fix(story): end_date format Y-m-d H:i; fix guard comparison; remove test data

Blueprint: end_date format changed to Y-m-d H:i (same as start date) so
Admin2 uses the identical datepicker — avoids ambiguous d-m-Y input being
misread by PHP as m-d-Y.

Template guard: was comparing end_date string against page.date|date('Y-m-d')
which can never match. Now compares date-only parts of both fields:
page.header.end_date|date('Y-m-d') != page.date|date('Y-m-d')

Montalcino live page: removed test end_date '12-09-2026 00:00'.

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'
+              format: 'Y-m-d H:i'
               help: 'Optional — leave blank for a single-day story'
 
             header.hero_image:

themes/intotheeast/templates/story.html.twig

@@ -12,7 +12,7 @@
 {% endif %}
 
 {% set date_str = page.date|date('d M Y') %}
-{% if page.header.end_date and page.header.end_date != page.date|date('Y-m-d') %}
+{% if page.header.end_date and page.header.end_date|date('Y-m-d') != page.date|date('Y-m-d') %}
     {% set sd = page.date|date('d') %}
     {% set sm = page.date|date('M') %}
     {% set sy = page.date|date('Y') %}