Expose data to let consumers render their own tab overflow popover

[DanielGarciaGuillen]

Is your feature request related to a problem? Please describe. When tabs overflow, Dockview renders a built-in overflow menu. I would like to render my own menu for consistent styling and accessibility but I don’t have access to the data or render hooks to do so.

Describe the solution you'd like Expose an API or render prop that provides the overflow tab data so I can render the overflow trigger and menu myself.

Describe alternatives you've considered CSS tweaks: can’t customize where the popover is being rendered

Additional context When the overflow tabs menu is open and the window is resized, the popover shifts to the wrong position and no longer aligns correctly.