Add renewable energy favicon with sun and leaf

packages/web/app/layout.tsx

@@ -17,6 +17,7 @@ const geistMono = Geist_Mono({
 export const metadata: Metadata = {
   title: "REmodel — RE Project Finance",
   description: "Hybrid Solar + Wind + BESS project finance modeling",
+  icons: [{ rel: "icon", url: "/favicon.svg" }],
 };
 
 export default function RootLayout({

packages/web/public/favicon.svg

@@ -0,0 +1,17 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
+  <!-- Sun circle -->
+  <circle cx="16" cy="16" r="10" fill="#FDB813"/>
+  <!-- Sun rays -->
+  <g stroke="#FDB813" stroke-width="2" stroke-linecap="round">
+    <line x1="16" y1="2" x2="16" y2="5"/>
+    <line x1="16" y1="27" x2="16" y2="30"/>
+    <line x1="2" y1="16" x2="5" y2="16"/>
+    <line x1="27" y1="16" x2="30" y2="16"/>
+    <line x1="5.5" y1="5.5" x2="7.5" y2="7.5"/>
+    <line x1="24.5" y1="24.5" x2="26.5" y2="26.5"/>
+    <line x1="5.5" y1="26.5" x2="7.5" y2="24.5"/>
+    <line x1="24.5" y1="7.5" x2="26.5" y2="5.5"/>
+  </g>
+  <!-- Leaf in center -->
+  <path d="M16 12 Q20 16 16 22 Q12 16 16 12" fill="#22C55E"/>
+</svg>