feat: update favicon to match dashboard Activity icon

Created SVG icon that matches the Activity/pulse icon used in the app:
- Blue gradient background matching the app theme
- White pulse/activity line icon
- Updated layout.tsx to use the new SVG icon

app/layout.tsx

@@ -13,9 +13,9 @@ export const metadata: Metadata = {
   title: "Pulse - PSA Management System",
   description: "Modern dashboard for Autotask PSA integration with RMM and NMS mapping",
   icons: {
-    icon: "/favicon.ico",
-    shortcut: "/favicon.ico",
-    apple: "/favicon.ico",
+    icon: "/icon.svg",
+    shortcut: "/icon.svg",
+    apple: "/icon.svg",
   },
 };