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 Row/frames/frame-2.svg

@@ -1,16 +1,39 @@
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   <title>Dumbbell Row</title>
-  <path d="M 42.3 160.1 L 223.3 160.1 L 223.3 149.7 L 42.3 149.7 Z" fill="none" stroke="#b9bec9" stroke-width="3" stroke-linejoin="round"/>
+  <defs>
+    <linearGradient id="grad-leg_r-0" gradientUnits="userSpaceOnUse" x1="173.9" y1="82.8" x2="211.1" y2="109.4"><stop offset="0" stop-color="#9ca2ad"/><stop offset="1" stop-color="#a9afba"/></linearGradient>
+    <linearGradient id="grad-leg_r-1" gradientUnits="userSpaceOnUse" x1="211.1" y1="109.4" x2="241.6" y2="83.9"><stop offset="0" stop-color="#a9afba"/><stop offset="1" stop-color="#9fa5b0"/></linearGradient>
+    <linearGradient id="grad-leg_r-2" gradientUnits="userSpaceOnUse" x1="241.6" y1="83.9" x2="247.2" y2="93.2"><stop offset="0" stop-color="#9fa5b0"/><stop offset="1" stop-color="#a9afba"/></linearGradient>
+    <linearGradient id="grad-leg_l-0" gradientUnits="userSpaceOnUse" x1="168.0" y1="83.2" x2="162.4" y2="128.2"><stop offset="0" stop-color="#3a3f4b"/><stop offset="1" stop-color="#4e535f"/></linearGradient>
+    <linearGradient id="grad-leg_l-1" gradientUnits="userSpaceOnUse" x1="162.4" y1="128.2" x2="202.0" y2="122.6"><stop offset="0" stop-color="#4e535f"/><stop offset="1" stop-color="#414652"/></linearGradient>
+    <linearGradient id="grad-leg_l-2" gradientUnits="userSpaceOnUse" x1="202.0" y1="122.6" x2="211.3" y2="128.3"><stop offset="0" stop-color="#414652"/><stop offset="1" stop-color="#4e535f"/></linearGradient>
+    <linearGradient id="grad-arm_l-1" gradientUnits="userSpaceOnUse" x1="85.5" y1="98.9" x2="66.0" y2="121.3"><stop offset="0" stop-color="#3a3f4b"/><stop offset="1" stop-color="#4c515d"/></linearGradient>
+  </defs>
+  <path d="M 42.3 160.1 L 259.2 160.1 L 259.2 149.7 L 42.3 149.7 Z" fill="none" stroke="#b9bec9" stroke-width="3" stroke-linejoin="round"/>
   <path d="M 100.0 124.0 L 215.0 124.0 L 215.0 124.0 L 100.0 124.0 Z" fill="#c5cad4" stroke="#c5cad4" stroke-width="9" stroke-linecap="round" stroke-linejoin="round"/>
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   <path d="M 196.0 129.0 L 196.0 150.0" stroke="#c5cad4" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"/>
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-  <path id="arm_r" d="M 90.2 67.5 L 119.6 61.7 L 100.0 84.1" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="leg_l" d="M 168.0 83.2 L 162.4 128.2 L 202.0 122.6 L 211.3 128.3" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <g id="arm_r">
+    <path d="M 90.2 67.5 L 119.6 61.7" stroke="#86cfc5" stroke-width="5" stroke-linecap="round"/>
+    <path d="M 119.6 61.7 L 100.0 84.1" stroke="#86cfc5" stroke-width="5" stroke-linecap="round"/>
+  </g>
+  <g id="leg_r">
+    <path d="M 173.9 82.8 L 211.1 109.4" stroke="url(#grad-leg_r-0)" stroke-width="5.05663" stroke-linecap="round"/>
+    <path d="M 211.1 109.4 L 241.6 83.9" stroke="url(#grad-leg_r-1)" stroke-width="5.04492" stroke-linecap="round"/>
+    <path d="M 241.6 83.9 L 247.2 93.2" stroke="url(#grad-leg_r-2)" stroke-width="5.04492" stroke-linecap="round"/>
+  </g>
+  <g id="leg_l">
+    <path d="M 168.0 83.2 L 162.4 128.2" stroke="url(#grad-leg_l-0)" stroke-width="5.91075" stroke-linecap="round"/>
+    <path d="M 162.4 128.2 L 202.0 122.6" stroke="url(#grad-leg_l-1)" stroke-width="5.88088" stroke-linecap="round"/>
+    <path d="M 202.0 122.6 L 211.3 128.3" stroke="url(#grad-leg_l-2)" stroke-width="5.87931" stroke-linecap="round"/>
+  </g>
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   <path id="spine" d="M 168.0 82.0 Q 125.2 74.6 84.3 67.5" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_l" d="M 84.3 69.4 L 85.5 98.9 L 66.0 121.3" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <g id="arm_l">
+    <path d="M 84.3 69.4 L 85.5 98.9" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round"/>
+    <path d="M 85.5 98.9 L 66.0 121.3" stroke="url(#grad-arm_l-1)" stroke-width="5.91849" stroke-linecap="round"/>
+  </g>
   <path d="M 105.3 88.7 L 94.7 79.4" stroke="#6b7180" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/>
   <circle cx="105.3" cy="88.7" r="4.5" fill="#6b7180"/>
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