wm: title-bar drag-to-move; stop delivering title-bar gestures to apps

- Track the active mouse gesture (none / window-move / app-stroke) so a
  press on the title bar becomes a move drag instead of leaking Move
  events into the app's content
- Add move_window (clamped to the canvas, repaint old + new regions)
- Always deliver MouseKind::Release so a stroke that ends outside the
  window still terminates

1 files changed, 2 insertions, 2 deletions

diff --git a/docs/adr/0004-windowed-gui-and-compositor.md b/docs/adr/0004-windowed-gui-and-compositor.md
index 86e8b30..3476fab 100644
--- a/docs/adr/0004-windowed-gui-and-compositor.md
+++ b/docs/adr/0004-windowed-gui-and-compositor.md
@@ -62,8 +62,8 @@ Introduce an overlapping-window GUI:
   console (app 0) never closes.
 - **Placement** — new windows cascade (+24px each, wrapping) and are
   focused and raised on creation; the console is full-canvas at (0,0).
-  Windows are fixed-position and fixed-size in v1: move is the first
-  post-v1 feature and resize is deferred.
+  Windows are movable by dragging the title bar (clamped to the canvas);
+  resize is deferred.
 
 ## Consequences