Keep login username prefilled via local storage

wwwroot/app.js

@@ -23,6 +23,9 @@ function toast(msg, isError = false) {
   setTimeout(() => toastEl.classList.add("hidden"), 2000);
 }
 
+const getSavedUsername = () => localStorage.getItem("last_username") || "";
+const setSavedUsername = (name) => localStorage.setItem("last_username", name);
+
 function setAuthUI(isAuthed) {
   const main = document.querySelector("main");
   const statusBar = document.querySelector(".status-bar");
@@ -35,19 +38,11 @@ function setAuthUI(isAuthed) {
     const adminCard = $("admin-card");
     if (adminCard) adminCard.classList.add("hidden");
     const loginUser = $("login-username");
-    const cachedUser = getCookie("player_username");
+    const cachedUser = getSavedUsername();
     if (loginUser && cachedUser) loginUser.value = cachedUser;
   }
 }
 
-function getCookie(name) {
-  const cookie = document.cookie
-    ?.split(";")
-    .map(c => c.trim())
-    .find(c => c.startsWith(name + "="));
-  return cookie ? decodeURIComponent(cookie.split("=").slice(1).join("=")) : null;
-}
-
 function setAuthMode(mode) {
   state.authMode = mode;
   document.querySelectorAll(".auth-form").forEach(form => {
@@ -261,6 +256,7 @@ function setupHandlers() {
       if (!username || !password) return toast("Username and password required", true);
       try {
         await api.login({ username, password });
+        setSavedUsername(username);
         state.isAuthenticated = true;
         setAuthUI(true);
         await refreshPhaseData();
@@ -283,6 +279,7 @@ function setupHandlers() {
       if (!username || !password) return toast("Username and password required", true);
       try {
         await api.register({ username, password, displayName, adminKey });
+        setSavedUsername(username);
         state.isAuthenticated = true;
         setAuthUI(true);
         await refreshPhaseData();
@@ -335,6 +332,7 @@ function setupHandlers() {
   if (logoutBtn) {
     logoutBtn.addEventListener("click", async (e) => {
       e.preventDefault();
+      const lastUser = state.me?.username;
       try {
         await api.logout();
       } catch (err) {
@@ -343,6 +341,11 @@ function setupHandlers() {
       clearUserState();
       state.isAuthenticated = false;
       setAuthUI(false);
+      if (lastUser) {
+        setSavedUsername(lastUser);
+        const loginUser = $("login-username");
+        if (loginUser) loginUser.value = lastUser;
+      }
     });
   }