feat(Notes): implement manual ordering for notes, add drag-and-drop functionality, and update related components for reordering

prisma/migrations/20260106000000_add_note_order/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable Note - Add order column
+ALTER TABLE "Note" ADD COLUMN "order" INTEGER NOT NULL DEFAULT 0;
+

prisma/schema.prisma

@@ -145,6 +145,7 @@ model Note {
   userId    String
   taskId    String?  // Tâche associée à la note
   folderId  String?  // Dossier contenant la note
+  order     Int      @default(0) // Ordre manuel de la note dans son dossier
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
   user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)