add utm params (#6441)

Author: codemist

src/app/components/client/toolbar/AppPicker.tsx

@@ -76,7 +76,9 @@ const getProducts = (referringHost: string, l10n: ReactLocalization) => ({
   },
   solo: {
     id: "solo",
-    url: `https://soloist.ai/`,
+    url: `https://soloist.ai/?utm_source=${encodeURIComponent(
+      referringHost,
+    )}&utm_medium=referral&utm_campaign=bento&utm_content=desktop`,
     title: l10n.getString("toolbar-app-picker-product-solo"),
     gaLabel: "solo",
     imgSrc: SoloLogo,