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/app/api/brainstorm/[sessionId]/route.ts

@@ -161,6 +161,7 @@ export async function PATCH(
     const updates: Record<string, any> = {}
     if (typeof body.isPublic === 'boolean') updates.isPublic = body.isPublic
     if (typeof body.guestCanEdit === 'boolean') updates.guestCanEdit = body.guestCanEdit
+    if (typeof body.seedIdea === 'string' && body.seedIdea.trim()) updates.seedIdea = body.seedIdea.trim()
 
     if (Object.keys(updates).length === 0) {
       return NextResponse.json({ error: 'No valid fields to update' }, { status: 400 })