[MtlPhil]

Updates the Bolus section of the Apple Watch page for loopandlearn/LoopFollow#792, as asked in its review. It's meant to go into #73.

What changed on the watch

• The bolus screen opens on the amount instead of a list.
• The amount starts at the Loop / Trio recommendation when it's under 5 minutes old. Until the amount is changed by hand, a lower recommendation replaces it and a higher one is offered with a tap.
• At Continue, the Old Calculation Warning shows from 5 minutes, and from 12 minutes the amount is cleared.
• Quick-Pick boluses, and the recommendation from 5 to 12 minutes old, moved to a Presets button.
• The confirmation shows "Recommended" with the age, and stops with "Recommendation Lowered" if a newer cycle lowered it.

Still to do before this is ready

• New watch-bolus.png: the amount screen with a recommendation, Continue and Presets. The current one shows the old list.
• New watch-meal.png: the current one shows the Time button on the left and Log off the screen, which #792 fixes.