feat(header): add smart sticky scroll animation and styling refinements

- Implement RAF-throttled smart sticky scroll interaction on app header
- Add flow-root BFC isolation, vertical margin, and mobile menu scroll container
- Update brand logo kicker hover color to primary accent (cobalt-dark)
- Fix theme script hydration warning with suppressHydrationWarning
- Add favicon.ico and icon.svg to resolve root /favicon.ico 404
- Add MAM orchestration guidelines, env generation script, and templates

refer_landing_page/app/icon.svg

@@ -0,0 +1,17 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32" width="32" height="32">
+  <defs>
+    <linearGradient id="cobaltGrad" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" stop-color="#4E77FF"/>
+      <stop offset="100%" stop-color="#2B4CDE"/>
+    </linearGradient>
+  </defs>
+  <rect width="32" height="32" rx="7" fill="url(#cobaltGrad)"/>
+  <!-- Network Agent Nodes & Graph -->
+  <circle cx="16" cy="9" r="2.5" fill="#FFFFFF"/>
+  <circle cx="9" cy="22" r="2.5" fill="#FFFFFF"/>
+  <circle cx="23" cy="22" r="2.5" fill="#FFFFFF"/>
+  <circle cx="16" cy="17" r="2" fill="#FFD666"/>
+  
+  <path d="M16 9 L9 22 M16 9 L23 22 M9 22 L23 22 M16 9 L16 17 M9 22 L16 17 M23 22 L16 17" 
+        stroke="#FFFFFF" stroke-width="1.2" stroke-opacity="0.8" stroke-linecap="round"/>
+</svg>