feat: "spa", but more like single entry-point

polylan_submitter/src/bootstrap.ts

@@ -0,0 +1,11 @@
+// Per-page data Django injects via `{{ bootstrap|json_script:"bootstrap-data" }}`
+// in templates/app.html. Read once at boot, before the router/app are created.
+export const bootstrap: Record<string, unknown> = (() => {
+  const el = document.getElementById("bootstrap-data");
+  if (!el?.textContent) return {};
+  try {
+    return JSON.parse(el.textContent);
+  } catch {
+    return {};
+  }
+})();