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/Tricep Press/frames/frame-1.svg

@@ -1,17 +1,37 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 180" fill="none">
   <title>Tricep Press</title>
+  <defs>
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+  </defs>
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+    <path d="M 98.5 68.4 L 128.0 63.0" stroke="#86cfc5" stroke-width="5" stroke-linecap="round"/>
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+  <g id="leg_r">
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+    <path d="M 156.0 151.8 L 166.9 153.5" stroke="url(#grad-leg_r-2)" stroke-width="5.9697" stroke-linecap="round"/>
+  </g>
+  <g id="arm_r">
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+    <path d="M 94.7 71.1 L 124.0 64.9" stroke="#0d9488" stroke-width="6" stroke-linecap="round"/>
+  </g>
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Exercise Library/Tricep Press/frames/frame-2.svg

@@ -1,17 +1,39 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 180" fill="none">
   <title>Tricep Press</title>
+  <defs>
+    <linearGradient id="grad-leg_l-0" gradientUnits="userSpaceOnUse" x1="123.9" y1="124.8" x2="168.0" y2="111.8"><stop offset="0" stop-color="#a9afba"/><stop offset="1" stop-color="#979da8"/></linearGradient>
+    <linearGradient id="grad-leg_l-1" gradientUnits="userSpaceOnUse" x1="168.0" y1="111.8" x2="160.0" y2="150.4"><stop offset="0" stop-color="#979da8"/><stop offset="1" stop-color="#a9afba"/></linearGradient>
+    <linearGradient id="grad-arm_l-0" gradientUnits="userSpaceOnUse" x1="110.6" y1="41.4" x2="113.2" y2="70.8"><stop offset="0" stop-color="#80ccc2"/><stop offset="1" stop-color="#86cfc5"/></linearGradient>
+    <linearGradient id="grad-leg_r-1" gradientUnits="userSpaceOnUse" x1="162.3" y1="112.9" x2="156.0" y2="151.8"><stop offset="0" stop-color="#3a3f4b"/><stop offset="1" stop-color="#3b404c"/></linearGradient>
+    <linearGradient id="grad-leg_r-2" gradientUnits="userSpaceOnUse" x1="156.0" y1="151.8" x2="166.9" y2="153.5"><stop offset="0" stop-color="#3b404c"/><stop offset="1" stop-color="#3f4450"/></linearGradient>
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+  </defs>
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+  <g id="leg_l">
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+    <path d="M 160.0 150.4 L 170.8 152.6" stroke="#a9afba" stroke-width="5" stroke-linecap="round"/>
+  </g>
+  <g id="arm_l">
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+    <path d="M 113.2 70.8 L 128.0 96.5" stroke="#86cfc5" stroke-width="5" stroke-linecap="round"/>
+  </g>
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