Build AI Chief of Staff MVP: auth, mailbox sync, briefings, draft replies

Scaffolds a Next.js app with email/password auth, encrypted IMAP/SMTP/CalDAV
mailbox connections, a background sync job, Claude-generated daily briefings,
and an approve-before-send draft reply flow. Includes a clean design system
(light/dark) and deployment config (systemd unit, credential rotation script).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012o9j9RezxbZVKQMrB7oRLY

src/lib/db/client.ts

@@ -0,0 +1,15 @@
+import Database from "better-sqlite3";
+import { drizzle } from "drizzle-orm/better-sqlite3";
+import path from "node:path";
+import fs from "node:fs";
+import * as schema from "./schema";
+
+const dataDir = process.env.DATA_DIR ?? path.join(process.cwd(), "data");
+fs.mkdirSync(dataDir, { recursive: true });
+
+const sqlite = new Database(path.join(dataDir, "db.sqlite"));
+sqlite.pragma("journal_mode = WAL");
+sqlite.pragma("foreign_keys = ON");
+
+export const db = drizzle(sqlite, { schema });
+export type DB = typeof db;