feat: show inscription service fee fiat amount

[teebszet]

🔘 PR Type

• Bugfix
• Enhancement
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no API changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

📜 Background

We show the fiat amount for all line items in the BRC-20 transfer confirmation screen but not the inscription service fee.

Issue Link: #[issue_number]
Context Link (if applicable):

🔄 Changes

changes:

• show the inscription service fee amount converted to fiat rate

Impact:

• only a UI change on confirm brc20 send screen

🖼 Screenshot / 📹 Video

✅ Review checklist

Please ensure the following are true before merging:

• Code Style is consistent with the project guidelines.
• Code is readable and well-commented.
• No unnecessary or debugging code has been added.
• Security considerations have been taken into account.
• The change has been manually tested and works as expected.
• Breaking changes and their impacts have been considered and documented.
• Code does not introduce new technical debt or issues.

[linear]

ENG-2332 Show fiat amount for inscription service fee

We show the fiat amount for all line items in the BRC-20 transfer confirmation screen but not the inscription service fee.

image.png

[github-actions]

Test with build here: https://github.com/secretkeylabs/xverse-web-extension/actions/runs/5678377931

[yknl]

tested