Update web/past_data.html (#44)

- Update web/past_data.html (87310ed823a41aff4d95c0330caa33ee2765228b)


Co-authored-by: Vihaan Jyothiswaroop <meamgodyay@users.noreply.huggingface.co>

web/past_data.html

@@ -50,7 +50,28 @@
     const auth = getAuth(app);
     const db   = getFirestore(app);
 
-
+    let currentUser = null;
+    onAuthStateChanged(auth, (user) => {
+      const authNavItem = document.getElementById("authNavItem");
+      if (authNavItem) {
+        if (user) {
+          authNavItem.innerHTML =
+            '<button onclick="logout()" class="hover:text-[#6B9080] text-red-600">Logout</button>';
+        } else {
+          authNavItem.innerHTML =
+            '<a href="login.html" class="hover:text-[#6B9080]">Login</a>';
+        }
+      }
+    });
+    window.logout = async () => {
+      try {
+        await signOut(auth);
+        localStorage.clear();
+        window.location.href = "login.html";
+      } catch (error) {
+        console.error("Error signing out:", error);
+      }
+    };
     const statusEl = document.getElementById("auth-status");
     const recsEl   = document.getElementById("recs-container");
 
@@ -68,10 +89,6 @@
       if (debugBannerEl) debugBannerEl.textContent = `Debug: ${msg}`;
     }
 
-    window.logout = async () => {
-      try { await signOut(auth); localStorage.clear(); location.href = 'login.html'; }
-      catch (e) { console.error('Error signing out:', e); }
-    };
 
     window.toggleBox = function (id) {
       const content = document.getElementById(`box-content-${id}`);