Warnings and notifications upon verifying Signal number

To prevent any confusion surrounding the implications of associating the local number to the haven device, some testers have requested a glaring, "are you sure?" confirmation that the user has to tap through.

Similarly, feedback once the number has successfully verified would improve the overall experience.

Start by locating the Signal number verification flow in the Android app and inspect where the number is associated and verification succeeds. Add a confirmation step explaining the association's implications and feedback after successful verification; done means both moments are clearly communicated to testers.

Written by the indexing model from the issue text.