- Introduce helper functions `_outlook_font` and `_outlook_link` for better formatting in Outlook-compatible HTML.
- Update `create_outlook_html` to utilize new font and link functions, improving the overall appearance of the newsletter.
- Modify CSS to add styles for a new copy dialog overlay and related components.
- Refactor JavaScript to improve copy functionality and add a dialog for copying HTML content.
- Update dashboard template to enhance user instructions for copying and downloading HTML content.
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