feat: enrich activity job display with manga/chapter context

- Add mangaTitle to ScrapingJob context at creation time
- Fix job.js constructor to map failureReason, attempts, maxAttempts, context from API
- JobItem: show readable type label, manga name, chapter number, source and attempts counter

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Domain/Scraping/Application/CommandHandler/ScrapeChapterHandler.php

@@ -78,6 +78,7 @@ readonly class ScrapeChapterHandler
                     // Ajout de l'ID du chapitre et du slug dans le contexte du job
                     $job->context['chapterId'] = $command->chapterId;
                     $job->context['slug'] = $slug;
+                    $job->context['mangaTitle'] = $manga->getTitle();
 
                     $job->start();
                     $this->jobRepository->save($job);