feat(NotesPage, MarkdownEditor): enhance note creation and editing experience

- Added state management for new notes in NotesPageClient to track if a note is newly created.
- Updated MarkdownEditor to support initial editing state and handle editing changes, improving user interaction during note creation and editing.

src/app/notes/NotesPageClient.tsx

@@ -20,6 +20,7 @@ interface NotesPageClientProps {
 function NotesPageContent({ initialNotes }: { initialNotes: Note[] }) {
   const [notes, setNotes] = useState<Note[]>(initialNotes);
   const [selectedNote, setSelectedNote] = useState<Note | null>(null);
+  const [isNewNote, setIsNewNote] = useState(false);
   const { tags: availableTags } = useTasksContext();
   const [error, setError] = useState<string | null>(null);
   const [hasUnsavedChanges, setHasUnsavedChanges] = useState(false);
@@ -46,6 +47,7 @@ function NotesPageContent({ initialNotes }: { initialNotes: Note[] }) {
       }
 
       setSelectedNote(note);
+      setIsNewNote(false);
       setHasUnsavedChanges(false);
     },
     [hasUnsavedChanges, selectedNote]
@@ -60,6 +62,7 @@ function NotesPageContent({ initialNotes }: { initialNotes: Note[] }) {
 
       setNotes((prev) => [newNote, ...prev]);
       setSelectedNote(newNote);
+      setIsNewNote(true);
       setHasUnsavedChanges(false);
     } catch (err) {
       setError('Erreur lors de la création de la note');
@@ -128,6 +131,7 @@ function NotesPageContent({ initialNotes }: { initialNotes: Note[] }) {
       );
 
       setHasUnsavedChanges(false);
+      setIsNewNote(false);
     } catch (err) {
       setError('Erreur lors de la sauvegarde');
       console.error('Error saving note:', err);
@@ -279,6 +283,12 @@ function NotesPageContent({ initialNotes }: { initialNotes: Note[] }) {
                     onToggleSidebar={() =>
                       setSidebarCollapsed(!sidebarCollapsed)
                     }
+                    initialIsEditing={isNewNote}
+                    onEditingChange={(isEditing) => {
+                      if (!isEditing) {
+                        setIsNewNote(false);
+                      }
+                    }}
                     className="h-full"
                   />
                 </div>