fix: wallet already exists error page styles

[patricio0312rev]

[Errors] Wallet already exists page needs work

Summary

• Styles for HTML inserted in error pages have been updated to prevent text being displayed horizontally.

Checklist

• I checked that both pnpm dev and pnpm dev:bare work as intended
• I checked the basic extension interactions and made sure wallet selection works
• I checked my UI changes against the design and there are no notable differences, including responsiveness
• I checked my (code) changes for obvious issues, debug statements and commented code
• I opened a corresponding card on Clickup for any remaining TODOs in my code
• I added a short description on how to test this PR (if necessary)
• Ready to be merged