feat: add date display to CV projects and education templates

Projects now show startDate/endDate range. Education supports both
startDate/endDate (new) and year (backward compat) display.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

_includes/components/sections/cv-education.njk

@@ -18,7 +18,8 @@
     <div class="p-4 bg-white dark:bg-surface-800 rounded-lg border border-surface-200 dark:border-surface-700">
       <h3 class="font-semibold text-surface-900 dark:text-surface-100">{{ item.degree }}</h3>
       <p class="text-sm text-surface-600 dark:text-surface-400">
-        {{ item.institution }}{% if item.location %} &middot; {{ item.location }}{% endif %}{% if item.year %} &middot; {{ item.year }}{% endif %}
+        {{ item.institution }}{% if item.location %} &middot; {{ item.location }}{% endif %}
+        {% if item.startDate %} &middot; {{ item.startDate }}{% if item.endDate %} – {{ item.endDate }}{% else %} – Present{% endif %}{% elif item.year %} &middot; {{ item.year }}{% endif %}
       </p>
       {% if item.description %}
       <p class="text-sm text-surface-700 dark:text-surface-300 mt-1">{{ item.description }}</p>

_includes/components/sections/cv-projects.njk

@@ -35,6 +35,12 @@
         {% endif %}
       </div>
 
+      {% if item.startDate %}
+      <p class="text-xs text-surface-500 mb-1">
+        {{ item.startDate }}{% if item.endDate %} – {{ item.endDate }}{% else %} – Present{% endif %}
+      </p>
+      {% endif %}
+
       {% if item.description %}
       <p class="text-sm text-surface-600 dark:text-surface-400 mb-2">{{ item.description }}</p>
       {% endif %}