Helpful error messages, deeplinks, and so much pretty

• Know when you don't have a browser installed and see a handy button to find one from the Play Store.
• Tap a Plane link from other apps to open them in this app and vice-versa.
• Only Started and Unstarted issues show up in the Active tab on the list of issues. Cleaner.
• Also cleaner are some props' values on Issue Details.