fix(borders): floating window z-order handling

This commit makes it so a floating window only has the floating border
when it is focused, if not it has the `Unfocused` border. It also makes
the 'focused_container' have the `Unfocused` border when it is not the
foreground window, for example when we have a floating window focused
instead.

This commit also changes the border's `window_kind` so that the stored
borders actually have that value so we can check it later (This value
wasn't being updated).

This commit also makes it so we properly invalidate the borders in the
situations discussed above (for example when changing focus to/from a
floating window we need the floating window border to update its ZOrder
as well as the previously focused window).

Lastly this commit, changes the `WM_PAINT` code part of the border so
that it now sets the position of border so that the border's ZOrder
updates to it's tracking window ZOrder.

komorebi/src/border_manager/border.rs

@@ -425,6 +425,18 @@ impl Border {
                             return LRESULT(0);
                         }
 
+                        let reference_hwnd = (*border_pointer).tracking_hwnd;
+
+                        // Update position to update the ZOrder
+                        let border_window_rect = (*border_pointer).window_rect;
+
+                        tracing::trace!("updating border position");
+                        if let Err(error) =
+                            (*border_pointer).set_position(&border_window_rect, reference_hwnd)
+                        {
+                            tracing::error!("failed to update border position {error}");
+                        }
+
                         if let Some(render_target) = (*border_pointer).render_target.get() {
                             (*border_pointer).width = BORDER_WIDTH.load(Ordering::Relaxed);
                             (*border_pointer).offset = BORDER_OFFSET.load(Ordering::Relaxed);