feat: brainstorm sessions, PDF document Q&A, embedding fixes, and UI improvements

- Add brainstorm feature with collaborative canvas, AI idea generation, live cursors, playback, and export
- Add PDF upload/extraction/ingestion pipeline with pgvector document search (RAG)
- Add document Q&A overlay with streaming chat and PDF preview
- Add note attachments UI with status polling, grid layout, and auto-scroll
- Add task extraction AI tool and agent executor improvements
- Fix NoteEmbedding missing updatedAt column, re-index 66 notes with 1536-dim embeddings
- Fix brainstorm 'Create Note' button: add success toast and redirect to created note
- Fix memory echo notification infinite polling
- Fix chat route to always include document_search tool
- Add brainstorm i18n keys across all 14 locales
- Add socket server for real-time brainstorm collaboration
- Add hierarchical notebook selector and organize notebook dialog improvements
- Add sidebar brainstorm section with session management
- Update prisma schema with brainstorm tables, attachments, and document chunks

memento-note/lib/ai/tools/task-extract.tool.ts

@@ -0,0 +1,106 @@
+import { tool } from 'ai'
+import { z } from 'zod'
+import { toolRegistry } from './registry'
+import { prisma } from '@/lib/prisma'
+import { getTagsProvider } from '@/lib/ai/factory'
+import { getSystemConfig } from '@/lib/config'
+
+toolRegistry.register({
+  name: 'task_extract',
+  description: 'Extract action items (TODOs) from notes in a notebook. Reads all notes, identifies tasks with assignees and deadlines, and creates a synthesis note.',
+  isInternal: true,
+  buildTool: (ctx) =>
+    tool({
+      description: 'Extract action items from notes in a notebook. Creates a new note with all identified tasks.',
+      inputSchema: z.object({
+        notebookId: z.string().optional().describe('Notebook ID to scan. If omitted, scans all user notes.'),
+        noteIds: z.array(z.string()).optional().describe('Specific note IDs to scan instead of a whole notebook.'),
+        locale: z.string().optional().describe('Language for the output (fr, en, es, de, etc.)'),
+      }),
+      execute: async ({ notebookId, noteIds, locale }) => {
+        try {
+          let where: any = { userId: ctx.userId, trashedAt: null }
+          if (noteIds && noteIds.length > 0) {
+            where.id = { in: noteIds }
+          } else if (notebookId) {
+            where.notebookId = notebookId
+          }
+
+          const notes = await prisma.note.findMany({
+            where,
+            select: { id: true, title: true, content: true },
+            orderBy: { updatedAt: 'desc' },
+            take: 50,
+          })
+
+          if (notes.length === 0) {
+            return { error: 'No notes found to analyze' }
+          }
+
+          const notesContext = notes.map(n =>
+            `[ID: ${n.id}] "${n.title}":\n${(n.content || '').slice(0, 800)}`
+          ).join('\n\n---\n\n')
+
+          const lang = locale === 'fr' ? 'français' : locale === 'es' ? 'espagnol' : locale === 'de' ? 'allemand' : locale === 'it' ? 'italien' : locale === 'pt' ? 'portugais' : locale === 'nl' ? 'néerlandais' : locale === 'ru' ? 'russe' : locale === 'zh' ? 'chinois' : locale === 'ja' ? 'japonais' : locale === 'ar' ? 'arabe' : locale === 'fa' ? 'persan' : locale === 'hi' ? 'hindi' : 'English'
+
+          const config = await getSystemConfig()
+          const provider = getTagsProvider(config)
+
+          const prompt = `You are a task extraction specialist. Analyze the following notes and extract ALL action items, tasks, and TODOs.
+
+For each task identified, provide:
+- **Task**: Clear, actionable description
+- **Source**: The note title where it was found
+- **Assignee**: If mentioned (otherwise "Unassigned")
+- **Deadline**: If mentioned (otherwise "No deadline")
+- **Priority**: High/Medium/Low based on urgency signals in the text
+- **Status**: If already completed or in-progress based on context
+
+NOTES TO ANALYZE:
+${notesContext}
+
+Respond in ${lang}. Structure the output as a clean Markdown document with:
+1. A summary paragraph
+2. Tasks grouped by priority (High → Medium → Low)
+3. A summary table at the end
+
+Format each task as:
+### [Priority] Task Title
+- **Description**: ...
+- **Source note**: ...
+- **Assignee**: ...
+- **Deadline**: ...
+- **Status**: ...`
+
+          const result = await provider.generateText(prompt)
+
+          const summaryTitle = locale === 'fr'
+            ? `Action Items — ${new Date().toLocaleDateString('fr-FR')}`
+            : `Action Items — ${new Date().toLocaleDateString('en-US')}`
+
+          const createdNote = await prisma.note.create({
+            data: {
+              title: summaryTitle,
+              content: result,
+              type: 'markdown',
+              isMarkdown: true,
+              autoGenerated: true,
+              userId: ctx.userId,
+              notebookId: notebookId || null,
+            },
+            select: { id: true, title: true },
+          })
+
+          return {
+            success: true,
+            noteId: createdNote.id,
+            title: createdNote.title,
+            notesAnalyzed: notes.length,
+            tasksNoteUrl: `/notes/${createdNote.id}`,
+          }
+        } catch (e: any) {
+          return { error: `Task extraction failed: ${e.message}` }
+        }
+      },
+    }),
+})