move is a mode: grab, drag, done

surfaces/quickshell/services/ViewtopControl.qml

@@ -121,6 +121,18 @@ Singleton {
         });
     }
 
+    // Hand a window to the finger. While grabbed, one-finger drags move it;
+    // `drop` ends the mode. This is Move as a *mode* rather than a computed
+    // geometry — the three-finger carry that used to do it lost a race with
+    // the three-finger tap every time, so it is entered on purpose now.
+    function grab(id) {
+        root.scene("grab", { id: id });
+    }
+
+    function drop() {
+        root.scene("drop", {});
+    }
+
     function raise(id) {
         root.scene("raise", { id: id });
     }