### Summary
This PR improves the verify email dialog by giving the verify-email and
change-email flows distinct messaging instead of reusing the same
generic copy.
### What changed
* Use flow-specific body copy in the verify email dialog
* Keep the existing action-specific subtitle behavior for:
* Verify email
* Change email
* Update the English i18n strings so each flow explains the correct
intent:
* Verify email focuses on confirming email ownership
* Change email focuses on securely starting the email-change process
### Why
The previous dialog message was shared across both flows, which made the
change-email experience feel ambiguous. This update makes the intent
clearer for users and better matches the action they are taking.
https://www.loom.com/share/c64c20570a8242358bd178a2ac50e413
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Improved clarity in email verification and email change dialog
messages to better explain the confirmation process and link purpose.
* Enhanced distinction between email verification and email change
workflows with context-specific messaging.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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