fix(fitness): measure page polish — stable steppers, narrow history, body-parts chrome tweaks

- Lock +/- button positions by normalizing stepped weight/body-fat
  values to .toFixed(1) so trailing zeros stay; placeholders also
  normalized. Input width no longer jitters through a step sequence.
- Cap .history-section width on mobile/tablet to match .main-col
  (480px / 760px) so "Past measurements" aligns with the metric cards.
- Body-parts page:
  - Remove the "Running totals" list from the right panel.
  - Hide the keyboard-shortcut legend by default; show on `?` (toggle)
    or Escape (dismiss), with a small `?` pill hint in its place.
    Added kbd_hint i18n string.
  - Push skip + back/next toward the edges of the bottombar; pull
    progress dots + close button inward symmetrically.
  - Center the keyboard legend / hint on the screen width rather than
    between the skip and nav buttons (position: absolute + translate).

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.46.0",
+	"version": "1.46.1",
 	"private": true,
 	"type": "module",
 	"scripts": {