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/note-title-block.tsx

@@ -29,8 +29,8 @@ export function NoteTitleBlock() {
             }}
             disabled={readOnly}
             className={cn(
-              'w-full text-4xl md:text-5xl font-memento-serif font-bold border-0 outline-none px-0 bg-transparent text-foreground leading-tight',
-              'placeholder:text-foreground/20 resize-none overflow-hidden',
+              'w-full text-4xl md:text-5xl font-memento-serif font-bold border-0 outline-none px-0 bg-transparent text-foreground leading-tight break-words',
+              'placeholder:text-foreground/20 resize-none overflow-hidden break-words',
               !readOnly && 'pr-12'
             )}
           />
@@ -39,21 +39,26 @@ export function NoteTitleBlock() {
             <button
               type="button"
               onClick={async () => {
+                console.log('[TITLE] Sparkles button clicked')
                 const plain = state.content.replace(/<[^>]+>/g, ' ').trim()
                 const wordCount = plain.split(/\s+/).filter(Boolean).length
+                console.log('[TITLE] Content length:', plain.length, 'Word count:', wordCount)
                 if (wordCount < 10) {
                   toast.error('Ajoutez au moins 10 mots avant de générer un titre.')
                   return
                 }
                 actions.setIsProcessingAI(true)
                 try {
+                  console.log('[TITLE] Calling /api/ai/title-suggestions...')
                   const res = await fetch('/api/ai/title-suggestions', {
                     method: 'POST',
                     headers: { 'Content-Type': 'application/json' },
                     body: JSON.stringify({ content: plain }),
                   })
+                  console.log('[TITLE] API response:', res.status)
                   if (res.ok) {
                     const data = await res.json()
+                    console.log('[TITLE] Suggestions:', data.suggestions)
                     const s = data.suggestions?.[0]?.title ?? ''
                     if (s) {
                       actions.setTitle(s)
@@ -62,9 +67,14 @@ export function NoteTitleBlock() {
                       toast.error('Impossible de générer un titre.')
                     }
                   } else {
+                    const err = await res.text()
+                    console.error('[TITLE] API error:', err)
                     toast.error('Erreur lors de la génération du titre.')
                   }
-                } catch { toast.error('Erreur réseau.') } finally { actions.setIsProcessingAI(false) }
+                } catch (e) {
+                  console.error('[TITLE] Fetch failed:', e)
+                  toast.error('Erreur réseau.')
+                } finally { actions.setIsProcessingAI(false) }
               }}
               disabled={state.isProcessingAI}
               className="absolute right-0 top-2 opacity-0 group-hover:opacity-60 hover:!opacity-100 transition-opacity rounded-lg p-2 text-foreground/50 hover:bg-black/5"