feat(fitness): add guided body-parts measurement wizard

New /fitness/measure/body-parts route with step-by-step tape-measure
flow, per-step tips, L/R paired inputs, inline history chart, and
review-before-save summary. Measure page replaces the old body-parts
accordion with a launch button. Fitness layout goes full-bleed and
hides the site footer for this route via a :has() attribute selector,
and the desktop 3-column grid now extends rail and side panel up past
the floating nav while the middle column compensates with padding.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.35.3",
+	"version": "1.36.0",
 	"private": true,
 	"type": "module",
 	"scripts": {