chore(oauth): improve the look of the OAuth confirmation page

This MR tweaks the OAuth confirmation screen

before	after

How to test

• clone CLI
• in the CLI project apply the following diff (replace your path to client-go)

diff --git i/go.mod w/go.mod
index d7f2519d..df92c418 100644
--- i/go.mod
+++ w/go.mod
@@ -8,6 +8,9 @@ go 1.25.4
 // https://github.com/timofurrer/huhtest/commit/46976a734937473c024ca7e50beee3c7a43fb528
 replace github.com/survivorbat/huhtest => github.com/timofurrer/huhtest v0.0.0-20250922072747-46976a734937
 
+// Use local client-go for development
+replace gitlab.com/gitlab-org/api/client-go => /Users/tomas/workspace/gl/client-go
+
 require (
 	github.com/MakeNowJust/heredoc/v2 v2.0.1
 	github.com/acarl005/stripansi v0.0.0-20180116102854-5a71ef0e047d

and then

go mod tidy
make install
glab auth login

and select the web option