Add runtime environment detection

packages/ui/src/main.tsx

@@ -3,6 +3,7 @@ import App from "./App"
 import { ThemeProvider } from "./lib/theme"
 import { ConfigProvider } from "./stores/preferences"
 import { InstanceConfigProvider } from "./stores/instance-config"
+import { runtimeEnv } from "./lib/runtime-env"
 import "./index.css"
 import "@git-diff-view/solid/styles/diff-view-pure.css"
 
@@ -12,6 +13,11 @@ if (!root) {
   throw new Error("Root element not found")
 }
 
+if (typeof document !== "undefined") {
+  document.documentElement.dataset.runtimeHost = runtimeEnv.host
+  document.documentElement.dataset.runtimePlatform = runtimeEnv.platform
+}
+
 render(
   () => (
     <ConfigProvider>