Add settings screen header to match UI design

[pierrelstan]

The settings screen currently does not have a header. Please implement it according to the Figma design:
https://www.figma.com/design/UjbBQIFKATd1DisTBRsMdd/Wallet-Management-System?node-id=377-10528&t=i5fo6T31nm2P6JAM-4

[v1gneshn]

@pierrelstan i have a PR for this

#698