feat(schedule): add schedule header with title and tooltip for configuration hints

frontend/src/App.tsx

@@ -1732,6 +1732,10 @@ function AppContent() {
 									</div>
 
 									<div className="schedule-overview">
+										<div className="schedule-header">
+											<span className="schedule-title">{t('settings.schedule.title')}</span>
+											<span className="info-tooltip" data-tooltip={t('settings.schedule.envHint')}>ⓘ</span>
+										</div>
 										<div className="schedule-row">
 											<span className="schedule-label">{t('settings.schedule.stockCheck')}</span>
 											<span className="schedule-value">{t('settings.schedule.dailyAt6')}</span>

frontend/src/i18n/de.json

@@ -165,12 +165,14 @@
       "supports": "Unterstützt ntfy, Discord, Telegram, Slack"
     },
     "schedule": {
+      "title": "Erinnerungsplan",
       "stockCheck": "Bestandsprüfung",
       "dailyAt6": "Täglich um 6:00 Uhr",
       "intakeCheck": "Einnahmeprüfung",
       "15minBefore": "15 Min. vor geplanter Zeit",
       "nextCheck": "Nächste Bestandsprüfung",
-      "lastSent": "Zuletzt gesendet"
+      "lastSent": "Zuletzt gesendet",
+      "envHint": "Diese Werte können über REMINDER_HOUR und REMINDER_MINUTES_BEFORE in .env konfiguriert werden"
     },
     "stock": {
       "title": "Bestand",

frontend/src/i18n/en.json

@@ -167,12 +167,14 @@
       "supports": "Supports ntfy, Discord, Telegram, Slack"
     },
     "schedule": {
+      "title": "Reminder Schedule",
       "stockCheck": "Stock check",
       "dailyAt6": "Daily at 6:00 AM",
       "intakeCheck": "Intake check",
       "15minBefore": "15 min before scheduled time",
       "nextCheck": "Next stock check",
-      "lastSent": "Last sent"
+      "lastSent": "Last sent",
+      "envHint": "These values can be configured via REMINDER_HOUR and REMINDER_MINUTES_BEFORE in .env"
     },
     "stock": {
       "title": "Stock",

frontend/src/styles.css

@@ -1531,6 +1531,23 @@ textarea {
   margin-bottom: 1.5rem;
 }
 
+.schedule-header {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  margin-bottom: 0.75rem;
+  padding-bottom: 0.5rem;
+  border-bottom: 1px solid var(--border-primary);
+}
+
+.schedule-title {
+  font-size: 0.8rem;
+  font-weight: 600;
+  color: var(--text-secondary);
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+}
+
 .schedule-row {
   display: flex;
   justify-content: space-between;