Add optional cancellation message for notifications

dictionaries/en.json

@@ -36,6 +36,11 @@
         "bookedSuccess": "Spot booked!",
         "bookError": "Failed to book spot. Maybe it was just taken?",
         "cancelConfirm": "Are you sure you want to remove this entry?",
+        "cancelTitle": "Cancel Booking",
+        "cancelMessageLabel": "Message (optional)",
+        "cancelMessagePlaceholder": "I can't make it because...",
+        "cancelSubmit": "Confirm Cancellation",
+        "cancel": "Cancel",
         "cancelSuccess": "Entry removed",
         "cancelError": "Failed to remove entry",
         "noInstructions": "No specific instructions provided yet."
@@ -64,7 +69,7 @@
     "notifications": {
         "ownerHome": "🏠 OWNER HOME: Marked for {date}.\nPlan: {url}",
         "newBooking": "✅ NEW BOOKING: {name} is sitting on {date}.\nPlan: {url}",
-        "cancellation": "🚨 CANCELLATION: {name} removed their booking for {date}.\nPlan: {url}",
+        "cancellation": "🚨 CANCELLATION: {name} removed their booking for {date}.{message}\nPlan: {url}",
         "instructionsUpdated": "📝 UPDATED: Cat instructions have been modified.\nPlan: {url}"
     }
 }