Fix issues #6, #7, #11, #12, #13: med reminders, push notifications, auth persistence, scheduling conflicts

- Fix TIME object vs string comparison in scheduler preventing adaptive med
  reminders from ever firing (#12, #6)
- Add frequency filtering to midnight schedule creation for every_n_days meds
- Require start_date and interval_days for every_n_days medications
- Add refresh token support (30-day) to API and bot for persistent sessions (#13)
- Add "trusted device" checkbox to frontend login for long-lived sessions (#7)
- Auto-refresh expired tokens in both bot (apiRequest) and frontend (api.ts)
- Restore bot sessions from cache on restart using refresh tokens
- Duration-aware routine scheduling conflict detection (#11)
- Add conflict check when starting routine sessions against medication times
- Add diagnostic logging to notification delivery channels

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/notifications.py

@@ -18,18 +18,27 @@ logger = logging.getLogger(__name__)
 def _sendToEnabledChannels(notif_settings, message, user_uuid=None):
     """Send message to all enabled channels. Returns True if at least one succeeded."""
     sent = False
+    logger.info(f"Sending notification to user {user_uuid}: {message[:80]}")
 
     if notif_settings.get("discord_enabled") and notif_settings.get("discord_user_id"):
         if discord.send_dm(notif_settings["discord_user_id"], message):
+            logger.debug(f"Discord DM sent to {notif_settings['discord_user_id']}")
             sent = True
 
     if notif_settings.get("ntfy_enabled") and notif_settings.get("ntfy_topic"):
         if ntfy.send(notif_settings["ntfy_topic"], message):
+            logger.debug(f"ntfy sent to topic {notif_settings['ntfy_topic']}")
             sent = True
 
     if notif_settings.get("web_push_enabled") and user_uuid:
         if web_push.send_to_user(user_uuid, message):
+            logger.debug(f"Web push sent for user {user_uuid}")
             sent = True
+        else:
+            logger.warning(f"Web push failed or no subscriptions for user {user_uuid}")
+
+    if not sent:
+        logger.warning(f"No notification channels succeeded for user {user_uuid}")
 
     return sent