feat: refactor play area into sidebar layout with buttplug, recordings, and leaderboard sub-pages

- Add /play sidebar layout (mobile nav + desktop sidebar) with SexyBackground
- Move buttplug device control to /play/buttplug with Empty component and scan button
- Move recordings from /me/recordings to /play/recordings
- Move leaderboard to /play/leaderboard; redirect /leaderboard → /play/leaderboard
- Redirect /me/recordings → /play/recordings and /play → /play/buttplug
- Remove recordings entry from /me sidebar nav
- Rename "SexyPlay" → "Play", swap bluetooth icon for rocket, remove subtitle
- Add play.nav i18n keys (play, recordings, leaderboard, back_to_site, back_mobile)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/frontend/src/routes/me/+layout.svelte

@@ -10,11 +10,6 @@
   const navLinks = $derived([
     { name: $_("me.nav.profile"), href: "/me/profile", icon: "icon-[ri--user-line]" },
     { name: $_("me.nav.security"), href: "/me/security", icon: "icon-[ri--shield-keyhole-line]" },
-    {
-      name: $_("me.nav.recordings"),
-      href: "/me/recordings",
-      icon: "icon-[ri--play-list-2-line]",
-    },
     ...(data.isModel
       ? [
           {