feat: design system overhaul — sidebar, AI chats, settings, brainstorm, color cleanup

- Sidebar: dynamic brand-accent colors, brainstorm section restyled
- AI chat general: popup panel with expand/collapse, hides when contextual AI open
- AI chat contextual: tabs reordered (Actions first), X close button, height fix
- Settings: all tabs restyled, 6 new color presets (sage, terracotta, iron, etc.)
- Global color cleanup: emerald/orange hardcoded → brand-accent dynamic
- Brainstorm page: orange → brand-accent throughout
- PageEntry animation component added to key pages
- Floating AI button: bg-brand-accent instead of hardcoded black
- i18n: all 15 locales updated with new AI/billing keys
- Billing: freemium quota tracking, BYOK, stripe subscription scaffolding
- Admin: integrated into new design
- AGENTS.md + CLAUDE.md project rules added

memento-note/components/archive-client.tsx

@@ -1,6 +1,7 @@
 'use client'
 
 import { useState, useCallback } from 'react'
+import { PageEntry } from '@/components/page-entry'
 import dynamic from 'next/dynamic'
 import type { Note } from '@/lib/types'
 import { NotesEditorialView } from '@/components/notes-editorial-view'
@@ -40,9 +41,11 @@ export function ArchiveClient({ notes }: ArchiveClientProps) {
   }
 
   return (
+    <PageEntry>
     <NotesEditorialView
       notes={notes}
       onOpen={handleOpen}
     />
+    </PageEntry>
   )
 }