Thank you for your PR!

• is there no way to keep the tailwind config back where it was, that was the more modern syntax. I believe u can still add typography plugin without changing the entire file to an older format. correct me if i am wrong!
• I like the idea of the email signature customization and what you added. i believe we can present it to design.
• I see that you used some shadcn components but really the ticket explicitly requires using our shared design system. Your UI elements are built from scratch, so I'd recommend to refactor the form inputs, buttons, tabs, etc to use our existing shared components. This will also make everything look more alike to the design.
• I'd say try to stick closer to design on figma with the font, colors, and looks. For example, some buttons in ur ticket have an underglow, or the formatting tools section looks really different.
• The email preview part was like a placeholder design by the designers whcih is why it's so blue. as designers build it out id say try to mimic the barebones design as we wont know fully what it'd look like in the future.

Thanks again for your work! DM if questions :)