feat(Notes): associate notes with tasks and enhance note management

- Added taskId field to Note model for associating notes with tasks.
- Updated API routes to handle taskId in note creation and updates.
- Enhanced NotesPageClient to manage task associations within notes.
- Integrated task selection in MarkdownEditor for better user experience.
- Updated NotesService to map task data correctly when retrieving notes.

prisma/schema.prisma

@@ -51,6 +51,7 @@ model Task {
   primaryTag       Tag?            @relation("PrimaryTag", fields: [primaryTagId], references: [id])
   dailyCheckboxes  DailyCheckbox[]
   taskTags         TaskTag[]
+  notes            Note[]          // Notes associées à cette tâche
 
   @@unique([source, sourceId])
   @@map("tasks")
@@ -129,9 +130,11 @@ model Note {
   title     String
   content   String   // Markdown content
   userId    String
+  taskId    String?  // Tâche associée à la note
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
   user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  task      Task?    @relation(fields: [taskId], references: [id])
   noteTags  NoteTag[]
 }