add playwright tests

e2e/global-setup.ts

@@ -0,0 +1,13 @@
+import { execSync } from "child_process";
+import * as path from "path";
+
+/**
+ * Builds the Rust server before the test suite runs, so the fixture can launch
+ * `target/debug/sustenance` without requiring a manual `cargo build`.
+ */
+export default function globalSetup() {
+  execSync("cargo build", {
+    cwd: path.resolve(__dirname, ".."),
+    stdio: "inherit",
+  });
+}