Edit a scenario, run the Python simulation, and inspect the movement view in one local tool. The browser UI stays in one place while the backend handles validation and simulation.
No run yet.
1. Edit the scenario in the `Scenario` tab.
2. Click Run Simulation.
3. The page sends the current scenario JSON to /api/run.
4. The FastAPI backend validates it, runs the simulation, and returns flow JSON.
5. The `Results` tab updates automatically with the new playback data.