## Description
Updated the email content based on whether the document owner is a
recipient or not.
If the document owner is a recipient (self-signer):
* the email subject will be `Please view/sign/approve your document`
* the email header will be `Please view/sign/approve your document
"<your-doc-title>"`
* the email content will be `You have initiated the document
"<your-doc-title>" that requires you to view/sign/approve it.`
Otherwise:
* the email subject will be `Please view/sign/approve this document`
* the email header will be `<doc-owner> has invited you to
view/sign/approve "<doc-title>"`
* the email content will be `<doc-owner> has invited you to
view/sign/approve the document "<doc-title>".`
## Related Issue
Related to #1091
## Testing Performed
Tested the feature with a different number of recipients (including and
excluding the document owner - self-signer). Tested both the sending and
resending functionality.
## Checklist
- [x] I have tested these changes locally and they work as expected.
- [ ] I have added/updated tests that prove the effectiveness of these
changes.
- [ ] I have updated the documentation to reflect these changes, if
applicable.
- [x] I have followed the project's coding style guidelines.
- [ ] I have addressed the code review feedback from the previous
submission, if applicable.
## UI Screenshots
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
## Summary by CodeRabbit
- **New Features**
- Enhanced the document invitation components to support scenarios where
the recipient is also the sender, providing customized email content and
subject lines.
- Introduced new properties in email templates to improve clarity and
relevance based on the user's role in the document signing process.
- **Refactor**
- Updated components to use a more flexible `headerContent` property for
displaying invitation headers, replacing previous individual inviter
details.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
