Add shelves page to game library; refresh bggpipe export

Port the export's physical shelf layout (.wall/.orow/.ocell) into the
scoped embed.css so /mygames/?g=shelves renders the wall in true
proportions, using the cream board color and accent-purple links for
legibility on the dark theme. Includes a fresh bggpipe re-export (new
Etherfields and Red Dragon Inn titles, updated art). embed.js/embed.css
are untouched by the export.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

static/games/tang-garden/index.html

@@ -36,7 +36,7 @@ During the game, by placing tiles on special parts of the board, you will be abl
 
 At the end of the game, the player with the most prestige will be the winner.
 
-—description from the publisher</div>
+—description from the publisher</div><div class="card"><div class="factrow"><b>where it lives</b> Library Kallax · C4</div></div>
 <footer>
   <p><a class="pbb" href="https://boardgamegeek.com" rel="noopener"><img src="../art/powered-by-bgg.png" alt="Powered by BGG" height="40"></a></p>
   <p>The Game Shelves · cataloged from shelf photos by