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/label-badge.tsx

@@ -37,12 +37,12 @@ export function LabelBadge({
         isSelected
           ? 'bg-foreground text-background border-foreground shadow-sm'
           : isAI
-            ? 'bg-[#75B2D6]/10 border-[#75B2D6]/25 text-[#75B2D6]'
+            ? 'bg-[#A47148]/10 border-[#A47148]/25 text-[#A47148]'
             : 'bg-[#8D8D8D]/10 border-[#8D8D8D]/25 text-[#8D8D8D]',
       )}
     >
       {isAI && (
-        <Sparkles size={8} className="text-[#75B2D6]/70" />
+        <Sparkles size={8} className="text-[#A47148]/70" />
       )}
       <span className="truncate">{label}</span>
       {onRemove && (
@@ -66,8 +66,8 @@ export function LabelBadge({
       )}
       {isAI && !isSelected && (
         <span className="relative flex h-1.5 w-1.5">
-          <span className="animate-ping absolute inline-flex h-full w-full rounded-full bg-[#75B2D6] opacity-75" />
-          <span className="relative inline-flex rounded-full h-1.5 w-1.5 bg-[#75B2D6]" />
+          <span className="animate-ping absolute inline-flex h-full w-full rounded-full bg-[#A47148] opacity-75" />
+          <span className="relative inline-flex rounded-full h-1.5 w-1.5 bg-[#A47148]" />
         </span>
       )}
     </button>