Open a TaskStream board from the panel's project form

A "TaskStream" section on the create form (toggle and optional key,
suggested from the slug) opens the board before saving, as the person
signed in, with the Pireon token of their session. A refusal shows on the
key field and a TaskStream outage as a notification; either way nothing is
saved. The created notification carries the link, and the edit page has
an "Open in TaskStream" button.

Documented in the user manual (and its PDF) and the README.

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

app/Filament/Resources/Projects/Pages/EditProject.php

@@ -9,6 +9,8 @@ use App\Filament\Resources\Projects\ProjectResource;
 use App\Filament\Support\DuplicateAction;
 use App\Filament\Support\PreviewAction;
 use App\Filament\Support\TranslateAction;
+use App\Services\TaskStream\TaskStreamClient;
+use Filament\Actions\Action;
 use Filament\Actions\DeleteAction;
 use Filament\Resources\Pages\EditRecord;
 
@@ -23,6 +25,13 @@ class EditProject extends EditRecord
         return [
             // Seeing it on the real site without leaving the form.
             PreviewAction::for('project'),
+            Action::make('taskstream')
+                ->label(__('panel.projects.taskstream.open'))
+                ->icon('heroicon-o-arrow-top-right-on-square')
+                ->color('gray')
+                ->url(fn () => app(TaskStreamClient::class)->projectUrl((string) $this->record->taskstream_key))
+                ->openUrlInNewTab()
+                ->visible(fn () => filled($this->record->taskstream_key)),
             DuplicateAction::make(),
             TranslateAction::make(),
             DeleteAction::make(),