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/gloomhaven-buttons-bugs/index.html

@@ -26,7 +26,7 @@ Your character is one such wannabe hero. In an ill-advised attempt at fame, they
 
 Each scenario is a single card, pitting one mercenary against a handful of enemies with simplified actions and AI. Each mercenary has a hand of just four double-sided cards, but they can be used twice — both the front and the back — before they are discarded. Attacks are resolved using a die in conjunction with a modifier table, and both the table and the mercenary ability cards can be improved as you level up throughout the campaign.
 
-—description from the publisher</div>
+—description from the publisher</div><div class="card"><div class="factrow"><b>where it lives</b> Library Kallax · D3</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