fix: apply UI tier to standalone dashboard pages (ADS-B, AIS, Satellite)

Each dashboard is a separate HTML page that doesn't inherit the main SPA's
localStorage restore. Add a synchronous tier-restore script before CSS loads
so html[data-ui-tier] selectors fire on first paint.

Also add enhanced/lean tier override blocks to each dashboard CSS to remap
the dashboard-local variables (--bg-dark, --bg-panel, --radar-cyan, etc.)
that variables.css doesn't cover, and add lean-mode scanline/bg hide rules
since components.css is not loaded on these pages.

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

templates/adsb_dashboard.html

@@ -4,6 +4,7 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>AIRCRAFT RADAR // INTERCEPT - See the Invisible</title>
+    <script>(function(){var t=localStorage.getItem('intercept-ui-tier')||'enhanced';document.documentElement.setAttribute('data-ui-tier',t);})();</script>
     <!-- Dedicated dashboards always use bundled assets so navigation is not
          blocked by external CDN reachability. -->
     <link rel="stylesheet" href="{{ url_for('static', filename='css/fonts-local.css') }}">