Open a TaskStream board for a project that has none yet

The project form gets «Crear en TaskStream» while the project has no
board, and `taskstream: true` on a PATCH does the same through the API.
A refusal leaves the edit unsaved; a project with a board keeps it, and
`taskstream_key` without the flag is still ignored.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/Feature/Panel/TaskStreamPanelTest.php

@@ -19,8 +19,9 @@ use Tests\FakesPireon;
 use Tests\TestCase;
 
 /**
- * The panel's way to open a project's board in TaskStream: a toggle on the
- * create form, as the person signed in.
+ * The panel's way to open a project's board in TaskStream, as the person
+ * signed in: a toggle on the create form, or an action on a project that
+ * has none yet.
  */
 class TaskStreamPanelTest extends TestCase
 {
@@ -131,4 +132,41 @@ class TaskStreamPanelTest extends TestCase
 
         $this->assertSame(0, Project::withTrashed()->count());
     }
+
+    #[Test]
+    public function a_project_without_a_board_can_get_one_later(): void
+    {
+        $this->fakeTaskStream();
+        $project = Project::factory()->create(['slug' => ['es' => 'catalogo']]);
+
+        Livewire::test(EditProject::class, ['record' => $project->getRouteKey()])
+            ->assertActionHidden('taskstream')
+            ->assertActionVisible('createInTaskStream')
+            ->callAction('createInTaskStream', data: ['key' => 'cat'])
+            ->assertHasNoActionErrors()
+            ->assertNotified();
+
+        Http::assertSent(fn (Request $request) => $request->hasHeader('Authorization', 'Bearer session-token')
+            && $request['key'] === 'CAT'
+            && $request['isPublic'] === true);
+
+        $this->assertSame('CAT', $project->fresh()->taskstream_key);
+
+        Livewire::test(EditProject::class, ['record' => $project->getRouteKey()])
+            ->assertActionVisible('taskstream')
+            ->assertActionHidden('createInTaskStream');
+    }
+
+    #[Test]
+    public function a_refusal_later_keeps_the_project_without_a_board(): void
+    {
+        $this->fakeTaskStream(409, ['statusCode' => 409, 'message' => 'Project key WEB is already in use']);
+        $project = Project::factory()->create();
+
+        Livewire::test(EditProject::class, ['record' => $project->getRouteKey()])
+            ->callAction('createInTaskStream', data: ['key' => 'WEB'])
+            ->assertNotified(__('rules.taskstream.refused', ['reason' => 'Project key WEB is already in use']));
+
+        $this->assertNull($project->fresh()->taskstream_key);
+    }
 }