fix: clicking WINGs dialog surface now focuses the window

The click-to-focus code only checked wl_toplevel_view surfaces
(real Wayland/XWayland clients). WINGs dialogs are frame_bufs,
not toplevel views, so view_surface_at returned NULL and focus
was never set.

Add fallback: when no toplevel surface is under the pointer,
check if a WINGs dialog frame_buf (ID >= 0x20000000) was hit
and focus its associated WWindow.

src/backend/wayland/wl_backend.c

@@ -5206,6 +5206,19 @@ handle_pointer_button(struct wl_listener *listener, void *data)
                 wl_list_remove(&view->link);
                 wl_list_insert(&wl_state.toplevel_list, &view->link);
             }
+        } else {
+            /* No toplevel surface — check if a WINGs dialog frame_buf was clicked */
+            struct wl_frame_buf *hit = frame_buf_hit(wl_state.pointer_x,
+                                                     wl_state.pointer_y);
+            if (hit && hit->id >= 0x20000000) {
+                WObjDescriptor *desc =
+                    wm_backend->context_find(hit->id, WM_CTX_CLIENT_WIN);
+                if (desc && desc->parent_type == WCLASS_WINDOW) {
+                    WWindow *wwin = (WWindow *)desc->parent;
+                    WScreen *scr = wScreenWithNumber(0);
+                    wSetFocusTo(scr, wwin);
+                }
+            }
         }
     }