Save note content when editor disappears

Extract persistNote() from saveNote() to allow saving without closing
  the editor. Call persistNote() from onDisappear (when notch retracts)
  and cancelEdit() so user changes are never silently discarded.
  Empty new notes (no title, no content, no image) are skipped.

DynamicIsland/components/Notch/NotchNotesView.swift

@@ -102,6 +102,9 @@ struct NotchNotesView: View {
             updateLayoutState()
         }
         .onDisappear {
+            if isEditingNewNote || selectedNoteId != nil {
+                persistNote()
+            }
             coordinator.notesLayoutState = .list
         }
         .onChange(of: isEditingNewNote) { _, _ in
@@ -197,12 +200,17 @@ struct NotchNotesView: View {
         isEditingNewNote = false
     }
     
-    private func saveNote() {
+    private func persistNote() {
+        guard let id = editorNoteId else { return }
+
+        let isExistingNote = savedNotes.contains(where: { $0.id == id })
+        if !isExistingNote && editorTitle.isEmpty && editorContent.isEmpty && editorImageData == nil {
+            return
+        }
+
         var notes = savedNotes
         let now = Date()
 
-        if let id = editorNoteId {
-            // Priority: Save image to disk if it exists
         var fileName: String? = nil
         if let data = editorImageData {
             let name = "note_image_\(id.uuidString).png"
@@ -213,7 +221,6 @@ struct NotchNotesView: View {
 
         if let index = notes.firstIndex(where: { $0.id == id }) {
             // Update
-                // If there was an old image and it's being replaced or removed, delete old file
             if let oldFileName = notes[index].imageFileName, oldFileName != fileName {
                 let oldFileURL = NoteItem.noteImageDataDirectory.appendingPathComponent(oldFileName)
                 try? FileManager.default.removeItem(at: oldFileURL)
@@ -236,9 +243,12 @@ struct NotchNotesView: View {
             )
             notes.insert(newNote, at: 0)
         }
-            savedNotes = notes // Persistence fix: save back to @Default
+
+        savedNotes = notes
     }
 
+    private func saveNote() {
+        persistNote()
         closeEditor()
     }
     
@@ -311,6 +321,7 @@ struct NotchNotesView: View {
     }
 
     private func cancelEdit() {
+        persistNote()
         closeEditor()
     }