"Open bitcoin URI" dialog could give more feedback on what's wrong with BIP21 URI

[kristapsk]

Please describe the feature you'd like to see added.

Currently, when trying to open URI, if it's invalid, clicking "OK" will just colour it red, instead of giving any feedback, what's exactly wrong with URI.

In my test I added unknown required paramter req-test=1. Feedback on that would be useful for user, for example, BIP77 Payjoin v2 draft adds req-pj parameter, where receiver specifies that it require sender to do payjoin instead of simple send, but Bitcoin Core GUI doesn't know how to handle payjoins currently.

Is your feature related to a problem, if so please describe it.

No response

Describe the solution you'd like

No response

Describe any alternatives you've considered

No response

Please leave any additional context

No response