fix(fitness): read .value off rendered pending point in body-parts chart legend

The raw series has `pending: number | null`, but the rendered series stores
pending as `{ x, y, value }` for SVG placement. Legend labels were calling
`.toFixed(1)` directly on the object, crashing as soon as a pending value
existed (i.e. whenever the user typed a measurement).

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.36.2",
+	"version": "1.36.3",
 	"private": true,
 	"type": "module",
 	"scripts": {