fix(local_time): handle date objects, not just datetime

ssl_expires_at is a date, not datetime — calling .tzinfo on it crashes.
Now checks hasattr(dt, 'hour') to distinguish date from datetime.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app.py

@@ -227,6 +227,9 @@ def local_time_filter(dt, fmt='%d.%m.%Y %H:%M'):
     """Convert naive UTC datetime to Europe/Warsaw and format."""
     if not dt:
         return ''
+    # date objects (not datetime) — format directly, no timezone conversion
+    if not hasattr(dt, 'hour'):
+        return dt.strftime(fmt)
     if dt.tzinfo is None:
         dt = dt.replace(tzinfo=_UTC_TZ)
     return dt.astimezone(_WARSAW_TZ).strftime(fmt)