fix: prevent MultiSelect overlay from closing on drag-end events orig…

[mustafajw07]

Defect Fixes

Fixes #8517

Describe the bug:
When using MultiSelect with filtering enabled, if a user clicks and drags to select text inside the filter input, and then releases the mouse outside the panel boundary, the overlay unexpectedly closes. This makes normal text-selection behavior feel broken because the panel is dismissed even though the interaction started inside the multiselect component.

Expected behavior:
The overlay should remain open. Releasing the mouse outside after starting a text-selection or drag interaction inside the MultiSelect component should not be treated as an outside dismiss action.

Solution:
Implemented a mousedownInsideOverlay ref to track where the mousedown event originated. Added a document mousedown listener (active only while the overlay is visible) to set this flag if the target is within the MultiSelect trigger or overlay. In the useOverlayListener's outside-click handler, we now ignore the dismiss action if the preceding mousedown originated inside the component, preventing unintended closures during drag-and-drop or text-selection gestures.

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