feat(client): improve modal and add hang up confirmation

[andrei-gavrilescu]

Add some enhancements to modal (make it can't be clicked through)

Add hang up confirmation.

[saghul]

Excellent work! Pl try to run the e2e tests locally, I bet some of them need to be adjusted for the hangup change.

There are some that fail in the CI, which we can keep ignoring for a while longer.

[andrei-gavrilescu]

Excellent work! Pl try to run the e2e tests locally, I bet some of them need to be adjusted for the hangup change.

There are some that fail in the CI, which we can keep ignoring for a while longer.

Seems like these fail randomly, it might have something to do with the duplicate events problem, I'll check to see if adding a fix there makes them more consistent.