Add Warm-Up and Stretching activity types

Adds WorkoutActivityType.warmUp (HealthKit .preparationAndRecovery) and
.stretching (.flexibility), and retags the six starter splits that were all
mislabeled as Functional Strength:

- Warm-Up:    Upper Body Warm-Up, Lower Body Warm-Up, Morning Wake-Up
- Stretching: Morning Mobility, Full Body Stretch, Evening Stretch

The split editor's activity picker surfaces them automatically (CaseIterable).
Older app versions decode the new raw values as the default type — additive and
not schema-gated, so no quarantine.

Exercise Library/Dumbbell Bench Press/frames/frame-1.svg

@@ -1,16 +1,36 @@
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   <title>Dumbbell Bench Press</title>
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Exercise Library/Dumbbell Bench Press/frames/frame-2.svg

@@ -1,22 +1,44 @@
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   <title>Dumbbell Bench Press</title>
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