feat: add notes to domain detail view

[kevwilliams]

Summary

• Adds a Notes section to the domain detail page, allowing staff to attach freeform notes to any domain
• Resolves note creator IDs to email addresses server-side via the IAM API so the UI displays "Added by user@example.com" instead of a numeric user ID
• Tightens the notes list layout — removes nested Card wrappers in favour of a divider-separated list with inline author/timestamp metadata

Test plan

• Navigate to a project domain detail page and verify the Notes section appears
• Add a note and confirm it appears immediately with the correct author email and timestamp
• Delete a note and confirm it is removed
• Verify that notes created by multiple users show distinct emails
• Verify graceful fallback (user ID shown) if the IAM lookup fails for a creator

Screencast.From.2026-02-27.16-15-59.mp4

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