Become a member: photo-only carousel + drop unconfirmed figures note

- Remove the coloured placeholder cards behind the "ways to be part of
  MSOS" carousel (override the _hub.css gradients on .mm-use) and load the
  photos eagerly with fetchpriority so they appear immediately.
- Remove the "Figures to confirm before launch." note (and the SI
  equivalent) from the MSOS-in-numbers section.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

css/pages/_member.css

@@ -84,6 +84,11 @@
    These rules only tweak card size and add a small icon badge over the photo. */
 .mm-ways-carousel { margin-top: 4px; }
 .mm-use { width: clamp(240px, 24vw, 300px); aspect-ratio: 5 / 6; }
+/* Photos only — drop the coloured placeholder cards inherited from _hub.css.
+   Two classes beat _hub.css's later-loaded .hub-use:nth-child() rules. */
+.mm-use.hub-use,
+.mm-use.hub-use:nth-child(3n+2),
+.mm-use.hub-use:nth-child(3n+3) { background: none; }
 /* Brand icon as a subtle glass badge floating over the photo. */
 .mm-use-ico {
     position: absolute; top: 14px; left: 14px; z-index: 3;