Tab preview on hover doesn't work after closing tab until moving the mouse out of tabs bar

[srirambv]

Test plan

See #8902

Original issue description

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[luixxiul]

I noticed it as well, CC @NejcZdovc for thoughts

[NejcZdovc]

@luixxiul problem is that mouse event is not triggered when component update is done. We have two options:

• we add additional event mouseOver which will trigger preview as soon as you move mouse for a pixel (you don't need to move outside the tab bar, but you need to move mouse) - quick solution, but you still need to move mouse for 1 px
• we add a function that will be triggered when component updates and will check where is the pointer and if pointer is inside the component we manually trigger preview (you don't need to move mouse) - not a quick solution, but address the problem 100%

cc @bsclifton

[bbondy]

I think when a tab closes this might fire:
https://github.com/brave/browser-laptop/blob/master/js/stores/windowStore.js#L384
Making it clear the preview frame key. I think we should just be smarter about what to show IF there is already a preview frame.