperties on a layered host owned by a
single "ghost owner" thread, the border for the source follows the
lerped rect via a new WM_ANIMATE_RECT message handled on the border's
own WndProc thread (preserving today's per-frame border tracking), and
the real SetWindowPos happens once at the end of the animation.

Apps repaint exactly once per animation instead of N times, which is a
substantial win for heavy renderers (browsers, IDEs, Office). For
non-Chromium sources the source is also pre-positioned to target_rect
before the thumbnail is registered so the captured texture is target-
sized and downscales to native 1:1 at the end of the animation rather
than upscaling to a stretched/blurry final frame.

Chromium-shell sources  skip the pre-paint step: their
NativeWindowOcclusionTrackerWin reads DWMWA_CLOAKED and treats any cloak
value as hidden, suspending the renderer; WM_SIZE while cloaked produces
no new frame and the post-uncloak swap chain shows stale or black
content.

For those apps we keep the source cloaked at start_rect for the whole
animation and do the SetWindowPos in post_render after uncloak, where
the visibility flip is what wakes Viz back up.

A short ease-in opacity crossfade in post_render masks the texture
transition for the Chromium path and gives slow renderers time to
present their first post-resize frame before the overlay is removed.

schema.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "title": "StaticConfig",
-  "description": "The `komorebi.json` static configuration file reference for `v0.1.41`",
+  "description": "The `komorebi.json` static configuration file reference for `v0.1.42`",
   "type": "object",
   "properties": {
     "animation": {
@@ -778,6 +778,14 @@
           "default": 60,
           "minimum": 0
         },
+        "ghost_movement": {
+          "description": "Render movement animations on a GPU-composited ghost surface (recommended).\nWhen false, falls back to the legacy per-frame MoveWindow path.",
+          "type": [
+            "boolean",
+            "null"
+          ],
+          "default": true
+        },
         "style": {
           "description": "Set the animation style",
           "anyOf": [