A small round of cleanups across the landing page and guest mode:
- The "Download on the App Store" badge in the landing footer now opens the App Store directly. It used to hang on a loader on phones and bounce back to landing on desktop.
- Tapping "Log in" shows a sign-in dialog. Tapping "Join Roomie" shows a sign-up dialog. They were the same screen before.
- On mobile, the empty goals area no longer peeks out when you have no focus area yet.
- Liking grouped sessions, blocking, reporting, and merging focus areas as a guest now open a friendly sign-up prompt instead of doing nothing.