Fix whitespace in periodic summary by inlining albums list

Inline periodic_albums_list computation into periodic_summary_formatted
using {%- -%} whitespace control to prevent unwanted whitespace in the
formatted output. Add documentation about this Jinja2 pattern to CLAUDE.md.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -59,4 +59,32 @@ Zigbee/
 # Author: Alexei Dolgolyov (dolgolyov.alexei@gmail.com)
 ```
 
-When any blueprint file is moved ask if I need to update the link somewhere else.
+When any blueprint file is moved ask if I need to update the link somewhere else.
+
+## Jinja2 Whitespace Issue
+
+Home Assistant evaluates all blueprint variables before conditions are checked. When a variable's Jinja2 template contains whitespace (newlines, indentation), that whitespace gets included in the output even if the template logic produces an empty string.
+
+**Problem:** Using a variable like `{{ my_variable }}` in string replacements will include unwanted whitespace.
+
+**Solution:** Compute complex values inline where they're used, with `{%- -%}` whitespace control:
+
+```yaml
+# BAD - whitespace from my_list variable will be included
+my_list: >
+  {% for item in items %}
+    {{ item }}
+  {% endfor %}
+
+result: "{{ template | replace('{items}', my_list) }}"
+
+# GOOD - inline computation with whitespace control
+result: >
+  {%- set ns = namespace(items = '') -%}
+  {%- for item in items -%}
+    {%- set ns.items = ns.items ~ item -%}
+  {%- endfor -%}
+  {{ template | replace('{items}', ns.items) }}
+```
+
+This pattern is used throughout the Immich Album Watcher blueprint for `common_date`, `common_location`, `video_warning`, and `periodic_albums_list`.

Common/Immich Album Watcher/blueprint.yaml

@@ -1077,39 +1077,35 @@ variables:
       {{ false }}
     {% endif %}
 
-  # Format the albums list for periodic summary
-  # Reads album name, share URL, and dates from album ID entity's attributes
-  periodic_albums_list: >
-    {% set ns = namespace(items = '') %}
-    {% for i in range(album_id_entities | length) %}
-      {% set entity_id = album_id_entities[i] %}
-      {% set id = states(entity_id) | default('') %}
-      {% if id | length > 0 and id not in ['unknown', 'unavailable'] %}
-        {% set name_attr = state_attr(entity_id, 'album_name') %}
-        {% set name = name_attr if name_attr not in [none, '', 'unknown', 'unavailable'] else id %}
-        {% set url_attr = state_attr(entity_id, 'share_url') %}
-        {% set url = url_attr if url_attr not in [none, 'unknown', 'unavailable'] else '' %}
-        {% set created_attr = state_attr(entity_id, 'created_at') | default('', true) %}
-        {% set created_dt = created_attr | as_datetime(none) if created_attr is string and created_attr | length > 0 else none %}
-        {% set album_created = created_dt.strftime(date_format) if created_dt else '' %}
-        {% set updated_attr = state_attr(entity_id, 'last_updated_at') | default('', true) %}
-        {% set updated_dt = updated_attr | as_datetime(none) if updated_attr is string and updated_attr | length > 0 else none %}
-        {% set album_updated = updated_dt.strftime(date_format) if updated_dt else '' %}
-        {% set item = periodic_album_template
+  # Complete periodic summary message
+  # Note: periodic_albums_list is computed inline to avoid whitespace issues
+  periodic_summary_formatted: >
+    {%- set ns = namespace(items = '') -%}
+    {%- for i in range(album_id_entities | length) -%}
+      {%- set entity_id = album_id_entities[i] -%}
+      {%- set id = states(entity_id) | default('') -%}
+      {%- if id | length > 0 and id not in ['unknown', 'unavailable'] -%}
+        {%- set name_attr = state_attr(entity_id, 'album_name') -%}
+        {%- set name = name_attr if name_attr not in [none, '', 'unknown', 'unavailable'] else id -%}
+        {%- set url_attr = state_attr(entity_id, 'share_url') -%}
+        {%- set url = url_attr if url_attr not in [none, 'unknown', 'unavailable'] else '' -%}
+        {%- set created_attr = state_attr(entity_id, 'created_at') | default('', true) -%}
+        {%- set created_dt = created_attr | as_datetime(none) if created_attr is string and created_attr | length > 0 else none -%}
+        {%- set album_created = created_dt.strftime(date_format) if created_dt else '' -%}
+        {%- set updated_attr = state_attr(entity_id, 'last_updated_at') | default('', true) -%}
+        {%- set updated_dt = updated_attr | as_datetime(none) if updated_attr is string and updated_attr | length > 0 else none -%}
+        {%- set album_updated = updated_dt.strftime(date_format) if updated_dt else '' -%}
+        {%- set item = periodic_album_template
           | replace('{album_name}', name)
           | replace('{album_id}', id)
           | replace('{album_url}', url)
           | replace('{album_created}', album_created)
-          | replace('{album_updated}', album_updated) %}
-        {% set ns.items = ns.items ~ item %}
-      {% endif %}
-    {% endfor %}
-    {{ ns.items }}
-
-  # Complete periodic summary message
-  periodic_summary_formatted: >
+          | replace('{album_updated}', album_updated) -%}
+        {%- set ns.items = ns.items ~ item -%}
+      {%- endif -%}
+    {%- endfor -%}
     {{ periodic_summary_message_template
-       | replace('{albums}', periodic_albums_list)
+       | replace('{albums}', ns.items)
        | replace('{album_count}', album_ids | length | string) }}
 
   # ---------------------------------------------------------------------------

manifest.json

@@ -1,3 +1,3 @@
 {
-  "version": "1.23.2"
+  "version": "1.23.3"
 }