games: brighter marquee bulbs, a chase that loops, and no more subtitle

The Casino Night light strip was a dim blurred stripe that jumped every
cycle (it slid further than the bulb pattern repeats). Now it's a row of
round bulbs with a white-hot core and a real glow, and the chase travels
exactly one bulb-period so it loops seamlessly. Dropped the 'Chips are
euros' line under the room name; the welcome card and house rules already
say it.

Claude-Session: https://claude.ai/code/session_013M5nD7PgUboJXoDcYHzpuJ

internal/web/templates/games_layout.html

@@ -68,7 +68,6 @@
         {{template "_comb" .}}
         <span class="min-w-0">
           <span data-room-name class="block font-display text-2xl sm:text-3xl font-bold leading-none tracking-tight">{{.Room.Name}}</span>
-          <span class="mt-1 block text-xs font-semibold uppercase tracking-[0.18em] text-[color:var(--ink)]/45">Chips are euros</span>
         </span>
       </a>