fix: brainstorm infinite loop, ghost cursor, embedding ::vector cast, semantic search, billing stats, usage meter accordion

- Fix useBrainstormSocket: stable guestId via useRef, remove setState in cleanup
- Fix GhostCursor: direct DOM manipulation via refs, no useState re-renders
- Fix all SQL embedding queries: add ::vector cast on text columns
- Fix embedding truncation to 15000 chars (under 8192 token limit)
- Fix NoteEmbedding INSERT: remove non-existent updatedAt column
- Fix billing page: show all quota stats in grid instead of single metric
- Fix usage meter: accordion expand/collapse, per-feature detail
- Fix semantic search: rebuild 103 note embeddings, ::vector cast on vectorSearch
- Fix brainstorm expand/manual-idea/create: ::vector cast on embedding SQL

memento-note/app/(main)/layout.tsx

@@ -7,7 +7,7 @@ import { detectUserLanguage, parseAcceptLanguage } from "@/lib/i18n/detect-user-
 import { loadTranslations } from "@/lib/i18n/load-translations";
 import { getAISettings } from "@/app/actions/ai-settings";
 import { AIChatLayoutBridge } from "@/components/ai-chat-layout-bridge";
-import { PageTransition } from "@/components/page-transition";
+
 
 export default async function MainLayout({
   children,
@@ -38,9 +38,7 @@ export default async function MainLayout({
         </Suspense>
 
         <main className="flex min-h-0 flex-1 flex-col overflow-y-auto scroll-smooth bg-memento-paper dark:bg-background">
-          <PageTransition>
-            {children}
-          </PageTransition>
+          {children}
         </main>
 
         {showAIAssistant && <AIChatLayoutBridge />}