[Store Switcher] Improve validation behaviour and store address formatting

[joe-keenan]

The current behaviour makes people wait a long time for validation after tapping “Continue.”

We should run the validation as soon as they tap on a store, but we should allow them to tap other stores in the list during validation. We should only show an error immediately if they have not selected another store.

I’m also proposing the same change to iOS to bring the two behaviours into alignment.

Figma Link: w3JBReW1UJesCf02sj43kR-fi-2576_28710

We should also improve the address formatting by:

• Truncating non-selected store addresses
• Showing the full address for selected stores, but line-breaking on [-], [ / ] or [.] characters instead of halfway through words.

And make the header section consistent across platforms.

I’ve made the following video walking through my proposal.

https://github.com/user-attachments/assets/5bfd5a48-456e-460d-9156-40138bc92b6c

[dangermattic]

Thanks for reporting! 👍