fix(story): smart date range formatting + blueprint end_date format fix

Blueprint: end_date format changed from 'Y-m-d H:i' to 'Y-m-d' — the
demo frontmatter stores dates without a time component so Admin was
failing to parse it and showing the field empty.

Template: three-case smart range formatting:
- Same month & year  → 01 – 03 Sep 2025
- Same year only     → 01 Jan – 03 Sep 2025
- Different years    → 01 Jan 2025 – 03 Feb 2026

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Vgmzx8VTTTmCskSpQtsLTr

themes/intotheeast/blueprints/story.yaml

@@ -27,7 +27,7 @@ form:
             header.end_date:
               type: datetime
               label: End Date
-              format: 'Y-m-d H:i'
+              format: 'Y-m-d'
               help: 'Optional — leave blank for a single-day story'
 
             header.hero_image:

themes/intotheeast/templates/story.html.twig

@@ -13,7 +13,19 @@
 
 {% set date_str = page.date|date('d M Y') %}
 {% if page.header.end_date %}
-    {% set date_str = page.date|date('d M Y') ~ ' – ' ~ page.header.end_date|date('d M Y') %}
+    {% set sd = page.date|date('d') %}
+    {% set sm = page.date|date('M') %}
+    {% set sy = page.date|date('Y') %}
+    {% set ed = page.header.end_date|date('d') %}
+    {% set em = page.header.end_date|date('M') %}
+    {% set ey = page.header.end_date|date('Y') %}
+    {% if sy == ey and sm == em %}
+        {% set date_str = sd ~ ' – ' ~ ed ~ ' ' ~ em ~ ' ' ~ ey %}
+    {% elseif sy == ey %}
+        {% set date_str = sd ~ ' ' ~ sm ~ ' – ' ~ ed ~ ' ' ~ em ~ ' ' ~ ey %}
+    {% else %}
+        {% set date_str = sd ~ ' ' ~ sm ~ ' ' ~ sy ~ ' – ' ~ ed ~ ' ' ~ em ~ ' ' ~ ey %}
+    {% endif %}
 {% endif %}
 
 {% set location = page.header.location_name ?? '' %}