feat: camel crush themed landing page (crush branch)

- New CrushBase.astro layout with teal/silver color palette
- Redesigned index.astro with Camel Crush pack-inspired branding:
  - Alfa Slab One font header (dangrubb.net)
  - Center circular DG monogram with teal gradient (like Joe Camel)
  - Animated splatter background effect
  - 'Hint of Menthol • More Menthol' tagline
  - Bottom nav links styled like pack text (ai•blog•media•storage•cv•git)

src/layouts/CrushBase.astro

@@ -0,0 +1,58 @@
+---
+const { title } = Astro.props;
+---
+
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>{title}</title>
+    <link rel="icon" href="/src/img/favicon.ico" type="image/x-icon" />
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Alfa+Slab+One&family=Barlow:wght@400;600;700&display=swap" rel="stylesheet">
+  </head>
+  <body>
+    <slot />
+  </body>
+</html>
+
+<style is:global>
+  * { box-sizing: border-box; margin: 0; padding: 0; }
+
+  /* Camel Crush Smooth Silver color palette */
+  :root {
+    --crush-teal: #008b8b;
+    --crush-teal-light: #20b2aa;
+    --crush-teal-dark: #006666;
+    --crush-silver: #c0c0c0;
+    --crush-white: #ffffff;
+    --crush-bg: #f8f9fa;
+    --crush-cream: #faf8f5;
+  }
+
+  body {
+    background: var(--crush-white);
+    font-family: 'Barlow', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
+    color: var(--crush-teal-dark);
+    min-height: 100vh;
+    margin: 0;
+    padding: 0;
+    overflow-x: hidden;
+  }
+
+  a {
+    color: var(--crush-teal);
+    text-decoration: none;
+    transition: all 0.3s ease;
+  }
+
+  a:hover {
+    color: var(--crush-teal-light);
+  }
+
+  a:visited {
+    color: var(--crush-teal);
+  }
+</style>