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>

app/Http/Controllers/Api/V1/ProjectController.php

@@ -72,11 +72,22 @@ class ProjectController extends Controller
         return ProjectResource::make($project->load(self::WITH));
     }
 
-    public function update(ProjectRequest $request, Project $project): ProjectResource
+    /**
+     * `taskstream: true` opens a board for a project that has none yet, as on
+     * creation (and nothing is saved if that fails); one that has a board
+     * keeps it.
+     */
+    public function update(ProjectRequest $request, Project $project, OpenInTaskStream $openInTaskStream): ProjectResource
     {
         $this->authorize('update', $project);
 
-        return ProjectResource::make($this->persist($this->fill($project, $request), $request));
+        $project = $this->fill($project, $request);
+
+        if ($request->boolean('taskstream') && $project->taskstream_project_id === null) {
+            $openInTaskStream->handle($project, $request->user(), $request->bearerToken(), $request->validated('taskstream_key'));
+        }
+
+        return ProjectResource::make($this->persist($project, $request));
     }
 
     public function destroy(Project $project): JsonResponse