Give the dev container its own node_modules

npm installs the build tools' native binaries for the platform it runs
on, so a folder shared with the host only ever held Linux's or macOS's.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy

docker-compose.dev.yml

@@ -8,6 +8,9 @@ services:
       - "5173:5173"
     volumes:
       - .:/app
+      # Its own node_modules: npm installs the build tools' native binaries for Linux here and for
+      # the host's platform there, and a shared folder only ever holds one of them.
+      - /app/node_modules
     environment:
       APP_KEY: ${APP_KEY:-}
       APP_URL: http://localhost:8000