feat: enhance medication reminder system with improved notifications and user settings updates

- Added new translation keys for empty and low stock notifications in both English and German.
- Implemented user authentication for planner routes and improved user settings loading.
- Separated empty and low stock medications for clearer notifications.
- Enhanced email notifications with detailed alerts for empty and low stock medications.
- Updated user settings in the database when reminders are sent for both intake and stock notifications.
- Improved form validation in the frontend with character limits and error messages.
- Added CSS styles for form validation feedback and character count display.

backend/src/services/intake-reminder-scheduler.ts

@@ -6,7 +6,7 @@ import { readFileSync, writeFileSync, existsSync } from "fs";
 import { resolve } from "path";
 import { getAllUserSettings, sendShoutrrrNotification, type UserSettings } from "../routes/settings.js";
 import { getTranslations, t, getDateLocale, type Language } from "../i18n/translations.js";
-import { getReminderState, updateReminderSentTime } from "./reminder-scheduler.js";
+import { getReminderState, updateReminderSentTime, updateUserReminderSentTime } from "./reminder-scheduler.js";
 
 type Blister = { usage: number; every: number; start: string };
 
@@ -380,6 +380,9 @@ async function checkAndSendIntakeRemindersForUser(
     // Update global reminder state for UI display
     const channel = emailSuccess && shoutrrrSuccess ? "both" : emailSuccess ? "email" : "push";
     updateReminderSentTime("intake", channel);
+    
+    // Also update user settings in database so frontend can display the info
+    await updateUserReminderSentTime(settings.userId, "intake", channel);
   }
 }