Model ticket link counterparts explicitly

tests/Feature/Projects/ProjectTicketControllerTest.php

@@ -55,6 +55,7 @@ class ProjectTicketControllerTest extends TestCase
         ]);
         $ticketLinkType = TicketLinkType::factory()->for($project)->create([
             'label' => 'Relates to',
+            'counterpart_label' => 'Relates to',
             'position' => 1,
         ]);
 
@@ -137,6 +138,7 @@ class ProjectTicketControllerTest extends TestCase
                 ->where('ticket.worklog_entries.0.actor.name', $viewer->name)
                 ->where('linkedTickets.0.linked_ticket.ticket_key', 'CORE-2')
                 ->where('linkedTickets.0.ticket_link_type.label', 'Relates to')
+                ->where('linkedTickets.0.ticket_link_type.counterpart_label', 'Relates to')
                 ->where('repositoryBranches', [])
                 ->where('repositoryPullRequests', [])
                 ->where('canEditTicket', false)
@@ -144,6 +146,62 @@ class ProjectTicketControllerTest extends TestCase
             );
     }
 
+    /**
+     * Ensure linked tickets show the counterpart label from the other ticket perspective.
+     */
+    public function test_ticket_detail_uses_counterpart_link_label_for_target_ticket(): void
+    {
+        $viewer = User::factory()->create();
+        $project = Project::factory()->create([
+            'key' => 'CORE',
+        ]);
+
+        app(InitializeProjectTicketMetadata::class)->handle($project);
+
+        $priority = $project->ticketPriorities()->firstOrFail();
+        $taskType = $project->ticketTypes()
+            ->where('is_parent', false)
+            ->orderBy('position')
+            ->firstOrFail();
+        $sourceTicket = Ticket::factory()->create([
+            'project_id' => $project->id,
+            'sequence_number' => 1,
+            'ticket_key' => 'CORE-1',
+            'ticket_priority_id' => $priority->id,
+            'ticket_type_id' => $taskType->id,
+            'title' => 'Source ticket',
+        ]);
+        $targetTicket = Ticket::factory()->create([
+            'project_id' => $project->id,
+            'sequence_number' => 2,
+            'ticket_key' => 'CORE-2',
+            'ticket_priority_id' => $priority->id,
+            'ticket_type_id' => $taskType->id,
+            'title' => 'Target ticket',
+        ]);
+        $ticketLinkType = TicketLinkType::factory()->for($project)->create([
+            'label' => 'Blocks',
+            'counterpart_label' => 'Blocked by',
+            'position' => 1,
+        ]);
+
+        TicketLink::factory()->create([
+            'source_ticket_id' => $sourceTicket->id,
+            'target_ticket_id' => $targetTicket->id,
+            'ticket_link_type_id' => $ticketLinkType->id,
+        ]);
+
+        $this->syncProjectPermissions($project, $viewer, ['view']);
+
+        $this->actingAs($viewer)
+            ->get(route('projects.tickets.show', [$project, $targetTicket]))
+            ->assertOk()
+            ->assertInertia(fn (Assert $page) => $page
+                ->where('linkedTickets.0.linked_ticket.ticket_key', 'CORE-1')
+                ->where('linkedTickets.0.ticket_link_type.label', 'Blocked by')
+                ->where('linkedTickets.0.ticket_link_type.counterpart_label', 'Blocked by'));
+    }
+
     /**
      * Ensure project admins can still inspect the author when project author visibility is disabled.
      */