Still Dark — what shipped

Build 18

• Mac: Two-finger swipe now works everywhere, including while you're writing — swipe to put a prayer away into the archive, swipe the other way for a new one.
• iPhone: Pressing Return no longer jumps the page away from what you were writing — the line you're on stays put.
• A gentle first-time hint now shows how to finish a prayer, then never again.
• Small wording fixes.