fixing pop-up modals behaviour

android
google pixel pro 7

some of the pop-up modals appear to behave a bit strange, it might be according to different constraints but I think we can optimize them to look better..

# worldview explainer info modal
this modal appears to be too big to fit on my screen when I open it, it looks like the top and bottom are cut off , I cannot scroll the modal either. it seems to be limited by the size of the parent component, such as the poll details page's length on the screen, in some cases I cannot even see or touch the okay button to close it


## solution suggestion
we need to ensure that this component can take up all the space it needs from the top of the mini-app header to the bottom of the user's screen, not limited by the size of the poll details component.

# voting success modal
on polls that have lots of options the page is then quite long - when the success modal shows it can show in area barely visible to the user, the user would need to scroll to find where it is

https://github.com/user-attachments/assets/698f1f46-ff3a-45f4-85f5-ae46b6b07d46

## solution suggestion
make modal position absolute inside of parent component