use-multiple selection and dragging inside multiple selection but white area

src/pods/canvas/use-multiple-selection-shape.hook.tsx

// There's a bug here: if you make a multiple selectin and start dragging
// inside the selection but on a blank area it won't drag the selection
// it will just clear the selection
//
// What do we need to do here?
//
// We could get the selection transformer current coords and size
// - if the mouseDown event is click inside that rectangle abort the multiple selection by dragging
// - We can set a temporary flag here
// - When user moves check the flag
// - When user mouse up then reset the flag to false

Start in src/pods/canvas/use-multiple-selection-shape.hook.tsx and reproduce the interaction described: drag from a blank area inside an existing multiple selection. Trace the mouse-down, move, and mouse-up handling. Done means dragging from that area moves the selection instead of clearing it, while selection behavior outside it remains unchanged.