feat(layout): add logo image and favicon styling

src/layouts/BaseLayout.astro

@@ -22,6 +22,9 @@ const { title, description = "AI-Native code editor built with Rust and Tauri. F
     <meta property="og:type" content="website" />
     <meta property="og:url" content="https://zblade.dev" />
     
+    <!-- Favicon -->
+    <link rel="icon" type="image/png" href="/zblade-logo.png" />
+    
     <!-- Fonts -->
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
@@ -51,8 +54,7 @@ const { title, description = "AI-Native code editor built with Rust and Tauri. F
       <div class="container">
         <div class="header-content">
           <a href="/" class="logo">
-            <span class="logo-line-1">ZAGUÁN</span>
-            <span class="logo-line-2">BLADE</span>
+            <img src="/zblade-logo.png" alt="Zaguán Blade" class="logo-image" />
           </a>
           <nav class="nav">
             <a href="/#features">Features</a>