Show the peer device/port in component connection columns

Add ConceptComponent.peer, returning the component on the other end
of its cable (whichever termination isn't itself). Use it in the
component tables' "Connection" column (Device > Port, both linked,
mirroring NetBox's own link_peer style) instead of just linking to the
cable object, and on the component detail page's "Connected to" row
in place of the manual termination_a/b branch.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

netbox_rack_concept/tables.py

@@ -115,8 +115,21 @@ class ConceptComponentTable(NetBoxTable):
     concept = tables.Column(accessor='device__concept', linkify=True, verbose_name=_('Concept'))
     component_type = columns.ChoiceFieldColumn()
     color = columns.ColorColumn()
-    connection = tables.Column(
-        accessor='cable', linkify=True, orderable=False, verbose_name=_('Connection'), empty_values=()
+    connection = tables.TemplateColumn(
+        template_code="""
+            {% with peer=record.peer %}
+              {% if peer %}
+                <a href="{{ peer.device.get_absolute_url }}">{{ peer.device }}</a>
+                <i class="mdi mdi-chevron-right"></i>
+                <a href="{{ peer.get_absolute_url }}">{{ peer }}</a>
+              {% else %}
+                {{ ''|placeholder }}
+              {% endif %}
+            {% endwith %}
+        """,
+        verbose_name=_('Connection'),
+        orderable=False,
+        empty_values=()
     )
     connect = tables.TemplateColumn(
         template_code="""
@@ -139,9 +152,6 @@ class ConceptComponentTable(NetBoxTable):
         )
         default_columns = ('name', 'device', 'component_type', 'port_type', 'connection', 'connect')
 
-    def render_connection(self, value, record):
-        return value if value else _('Not connected')
-
 
 class ConceptCableTable(NetBoxTable):
     id = tables.Column(linkify=True, verbose_name=_('ID'))