docs: dvui-dev zig-0.17's patches since the OS-window ask

docs/DEPENDENCIES.md

@@ -146,6 +146,14 @@ above rebased onto upstream `main` (`41f6703`), then:
    `FloatingWindowWidget.InitOptions.os_window`, set by `dvui.osWindow`'s floating window, passed
    to `floatingWindowOs` as `asked`. The backend's `floating_os_windows` (`.asked`, `.all`,
    `.none`) says which it shows.
+11. **render: front-to-back blocks and deferred queues** (`ca8d4f8`, `8fa9b9c`): blocks close in
+   O(1), `Window.renderSubwindow` takes a subwindow's commands, and the deferred queues are one
+   unit, replayed in one place.
+12. **floatingWindow: one shown in an OS window draws no background of its own** (`59c45df`): the
+   OS window's material shows through.
+13. **The pointer and its cursor** (`48496b7`, `186a87f`, `1b29a16`): `Window` knows the pointer's
+   kind and a lifted finger hovers nothing; `cursorSet` takes a priority, so a resize handle's
+   cursor wins, and a floating window's edges ask at normal priority.
 
 Tagged `fizzy-sdk-*` when `zig/0.17` merges to `main`, as rule 2 says.