Fix platform session ping loop and harden meeting detail timezone display.

Defer inconclusive auth ping 401s instead of clearing SSO sessions; add client keepalive and safe timezone fallback on room pages.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Models/Room.php

@@ -151,6 +151,19 @@ class Room extends Model
         return data_get($this->settings, $key, data_get(config('meet.default_settings'), $key, $default));
     }
 
+    public function safeTimezone(): string
+    {
+        $timezone = (string) ($this->timezone ?: 'UTC');
+
+        try {
+            new \DateTimeZone($timezone);
+
+            return $timezone;
+        } catch (\Throwable) {
+            return 'UTC';
+        }
+    }
+
     public function isLive(): bool
     {
         return $this->status === 'live';