Allow hosts to brand the Tasks App

Right now, when we invite a cleaner, they receive:

• an invite email branded as Hospitable, not our company

• reminder emails also branded as Hospitable

• portal access via tasks.hospitable.com, not our own domain

This is a genuine drawback for us. We don't want to reveal to occasional/freelance cleaners which PMS stack we run behind the scenes, and a fully branded experience simply looks more professional to the people we work with day to day.

What makes this feel like a solvable gap rather than a big ask: you've already built exactly this for the Owner's Portal (Settings > Brands — custom logo, brand name, primary color, and a connected custom domain instead of owners.hospitable.com). The infrastructure clearly exists. It would make a real difference if the same branding/custom-domain system were extended to the Tasks/Teammate Portal — invite emails, reminder emails, and the portal URL itself.

Given how central the Tasks app now is to daily operations, this seems like a natural next step rather than a nice-to-have.