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/Rotary/frames/frame-1.svg

@@ -1,5 +1,11 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 180" fill="none">
   <title>Rotary</title>
+  <defs>
+    <linearGradient id="grad-arm_l-1" gradientUnits="userSpaceOnUse" x1="188.7" y1="50.1" x2="211.3" y2="58.5"><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="122.0" x2="179.7" y2="135.7"><stop offset="0" stop-color="#a9afba"/><stop offset="1" stop-color="#3a3f4b"/></linearGradient>
+    <linearGradient id="grad-leg_r-0" gradientUnits="userSpaceOnUse" x1="153.0" y1="122.0" x2="140.3" y2="135.7"><stop offset="0" stop-color="#a9afba"/><stop offset="1" stop-color="#3a3f4b"/></linearGradient>
+    <linearGradient id="grad-arm_r-0" gradientUnits="userSpaceOnUse" x1="152.9" y1="39.8" x2="174.5" y2="53.0"><stop offset="0" stop-color="#a9afba"/><stop offset="1" stop-color="#3a3f4b"/></linearGradient>
+  </defs>
   <path d="M 130.0 144.5 L 130.0 166.5 L 190.0 166.5 L 190.0 144.5 Z" fill="none" stroke="#b9bec9" stroke-width="3" stroke-linejoin="round"/>
   <path d="M 138.0 130.0 L 182.0 130.0 L 182.0 130.0 L 138.0 130.0 Z" fill="#c5cad4" stroke="#c5cad4" stroke-width="8" stroke-linecap="round" stroke-linejoin="round"/>
   <path d="M 160.0 132.0 L 160.0 150.0" stroke="#c5cad4" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
@@ -7,10 +13,24 @@
   <path id="girdle" d="M 167.1 36.8 L 160.0 38.3 L 152.9 39.8" stroke="#0d9488" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="pelvisBar" d="M 167.0 122.0 L 160.0 122.0 L 153.0 122.0" stroke="#0d9488" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="spine" d="M 160.0 122.0 Q 160.0 79.2 160.0 38.3" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_l" d="M 167.1 36.8 L 188.7 50.1 L 211.3 58.5" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="leg_l" d="M 167.0 122.0 L 179.7 135.7 L 183.5 175.5 L 186.3 175.0" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="leg_r" d="M 153.0 122.0 L 140.3 135.7 L 136.5 175.5 L 133.7 175.0" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_r" d="M 152.9 39.8 L 174.5 53.0 L 197.2 61.4" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <g id="arm_l">
+    <path d="M 167.1 36.8 L 188.7 50.1" stroke="#a9afba" stroke-width="5" stroke-linecap="round"/>
+    <path d="M 188.7 50.1 L 211.3 58.5" stroke="url(#grad-arm_l-1)" stroke-width="5.5" stroke-linecap="round"/>
+  </g>
+  <g id="leg_l">
+    <path d="M 167.0 122.0 L 179.7 135.7" stroke="url(#grad-leg_l-0)" stroke-width="5.5" stroke-linecap="round"/>
+    <path d="M 179.7 135.7 L 183.5 175.5" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round"/>
+    <path d="M 183.5 175.5 L 186.3 175.0" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round"/>
+  </g>
+  <g id="leg_r">
+    <path d="M 153.0 122.0 L 140.3 135.7" stroke="url(#grad-leg_r-0)" stroke-width="5.5" stroke-linecap="round"/>
+    <path d="M 140.3 135.7 L 136.5 175.5" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round"/>
+    <path d="M 136.5 175.5 L 133.7 175.0" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round"/>
+  </g>
+  <g id="arm_r">
+    <path d="M 152.9 39.8 L 174.5 53.0" stroke="url(#grad-arm_r-0)" stroke-width="5.5" stroke-linecap="round"/>
+    <path d="M 174.5 53.0 L 197.2 61.4" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round"/>
+  </g>
   <path d="M 204.2 74.0 L 204.2 46.0" stroke="#6b7180" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"/>
   <circle id="head" cx="160.0" cy="18.6" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>
   <line id="nose" x1="169.6" y1="21.3" x2="173.3" y2="22.3" stroke="#3a3f4b" stroke-width="4" stroke-linecap="round"/>