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/components/brainstorm/manual-idea-dialog.tsx

@@ -0,0 +1,98 @@
+'use client'
+
+import React, { useState } from 'react'
+import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription } from '@/components/ui/dialog'
+import { Lightbulb } from 'lucide-react'
+
+interface ManualIdeaDialogProps {
+  open: boolean
+  onOpenChange: (open: boolean) => void
+  onSubmit: (title: string, description?: string) => void
+  isLoading?: boolean
+  parentIdeaTitle?: string | null
+  t: (key: string) => string | undefined
+}
+
+export function ManualIdeaDialog({
+  open,
+  onOpenChange,
+  onSubmit,
+  isLoading,
+  parentIdeaTitle,
+  t,
+}: ManualIdeaDialogProps) {
+  const [title, setTitle] = useState('')
+  const [description, setDescription] = useState('')
+
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault()
+    if (!title.trim()) return
+    onSubmit(title.trim(), description.trim() || undefined)
+    setTitle('')
+    setDescription('')
+    onOpenChange(false)
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="sm:max-w-md bg-white dark:bg-[#1A1A1A] border-border rounded-2xl">
+        <DialogHeader>
+          <DialogTitle className="flex items-center gap-2 text-foreground">
+            <div className="w-7 h-7 rounded-lg bg-memento-blue/10 flex items-center justify-center">
+              <Lightbulb size={14} className="text-memento-blue" />
+            </div>
+            <span className="font-serif">{t('brainstorm.addIdea') || 'Add an idea'}</span>
+          </DialogTitle>
+          <DialogDescription className="text-muted-foreground text-xs">
+            {parentIdeaTitle
+              ? `${t('brainstorm.respondsTo') || 'Responds to'} « ${parentIdeaTitle.length > 40 ? parentIdeaTitle.substring(0, 40) + '…' : parentIdeaTitle} »`
+              : (t('brainstorm.manualIdeaDesc') || 'Share your idea with the brainstorm canvas')
+            }
+          </DialogDescription>
+        </DialogHeader>
+        <form onSubmit={handleSubmit} className="space-y-4 mt-2">
+          <div>
+            <label className="text-[10px] font-bold uppercase tracking-[0.15em] text-muted-foreground mb-1.5 block">
+              {t('brainstorm.manualIdeaTitle') || 'Title'}
+            </label>
+            <input
+              value={title}
+              onChange={(e) => setTitle(e.target.value)}
+              placeholder={t('brainstorm.manualIdeaTitlePlaceholder') || 'Your idea in a few words...'}
+              className="w-full px-4 py-3 text-sm border border-border rounded-xl bg-transparent focus:outline-none focus:ring-2 focus:ring-memento-blue/20 focus:border-memento-blue/40 transition-all font-serif"
+              autoFocus
+            />
+          </div>
+          <div>
+            <label className="text-[10px] font-bold uppercase tracking-[0.15em] text-muted-foreground mb-1.5 block">
+              {t('brainstorm.manualIdeaDescLabel') || 'Description (optional)'}
+            </label>
+            <textarea
+              value={description}
+              onChange={(e) => setDescription(e.target.value)}
+              placeholder={t('brainstorm.manualIdeaDescPlaceholder') || 'Elaborate on your idea...'}
+              className="w-full h-24 px-4 py-3 text-sm border border-border rounded-xl bg-transparent focus:outline-none focus:ring-2 focus:ring-memento-blue/20 focus:border-memento-blue/40 resize-none transition-all"
+            />
+          </div>
+          <div className="flex justify-end gap-2 pt-2">
+            <button
+              type="button"
+              onClick={() => onOpenChange(false)}
+              className="px-4 py-2 text-[10px] font-bold uppercase tracking-[0.15em] text-muted-foreground hover:text-foreground rounded-xl hover:bg-foreground/5 transition-all"
+            >
+              {t('brainstorm.cancel') || 'Cancel'}
+            </button>
+            <button
+              type="submit"
+              disabled={!title.trim() || isLoading}
+              className="px-5 py-2.5 bg-memento-blue hover:bg-memento-blue text-white text-[10px] font-bold uppercase tracking-[0.15em] rounded-xl disabled:opacity-50 transition-all flex items-center gap-1.5"
+            >
+              <Lightbulb size={12} />
+              {isLoading ? (t('brainstorm.adding') || 'Adding...') : (t('brainstorm.addIdea') || 'Add idea')}
+            </button>
+          </div>
+        </form>
+      </DialogContent>
+    </Dialog>
+  )
+}