fix: normalize button sizes across sponsor management UI

Remove btn-sm from Lock/Unlock buttons on detail page and CSV/+ Sponsorship/
+ Sponsor buttons on list page so they match surrounding buttons.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: JacobCoffee

apps/sponsors/templates/sponsors/manage/sponsorship_detail.html

@@ -77,13 +77,13 @@ <h2>{{ sponsorship.sponsor.name }}</h2>
         {% if can_lock %}
         <form method="post" action="{% url 'manage_sponsorship_lock' sponsorship.pk %}" style="display:inline;">
             {% csrf_token %}<input type="hidden" name="action" value="lock">
-            <button type="submit" class="btn btn-sm btn-secondary">Lock</button>
+            <button type="submit" class="btn btn-secondary">Lock</button>
         </form>
         {% endif %}
         {% if can_unlock %}
         <form method="post" action="{% url 'manage_sponsorship_lock' sponsorship.pk %}" style="display:inline;">
             {% csrf_token %}<input type="hidden" name="action" value="unlock">
-            <button type="submit" class="btn btn-sm btn-gold">Unlock</button>
+            <button type="submit" class="btn btn-gold">Unlock</button>
         </form>
         {% endif %}
     </div>

apps/sponsors/templates/sponsors/manage/sponsorship_list.html

@@ -35,9 +35,9 @@
                 {% endif %}
             </div>
             <div style="margin-left:auto;display:flex;gap:6px;">
-                <a href="{% url 'manage_sponsorship_export' %}{% if filter_status or filter_year or filter_search %}?{% endif %}{% if filter_status %}status={{ filter_status }}{% endif %}{% if filter_status and filter_year %}&{% endif %}{% if filter_year %}year={{ filter_year }}{% endif %}{% if filter_year and filter_search or filter_status and filter_search %}&{% endif %}{% if filter_search %}search={{ filter_search }}{% endif %}" class="btn btn-sm btn-secondary">CSV</a>
-                <a href="{% url 'manage_composer' %}?new=1" class="btn btn-sm btn-primary">+ Sponsorship</a>
-                <a href="{% url 'manage_sponsor_create' %}" class="btn btn-sm btn-secondary" style="border:1px solid #ccc !important;">+ Sponsor</a>
+                <a href="{% url 'manage_sponsorship_export' %}{% if filter_status or filter_year or filter_search %}?{% endif %}{% if filter_status %}status={{ filter_status }}{% endif %}{% if filter_status and filter_year %}&{% endif %}{% if filter_year %}year={{ filter_year }}{% endif %}{% if filter_year and filter_search or filter_status and filter_search %}&{% endif %}{% if filter_search %}search={{ filter_search }}{% endif %}" class="btn btn-secondary">CSV</a>
+                <a href="{% url 'manage_composer' %}?new=1" class="btn btn-primary">+ Sponsorship</a>
+                <a href="{% url 'manage_sponsor_create' %}" class="btn btn-secondary" style="border:1px solid #ccc !important;">+ Sponsor</a>
             </div>
         </form>
     </div>