Add connection review page with optional message on connection requests

- New GET route and template for reviewing individual connection requests
- Optional personal message field when sending connection requests
- Message visible to recipient on review page and connection list
- Dashboard "Review" button links to per-connection review page
- QR scan flow shows message prompt before sending request
- Fix accepted connections query: include both sent and received
- Fix url_for('uploaded_file') -> url_for('static', 'uploads/')
- Fix request.json -> request.is_json to avoid 415 on form POST
- Remove card from DOM on approve/reject instead of page reload

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

templates/attendee/dashboard.html

@@ -29,10 +29,36 @@
         </section>
     {% endif %}
 
+    {% if sent_pending_connections %}
+    <section class="sent-pending-section">
+        <h2>{{ 'connection_requests_sent'|t }}</h2>
+        <div class="connections-list">
+            {% for conn in sent_pending_connections %}
+                <div class="connection-card connection-pending">
+                    <h4><span class="first-name">{{ conn.first_name }}</span> <span class="last-name">{{ conn.last_name }}</span></h4>
+                    <p>{{ conn.organisation if conn.organisation else '' }}</p>
+                    <p class="connection-role">{{ conn.role if conn.role else '' }}</p>
+                    <span class="badge badge-pending">{{ 'request_pending'|t }}</span>
+                </div>
+            {% endfor %}
+        </div>
+    </section>
+    {% endif %}
+
     {% if pending_connections %}
     <section class="pending-section">
         <h2>{{ 'incoming_connection_requests'|t }}</h2>
-        <p><a href="{{ url_for('connection_requests') }}">{{ 'review_scan_requests'|t }}</a></p>
+        <div class="connections-list">
+            {% for conn in pending_connections %}
+                <div class="connection-card connection-incoming">
+                    <h4><span class="first-name">{{ conn.first_name }}</span> <span class="last-name">{{ conn.last_name }}</span></h4>
+                    <p>{{ conn.organisation if conn.organisation else '' }}</p>
+                    <p class="connection-role">{{ conn.role if conn.role else '' }}</p>
+                    <a href="{{ url_for('respond_to_connection', connection_id=conn.id) }}" class="btn btn-sm btn-outline">{{ 'review'|t }}</a>
+                </div>
+            {% endfor %}
+        </div>
+        <p><a href="{{ url_for('connection_requests') }}">{{ 'view_all_incoming_requests'|t }}</a></p>
     </section>
     {% endif %}
 
@@ -49,6 +75,7 @@
                         <h4 class="mb-3"><span class="first-name">{{ conn.first_name }}</span> <span class="last-name">{{ conn.last_name }}</span></h4>
                         <p class="connection-org mb-3">{{ conn.organisation if conn.organisation else '' }}</p>
                         <p class="connection-role">{{ conn.role if conn.role else '' }}</p>
+                        <span class="badge badge-success">{{ 'connected'|t }}</span>
                     </div>
                 {% endfor %}
             </div>