One Bottom Bar, and Mobile Layout Fixes

One bottom bar on mobile, on every page, plus a Customize page to configure what sits on it.
The home panel knows whether you are signed in, and the Roadmap panel is now The Road Ahead.
Background refreshes stop after five minutes idle, which is easier on mobile battery. An active fight always keeps updating.
The landing page got a polish pass.

The profile sheet had no close button and overflowed the viewport on mobile Chrome.
On mobile bottom sheets, the close button overflowed the grabber header into the body.
Full-height pages are measured against your real viewport, so pages stop scrolling past their own content on mobile browsers.
Tab strips stay contained instead of overflowing their surface.
The gender dropdown on character creation is readable. It used to be pale text on a white popup.