refactor(ui): drop redundant page headers, rework measure profile UX

Removes decorative route-label h1s across fitness, recipe and cospend
pages — replaced with sr-only h1s for assistive tech and a shared
.sr-only utility in app.css. On the measure page, the tucked-away
profile chip becomes a dismissible setup banner that only appears
when sex/height/birth year are missing, with a permanent "Edit profile"
link at the foot of the page.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.38.2",
+	"version": "1.39.0",
 	"private": true,
 	"type": "module",
 	"scripts": {