Initial release: collaborative trip planner

Multi-user trip planning web app in a single Docker container. Mullvad-style token accounts, trip sharing via join codes, day-by-day calendar with typed entries (activity, hotel, travel, flight, rental car, immigration, note), multi-leg flight segments with bundled IATA airport dataset, Leaflet/OSM map with per-leg great-circle km (air vs ground), rough km-driven vs rental included-km comparison, cost splitting with settle-up suggestions, flip-clock departure countdown. Node 20 + Express + SQLite (WAL, additive migrations), vanilla JS SPA, 44 API tests.

docker-compose.yml

@@ -0,0 +1,13 @@
+services:
+  tripplan:
+    build: .
+    ports:
+      - "3000:3000"
+    volumes:
+      # SQLite database persists on the host across container rebuilds.
+      - ./data:/app/data
+    environment:
+      # CHANGE THIS: set a long random string before exposing the app.
+      # e.g. `openssl rand -hex 32`
+      SESSION_SECRET: "change-me-to-a-long-random-secret"
+    restart: unless-stopped