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/Incline Bench Press/frames/frame-2.svg

@@ -1,16 +1,38 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 180" fill="none">
   <title>Incline Bench Press</title>
+  <defs>
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+    <linearGradient id="grad-leg_l-1" gradientUnits="userSpaceOnUse" x1="192.1" y1="115.6" x2="195.7" y2="148.9"><stop offset="0" stop-color="#999faa"/><stop offset="1" stop-color="#a9afba"/></linearGradient>
+    <linearGradient id="grad-arm_l-1" gradientUnits="userSpaceOnUse" x1="117.1" y1="46.3" x2="110.7" y2="21.9"><stop offset="0" stop-color="#86cfc5"/><stop offset="1" stop-color="#7fccc2"/></linearGradient>
+    <linearGradient id="grad-leg_r-1" gradientUnits="userSpaceOnUse" x1="187.2" y1="116.2" x2="192.3" y2="149.3"><stop offset="0" stop-color="#3a3f4b"/><stop offset="1" stop-color="#3d424e"/></linearGradient>
+    <linearGradient id="grad-leg_r-2" gradientUnits="userSpaceOnUse" x1="192.3" y1="149.3" x2="201.4" y2="147.1"><stop offset="0" stop-color="#3d424e"/><stop offset="1" stop-color="#3a3f4b"/></linearGradient>
+    <linearGradient id="grad-arm_r-0" gradientUnits="userSpaceOnUse" x1="105.3" y1="72.1" x2="112.7" y2="48.0"><stop offset="0" stop-color="#13978b"/><stop offset="1" stop-color="#0d9488"/></linearGradient>
+  </defs>
   <path d="M 80.8 159.4 L 215.1 159.4 L 215.1 150.5 L 80.8 150.5 Z" fill="none" stroke="#b9bec9" stroke-width="2.55" stroke-linejoin="round"/>
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+  <g id="leg_l">
+    <path d="M 154.8 127.1 L 192.1 115.6" stroke="url(#grad-leg_l-0)" stroke-width="4.31136" stroke-linecap="round"/>
+    <path d="M 192.1 115.6 L 195.7 148.9" stroke="url(#grad-leg_l-1)" stroke-width="4.31136" stroke-linecap="round"/>
+    <path d="M 195.7 148.9 L 204.9 147.2" stroke="#a9afba" stroke-width="4.25" stroke-linecap="round"/>
+  </g>
+  <g id="arm_l">
+    <path d="M 110.3 70.5 L 117.1 46.3" stroke="#86cfc5" stroke-width="4.25" stroke-linecap="round"/>
+    <path d="M 117.1 46.3 L 110.7 21.9" stroke="url(#grad-arm_l-1)" stroke-width="4.27324" stroke-linecap="round"/>
+  </g>
   <path id="girdle" d="M 110.3 70.5 L 105.3 70.4 L 105.3 72.1" stroke="#3a3f4b" stroke-width="4.25" stroke-linecap="round" stroke-linejoin="round"/>
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+  <g id="leg_r">
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+    <path d="M 192.3 149.3 L 201.4 147.1" stroke="url(#grad-leg_r-2)" stroke-width="5.09008" stroke-linecap="round"/>
+  </g>
+  <g id="arm_r">
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+    <path d="M 112.7 48.0 L 107.3 23.5" stroke="#0d9488" stroke-width="5.1" stroke-linecap="round"/>
+  </g>
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