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/lib/redis.ts

@@ -0,0 +1,32 @@
+import Redis from 'ioredis';
+
+const globalForRedis = globalThis as unknown as { redis?: Redis };
+
+const redis =
+  globalForRedis.redis ??
+  new Redis({
+    host: process.env.REDIS_HOST ?? 'localhost',
+    port: parseInt(process.env.REDIS_PORT ?? '6379'),
+    password: process.env.REDIS_PASSWORD,
+    lazyConnect: true,
+    retryStrategy(times) {
+      if (times > 10) {
+        console.error('[redis] Max retries exceeded, will retry in 30s');
+        return 30000;
+      }
+      return Math.min(times * 200, 2000);
+    },
+    maxRetriesPerRequest: 3,
+  });
+
+redis.on('error', (err) => {
+  console.error('[redis] Connection error:', err.message);
+});
+
+redis.on('connect', () => {
+  console.log('[redis] Connected');
+});
+
+if (process.env.NODE_ENV !== 'production') globalForRedis.redis = redis;
+
+export { redis };