wm: integrate home terminal as window 0 + fix console focus after close

- wm rewrite: chrome flag per window, create_home_window for the
  console (window 0, chrome-less, bottom-pinned, never closed),
  composite_rect fills desktop background then blits windows bottom-to-top,
  draw_window_intersect handles chrome-less windows, hit_test returns
  Content for chrome-less, destroy/move_window no-op for id 0.

- vt: add window_params() so main.rs can wire the Terminal to wm window 0.

- main.rs: create home terminal window 0 and attach Terminal after wm::init().

- Focus fix: focus(0) now stores CONSOLE sentinel (not raw 0) so
  focused() returns None when the home terminal has focus. Without this,
  closing a GUI window left FOCUSED=0, which tty::poll_key() interpreted
  as 'a GUI app has focus', spinning forever and swallowing all keyboard
  input.

1 files changed, 6 insertions, 0 deletions

diff --git a/rsdos/src/main.rs b/rsdos/src/main.rs
index b147e63..6d2fa4a 100644
--- a/rsdos/src/main.rs
+++ b/rsdos/src/main.rs
@@ -413,6 +413,12 @@ pub unsafe extern "efiapi" fn efi_main(image_handle: Handle, system_table: *mut
     // Windowed GUI: initialise the window manager and its input pump.
     // The console (vt) stays layer 0; GUI apps are windows composited on top.
     rsnix::wm::init();
+    {
+        let t = rsnix::vt::home_terminal();
+        let (buf, w, h) = t.window_params();
+        let id = rsnix::wm::create_home_window(buf as *mut u32, w, h);
+        t.set_window(id);
+    }
     rsnix::wm::spawn_input_pump();
 
     shell::run();