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/lib/ai/providers/custom-openai.ts

@@ -83,21 +83,23 @@ export class CustomOpenAIProvider implements AIProvider {
 
   async generateTitles(prompt: string): Promise<TitleSuggestion[]> {
     try {
-      const { object } = await generateObject({
+      // Use generateText instead of generateObject — DeepSeek doesn't support
+      // response_format: json_schema via the OpenAI compat layer
+      const { text } = await aiGenerateText({
         model: this.model,
-        schema: z.object({
-          titles: z.array(z.object({
-            title: z.string().describe('Suggested title'),
-            confidence: z.number().min(0).max(1).describe('Confidence level between 0 and 1')
-          }))
-        }),
         prompt: prompt,
-      });
+      })
 
-      return object.titles;
+      // Parse the JSON array from the text response — strip markdown code fences if present
+      const parsed = JSON.parse(text.replace(/^```json\n?/,'').replace(/\n?```$/,'').trim())
+      const titles = Array.isArray(parsed) ? parsed : (parsed.titles || parsed.suggestions || [])
+      return titles.map((t: any) => ({
+        title: typeof t === 'string' ? t : t.title || t.name || '',
+        confidence: typeof t === 'number' ? t : (t.confidence || t.score || 0.5),
+      }))
     } catch (e) {
-      console.error('Error generating titles (Custom OpenAI):', e);
-      return [];
+      console.error('Error generating titles (Custom OpenAI):', e)
+      return []
     }
   }