Coastal Timesheet v2 — full feature buildout

Features:
- Copy Previous Week (entries duplication)
- Bulk Approve/Reject (admin workflow)
- Overtime tracking (employee + admin views)
- DayCard component with auto-save
- PDF generation, email notifications
- React + Tailwind frontend, Prisma + PostgreSQL backend
- Docker deployment (3 containers)

frontend/postcss.config.js

@@ -0,0 +1,6 @@
+export default {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+};