Empty string sent to Appwrite datetime column was being interpreted as creation
timestamp, making every no-expiry sunum immediately expired. Fix:
- Only include expiresAt in payload when user actually set a date
- Convert date-only string (YYYY-MM-DD) to YYYY-MM-DDT23:59:59.000Z so the
sunum stays valid for the entire chosen day across all time zones
- Strip empty customerId/notes to avoid empty-string writes
- Sol: koyu panel — logo, özellikler listesi (portföy/eşleşme/sunum/müşteri), alt imza
- Sağ: temiz form — email + şifre, mobil responsive
- İşletmem referansları kaldırıldı, Emlak CRM olarak güncellendi