feat(a11y,admin): skip link, aria-labels, Ready label, title + age fixes

A11y:
- Skip-to-content link lands first in the body and jumps to #main
  past the header + sidebar for keyboard users.
- aria-label on the icon buttons that previously carried only an
  icon: hamburger menu (+ aria-controls="sidebar"), mobile search
  toggle, account menu (also drops the duplicate alt on the avatar
  since the button name already speaks the user's name).

Admin:
- Dashboard stat card renamed "Live Videos" → "Ready" (matches the
  DB status column; nothing on this card is actually live).

Settings:
- Duplicate "Prefer not to say" option on the Gender select — the
  empty placeholder shared the same label as the real option.
  Placeholder is now "Select…"; the real "Prefer not to say" option
  stays unchanged.
- Birthday picker caps the Year dropdown at (this year − 13) and
  the server-side register validation requires the same, so a
  client bypass can't let a <13 user through.

Titles:
- Admin layout uses "{Page} | TAKEONE" to match the frontend format
  (was "{Page} — TAKEONE"). User pages that said "| TAKEONE" literal
  now interpolate config('app.name'). Shorts and Welcome moved from
  " - " to " | " separator.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

resources/views/admin/dashboard.blade.php

@@ -292,13 +292,16 @@
 
     {{-- Ready Videos --}}
     <div class="col-6 col-lg-4 col-xl-2">
-        <div class="stat-card clickable-card" onclick="openDashModal('Live Videos','videos',{status:'ready'},'bi-check-circle-fill')" title="Click to view live videos">
+        <div class="stat-card clickable-card" onclick="openDashModal('Ready','videos',{status:'ready'},'bi-check-circle-fill')" title="Click to view ready videos">
             <div class="stat-card-accent" style="background: linear-gradient(90deg,#22c55e,#4ade80);"></div>
             <div class="stat-card-top">
                 <div class="stat-icon" style="background:rgba(34,197,94,.15);color:#4ade80;"><i class="bi bi-check-circle-fill"></i></div>
             </div>
             <div class="stat-value">{{ number_format($videosByStatus->get('ready', 0)) }}</div>
-            <div class="stat-label">Live Videos</div>
+            {{-- "Ready" matches the DB status column; "Live Videos" was misleading
+                 — nothing streams live from this card, it just counts videos that
+                 finished processing successfully. --}}
+            <div class="stat-label">Ready</div>
             @php $failPct = $stats['totalVideos'] > 0 ? round(($failedCount/$stats['totalVideos'])*100,1) : 0; @endphp
             <div class="stat-growth {{ $failPct > 5 ? 'down' : 'flat' }}">
                 <i class="bi bi-x-circle"></i> {{ $failedCount }} failed