feat: add slides generation tool with multiple slide types

- Add slides.tool.ts with support for title, bullets, chart, stats, table, cards, timeline, quote, comparison, equation, image, summary slide types
- Chart types: bar, horizontal-bar, line, donut, radar
- Integrate with agent executor and canvas system
- Add multilingual support (en/fr)
- Various UI improvements and bug fixes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

memento-note/components/ai-chat.tsx

@@ -279,7 +279,7 @@ export function AIChat({ showFloatingTrigger = true }: { showFloatingTrigger?: b
                     <div className="w-12 h-12 rounded-full border border-dashed border-concrete/10 flex items-center justify-center">
                       <MessageSquare size={18} />
                     </div>
-                    <p className="text-[11px] italic leading-relaxed px-12">{t('ai.welcomeMsg')}</p>
+                    <p className="text-[11px] italic leading-relaxed px-6">{t('ai.welcomeMsg')}</p>
                   </div>
                 )}