feat: configurable post-graph section and dedicated /graph page

- Add posting-activity.njk section template with configurable years/limit
- Register posting-activity in homepage-section.njk dispatcher
- Move hardcoded post-graph into Tier 2 block (homepage builder controls its own)
- Add "View full history" link to /graph/ on both Tier 2 and section template
- Create /graph/ page showing all years with no limit

Confab-Link: http://localhost:8080/sessions/edb1b7b0-da66-4486-bd9c-d1cfa7553b88

_includes/components/homepage-section.njk

@@ -49,6 +49,8 @@
   {% include "components/sections/funkwhale.njk" ignore missing %}
 {% elif section.type == "lastfm" %}
   {% include "components/sections/lastfm.njk" ignore missing %}
+{% elif section.type == "posting-activity" %}
+  {% include "components/sections/posting-activity.njk" ignore missing %}
 {% else %}
   <!-- Unknown section type: {{ section.type }} -->
 {% endif %}

_includes/components/sections/posting-activity.njk

@@ -0,0 +1,24 @@
+{# Posting Activity Section — configurable post-graph contribution grid #}
+{% set sectionConfig = section.config or {} %}
+{% set graphTitle = sectionConfig.title or "Posting Activity" %}
+
+{% if collections.posts and collections.posts.length %}
+<section class="mb-8 sm:mb-12">
+  <h2 class="text-xl sm:text-2xl font-bold text-surface-900 dark:text-surface-100 mb-4 sm:mb-6">
+    {{ graphTitle }}
+  </h2>
+  {% set graphOptions = {} %}
+  {% if sectionConfig.years and sectionConfig.years.length %}
+    {% set graphOptions = { only: sectionConfig.years } %}
+  {% elif sectionConfig.limit %}
+    {% set graphOptions = { limit: sectionConfig.limit } %}
+  {% endif %}
+  {% postGraph collections.posts, graphOptions %}
+  <a href="/graph/" class="text-sm text-accent-600 dark:text-accent-400 hover:underline mt-4 inline-flex items-center gap-1">
+    View full history
+    <svg class="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+      <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"/>
+    </svg>
+  </a>
+</section>
+{% endif %}

_includes/layouts/home.njk

@@ -140,12 +140,18 @@ withSidebar: true
   </div>
 </section>
 
-{% endif %} {# end two-tier fallback #}
-
-{# Posting Activity — contribution graph (shown on all homepage variants) #}
+{# Posting Activity — contribution graph (Tier 2 default only) #}
 {% if collections.posts and collections.posts.length %}
 <section class="mb-8 sm:mb-12">
   <h2 class="text-xl sm:text-2xl font-bold text-surface-900 dark:text-surface-100 mb-4 sm:mb-6">Posting Activity</h2>
   {% postGraph collections.posts %}
+  <a href="/graph/" class="text-sm text-accent-600 dark:text-accent-400 hover:underline mt-4 inline-flex items-center gap-1">
+    View full history
+    <svg class="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+      <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"/>
+    </svg>
+  </a>
 </section>
 {% endif %}
+
+{% endif %} {# end two-tier fallback #}

graph.njk

@@ -0,0 +1,18 @@
+---
+layout: layouts/base.njk
+title: Posting Activity
+permalink: /graph/
+withSidebar: true
+---
+
+<h1 class="text-2xl sm:text-3xl font-bold text-surface-900 dark:text-surface-100 mb-6">Posting Activity</h1>
+
+<p class="text-surface-600 dark:text-surface-400 mb-8">
+  A contribution-style graph showing posting frequency across all years.
+</p>
+
+{% if collections.posts and collections.posts.length %}
+  {% postGraph collections.posts, { limit: 0 } %}
+{% else %}
+  <p class="text-surface-500 dark:text-surface-400">No posts found.</p>
+{% endif %}