feat: add plan title and interval editing to settings

- Add Settings button label i18n (de: Einstellungen)
- Allow editing plan title, feeding per day, feeding interval, and litter interval
- Update PlanSettings component with new form fields
- Add German and English translations for new settings
- Update Plan type to include title property

dictionaries/en.json

@@ -66,8 +66,10 @@
         "error": "Invalid password"
     },
     "settings": {
+        "label": "Settings",
         "title": "Plan Settings",
         "description": "Update the cat care instructions or notification webhook.",
+        "titleLabel": "Plan Title",
         "webhookLabel": "Notification Webhook (Discord/Telegram)",
         "webhookPlaceholder": "https://discord.com/api/webhooks/...",
         "webhookDesc": "Get notified on Discord/Telegram when someone books or cancels.",
@@ -75,6 +77,9 @@
         "instructionsPlaceholder": "Food: 2x daily, Litter: daily...",
         "notifyAllLabel": "Notify for all events",
         "notifyAllDesc": "If disabled, only cancellations will be notified.",
+        "feedingPerDayLabel": "Feeding times per feeding day",
+        "feedingIntervalLabel": "Feeding interval (days)",
+        "litterIntervalLabel": "Litter cleaning interval (days)",
         "save": "Save changes",
         "saving": "Saving...",
         "success": "Settings updated!",