feat: add Admin blueprint for trip page type with date range, cover image, and album URL fields

themes/intotheeast/blueprints/trip.yaml

@@ -0,0 +1,38 @@
+title: 'Trip'
+'@extends':
+    type: default
+    context: blueprints://pages
+
+form:
+  fields:
+    tabs:
+      type: tabs
+      active: 1
+      fields:
+        trip:
+          type: tab
+          title: Trip
+          fields:
+            header.date_start:
+              type: date
+              label: 'Start Date'
+              placeholder: '2026-06-17'
+              help: 'First day of the trip'
+
+            header.date_end:
+              type: date
+              label: 'End Date'
+              placeholder: ''
+              help: 'Leave blank if trip is ongoing'
+
+            header.cover_image:
+              type: text
+              label: 'Cover Image Filename'
+              placeholder: 'cover.jpg'
+              help: 'Used in the trips listing page'
+
+            header.album_url:
+              type: text
+              label: 'Photo Album URL'
+              placeholder: 'https://photos.google.com/...'
+              help: 'Link to external photo album for this trip'