fix: make installer resilient to missing sound files, update pack count

- Sound file downloads now warn instead of aborting on 404 (fixes #72)
- Updated website pack count to 30
- Added missing packs to install.sh PACKS list

Closes #72
Closes #70

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

Author: garysheng

docs/index.html

@@ -1294,7 +1294,7 @@ <h2 class="section-title">Choose your character</h2>
   </div>
 
   <div class="contribute-cta">
-    <p><strong>28 packs and counting!</strong> You're only seeing a few above &mdash; there are many more including GLaDOS, StarCraft Terran units, Czech, Spanish &amp; Russian &amp; Polish Warcraft packs, and others.</p>
+    <p><strong>30 packs and counting!</strong> You're only seeing a few above &mdash; there are many more including GLaDOS, StarCraft Terran units, Czech, Spanish &amp; Russian &amp; Polish Warcraft packs, and others.</p>
     <p>Run <code>peon --packs</code> to see them all, or <a href="https://github.com/PeonPing/peon-ping#sound-packs">check the full list on GitHub</a>.</p>
     <p class="contribute-ideas"><strong>Want to add your own?</strong> Any game, any character &mdash; drop your sound files in <code>packs/&lt;name&gt;/sounds/</code>, add a manifest, and <a href="https://github.com/PeonPing/peon-ping/blob/main/CONTRIBUTING.md">open a PR</a>.</p>
   </div>