chore: clean up code formatting and remove unnecessary whitespace across multiple files for improved readability

src/app/api/sessions/route.ts

@@ -45,10 +45,7 @@ export async function POST(request: Request) {
     const { title, collaborator } = body;
 
     if (!title || !collaborator) {
-      return NextResponse.json(
-        { error: 'Titre et collaborateur requis' },
-        { status: 400 }
-      );
+      return NextResponse.json({ error: 'Titre et collaborateur requis' }, { status: 400 });
     }
 
     const newSession = await prisma.session.create({
@@ -68,4 +65,3 @@ export async function POST(request: Request) {
     );
   }
 }
-