feat: icon-only toolbar, versioning fixes, history modal, PanelRight repositioning

- Toolbar: remove text labels from all icon buttons (AI, Save, Preview, Convert)
  all buttons now icon-only with title tooltip for accessibility
- Toolbar: reposition PanelRight (info panel toggle) to far right after three-dot menu
- Versioning: decouple getNoteHistory/restoreNoteVersion from global userAISettings.noteHistory
  now checks note.historyEnabled directly — unblocks manual per-note history
- Versioning: add 'Sauvegarder cette version' button in Versions tab of info panel
  calls commitNoteHistory with visual feedback (spinner → success state)
- note-document-info-panel: import commitNoteHistory, add isSavingVersion state
- notes.ts: fix double guard that silently blocked all history operations

memento-note/components/note-editor/index.tsx

@@ -10,11 +10,12 @@ interface NoteEditorProps {
   readOnly?: boolean
   onClose: () => void
   fullPage?: boolean
+  onNoteSaved?: (savedNote: Note) => void
 }
 
-export function NoteEditor({ note, readOnly, onClose, fullPage = false }: NoteEditorProps) {
+export function NoteEditor({ note, readOnly, onClose, fullPage = false, onNoteSaved }: NoteEditorProps) {
   return (
-    <NoteEditorProvider note={note} readOnly={readOnly} fullPage={fullPage}>
+    <NoteEditorProvider note={note} readOnly={readOnly} fullPage={fullPage} onNoteSaved={onNoteSaved}>
       {fullPage ? (
         <NoteEditorFullPage onClose={onClose} />
       ) : (