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/Adductor/frames/frame-2.svg

@@ -1,5 +1,11 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 180" fill="none">
   <title>Adductor</title>
+  <defs>
+    <linearGradient id="grad-arm_l-1" gradientUnits="userSpaceOnUse" x1="180.3" y1="60.8" x2="188.7" y2="86.7"><stop offset="0" stop-color="#a9afba"/><stop offset="1" stop-color="#3a3f4b"/></linearGradient>
+    <linearGradient id="grad-arm_r-1" gradientUnits="userSpaceOnUse" x1="139.7" y1="60.8" x2="131.3" y2="86.7"><stop offset="0" stop-color="#a9afba"/><stop offset="1" stop-color="#3a3f4b"/></linearGradient>
+    <linearGradient id="grad-leg_l-0" gradientUnits="userSpaceOnUse" x1="167.0" y1="116.0" x2="172.6" y2="133.1"><stop offset="0" stop-color="#86cfc5"/><stop offset="1" stop-color="#0d9488"/></linearGradient>
+    <linearGradient id="grad-leg_r-0" gradientUnits="userSpaceOnUse" x1="153.0" y1="116.0" x2="147.4" y2="133.1"><stop offset="0" stop-color="#86cfc5"/><stop offset="1" stop-color="#0d9488"/></linearGradient>
+  </defs>
   <path d="M 130.0 145.6 L 130.0 165.2 L 190.0 165.2 L 190.0 145.6 Z" fill="none" stroke="#b9bec9" stroke-width="3" stroke-linejoin="round"/>
   <path d="M 160.0 64.0 L 160.0 120.0 L 160.0 120.0 L 160.0 64.0 Z" fill="#c5cad4" stroke="#c5cad4" stroke-width="16" stroke-linecap="round" stroke-linejoin="round"/>
   <path d="M 135.0 131.0 L 185.0 131.0 L 185.0 131.0 L 135.0 131.0 Z" fill="#c5cad4" stroke="#c5cad4" stroke-width="10" stroke-linecap="round" stroke-linejoin="round"/>
@@ -7,10 +13,24 @@
   <path id="girdle" d="M 171.0 32.3 L 160.0 32.3 L 149.0 32.3" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="pelvisBar" d="M 167.0 116.0 L 160.0 116.0 L 153.0 116.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="spine" d="M 160.0 116.0 Q 160.0 73.2 160.0 32.3" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_l" d="M 171.0 32.3 L 180.3 60.8 L 188.7 86.7" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_r" d="M 149.0 32.3 L 139.7 60.8 L 131.3 86.7" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="leg_l" d="M 167.0 116.0 L 172.6 133.1 L 174.9 172.8 L 176.1 171.7" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="leg_r" d="M 153.0 116.0 L 147.4 133.1 L 145.1 172.8 L 143.9 171.7" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <g id="arm_l">
+    <path d="M 171.0 32.3 L 180.3 60.8" stroke="#a9afba" stroke-width="5" stroke-linecap="round"/>
+    <path d="M 180.3 60.8 L 188.7 86.7" stroke="url(#grad-arm_l-1)" stroke-width="5.5" stroke-linecap="round"/>
+  </g>
+  <g id="arm_r">
+    <path d="M 149.0 32.3 L 139.7 60.8" stroke="#a9afba" stroke-width="5" stroke-linecap="round"/>
+    <path d="M 139.7 60.8 L 131.3 86.7" stroke="url(#grad-arm_r-1)" stroke-width="5.5" stroke-linecap="round"/>
+  </g>
+  <g id="leg_l">
+    <path d="M 167.0 116.0 L 172.6 133.1" stroke="url(#grad-leg_l-0)" stroke-width="5.5" stroke-linecap="round"/>
+    <path d="M 172.6 133.1 L 174.9 172.8" stroke="#0d9488" stroke-width="6" stroke-linecap="round"/>
+    <path d="M 174.9 172.8 L 176.1 171.7" stroke="#0d9488" stroke-width="6" stroke-linecap="round"/>
+  </g>
+  <g id="leg_r">
+    <path d="M 153.0 116.0 L 147.4 133.1" stroke="url(#grad-leg_r-0)" stroke-width="5.5" stroke-linecap="round"/>
+    <path d="M 147.4 133.1 L 145.1 172.8" stroke="#0d9488" stroke-width="6" stroke-linecap="round"/>
+    <path d="M 145.1 172.8 L 143.9 171.7" stroke="#0d9488" stroke-width="6" stroke-linecap="round"/>
+  </g>
   <path d="M 147.4 146.1 L 147.4 120.1" stroke="#6b7180" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path d="M 172.6 146.1 L 172.6 120.1" stroke="#6b7180" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <circle id="head" cx="160.0" cy="12.6" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>