fix: rebalance mascot SVG for proper visual centering

- Redrawn SVG with symmetrical layout around center axis
- Use display:block + margin:auto on img for guaranteed centering
- Regenerated PNG and ICO from corrected source

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: fernandomenuk

crates/wmux-app/icons/icon.ico

@@ -445,7 +445,7 @@
   <!-- Hero -->
   <section id="hero">
     <div class="container hero">
-      <img src="logo.png" alt="wmux mascot" width="120" height="120" style="margin-bottom: 1.5rem; filter: drop-shadow(0 0 30px rgba(167, 139, 250, 0.3));">
+      <img src="logo.png" alt="wmux mascot" width="120" height="120" style="display: block; margin: 0 auto 1.5rem; filter: drop-shadow(0 0 30px rgba(167, 139, 250, 0.3));">
       <div class="hero-badge"><span>v0.6.0</span> Native Desktop App</div>
       <h1>cmux for Windows.</h1>
       <p class="hero-subtitle">Split panes. Tabbed workspaces. A socket API for AI agents. A high-performance desktop app built with Rust and Tauri.</p>