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/package.json

@@ -24,7 +24,8 @@
     "test:unit:watch": "vitest watch",
     "test:unit:coverage": "vitest run --coverage",
     "test:migration": "vitest run tests/migration",
-    "test:migration:watch": "vitest watch tests/migration"
+    "test:migration:watch": "vitest watch tests/migration",
+    "locales:agent-slide-themes": "node scripts/localize-agent-slide-themes-and-translate.mjs"
   },
   "dependencies": {
     "@ai-sdk/anthropic": "^3.0.76",
@@ -49,6 +50,8 @@
     "@radix-ui/react-slot": "^1.2.4",
     "@radix-ui/react-switch": "^1.2.6",
     "@radix-ui/react-tooltip": "^1.2.8",
+    "@stripe/react-stripe-js": "^6.3.0",
+    "@stripe/stripe-js": "^9.5.0",
     "@tanstack/react-query": "^5.100.9",
     "@tiptap/extension-color": "^3.22.5",
     "@tiptap/extension-highlight": "^3.22.5",
@@ -85,6 +88,7 @@
     "diff": "^9.0.0",
     "dotenv": "^17.2.3",
     "elkjs": "^0.11.1",
+    "ioredis": "^5.10.1",
     "isomorphic-dompurify": "^3.12.0",
     "jalaali-js": "^1.2.8",
     "jsdom": "^29.0.2",
@@ -114,6 +118,7 @@
     "socket.io": "^4.8.3",
     "socket.io-client": "^4.8.3",
     "sonner": "^2.0.7",
+    "stripe": "^22.1.1",
     "tailwind-merge": "^3.4.0",
     "tinyld": "^1.3.4",
     "tippy.js": "^6.3.7",
@@ -127,6 +132,7 @@
     "@types/bcryptjs": "^2.4.6",
     "@types/dagre": "^0.7.54",
     "@types/diff": "^7.0.2",
+    "@types/ioredis": "^4.28.10",
     "@types/node": "^20",
     "@types/nodemailer": "^7.0.4",
     "@types/pdf-parse": "^1.1.5",