Mobile App: Class & Appointment Photos + Fixes (v1.8.6)

The latest mobile app update brings photo galleries to classes and appointments, along with a batch of stability fixes.

• Photos for classes & appointments — Each class and appointment type can now show a gallery of photos on its detail screen; swipe through them and tap any image to view it full-screen. The browse lists have also been redesigned into cleaner, more compact cards.
• PDF documents on Android — Documents now open reliably; fixed a blank screen and crash when viewing PDFs on Android.
• Stays signed in during outages — A brief server outage no longer signs you out. The app shows a "reconnecting" overlay and recovers automatically once the connection is back.
• General bug fixes and performance improvements.