style(reader): améliorer la toolbar et l'UI du mode scroll

- Corriger la troncature de la toolbar (max-height 4rem → 5rem)
- Animer la toolbar en translateY pour un effet "bloc uni" avec le header
- Corriger le bug d'auto-hide du header après switch simple → scroll
- Augmenter la taille du titre de chapitre dans la toolbar (text-sm font-medium)
- Harmoniser le bouton scroll-to-top avec le style des ToolbarButtons
- Ajouter support de prop `class` sur les labels de ToolbarSection

src/Domain/Reader/Application/QueryHandler/GetChapterContextHandler.php

@@ -23,12 +23,13 @@ final readonly class GetChapterContextHandler
         $context = $this->chapterRepository->getChapterContext($chapterId);
 
         return new ChapterContextResponse(
-            $query->getChapterId(),
-            $context->getChapterTitle(),
-            $context->getNumber(),
-            $context->getTotalPages(),
-            $context->getPreviousChapterId()?->getValue(),
-            $context->getNextChapterId()?->getValue(),
+            id: $query->getChapterId(),
+            mangaId: $context->getMangaId(),
+            title: $context->getChapterTitle(),
+            number: $context->getNumber(),
+            totalPages: $context->getTotalPages(),
+            previousChapterId: $context->getPreviousChapterId()?->getValue(),
+            nextChapterId: $context->getNextChapterId()?->getValue(),
         );
     }
 }

src/Domain/Reader/Application/Response/ChapterContextResponse.php

@@ -8,6 +8,7 @@ final readonly class ChapterContextResponse
 {
     public function __construct(
         private string  $id,
+        private string  $mangaId,
         private string  $title,
         private float   $number,
         private int     $totalPages,
@@ -21,6 +22,11 @@ final readonly class ChapterContextResponse
         return $this->id;
     }
 
+    public function getMangaId(): string
+    {
+        return $this->mangaId;
+    }
+
     public function getTitle(): string
     {
         return $this->title;

src/Domain/Reader/Domain/Model/ChapterContext.php

@@ -12,6 +12,7 @@ readonly class ChapterContext
         private ChapterId $id,
         private ?ChapterId $previousChapterId,
         private ?ChapterId $nextChapterId,
+        private string $mangaId,
         private string $mangaTitle,
         private float $number,
         private ?string $chapterTitle,
@@ -39,6 +40,11 @@ readonly class ChapterContext
         return $this->nextChapterId;
     }
 
+    public function getMangaId(): string
+    {
+        return $this->mangaId;
+    }
+
     public function getMangaTitle(): string
     {
         return $this->mangaTitle;

src/Domain/Reader/Infrastructure/ApiPlatform/State/Provider/ChapterContextProvider.php

@@ -27,6 +27,7 @@ final readonly class ChapterContextProvider implements ProviderInterface
 
         return new ChapterContextResponse(
             id: $response->getId(),
+            mangaId: $response->getMangaId(),
             title: $response->getTitle(),
             number: $response->getNumber(),
             totalPages: $response->getTotalPages(),

src/Domain/Reader/Infrastructure/Persistence/LegacyChapterRepository.php

@@ -49,6 +49,7 @@ readonly class LegacyChapterRepository implements ChapterRepositoryInterface
             id: $chapterId,
             previousChapterId: $this->getPreviousChapterId($chapterId),
             nextChapterId: $this->getNextChapterId($chapterId),
+            mangaId: (string) $chapter->getManga()->getId(),
             mangaTitle: $chapter->getManga()->getTitle(),
             number: $chapter->getNumber(),
             chapterTitle: $chapter->getTitle(),