Fix admin phase change UI and ensure cookies on requests

wwwroot/app.js

@@ -341,7 +341,10 @@ function setupHandlers() {
     try {
       await adminApi.setPhase(phase);
       toast("Phase updated");
+      state.prevPhase = state.phase;
       state.phase = phase;
+      state.votesRendered = false;
+      renderPhasePill();
       $("phase-select").dataset.userEditing = "";
       await refreshPhaseData();
     } catch (err) {

wwwroot/js/api.js

@@ -11,6 +11,7 @@ const withBase = (path) => `${basePath}${path}`;
 async function request(path, { method = "GET", body } = {}) {
   const res = await fetch(withBase(path), {
     method,
+    credentials: "same-origin",
     headers: defaultHeaders,
     body: body ? JSON.stringify(body) : undefined,
   });