Add explanation when configs are merged/migrated/...

[TheAlexLichter]

Description

Would recommend some in-terminal explanations of why merging/keeping some of the different configs is being offered as an option, but that's also small details.

Suggested solution

Add info where possible (e.g. why it is prompted to skip or merge .vscode files, same for agents etc.)

Alternative

No response

Additional context

https://x.com/sachasayan/status/2034302785777193428?s=20

Validations

• Read the Contributing Guidelines.
• Confirm this request is for Vite+ itself and not for Vite, Vitest, tsdown, Rolldown, or Oxc.
• Check that there isn't already an issue requesting the same feature.