Initial Visiontr frontend: Vite + React + Cesium globe with OpenSky integration

[TarunT27]

Motivation

• Provide an initial frontend scaffold for the Visiontr project to visualize live aircraft on a 3D globe using Cesium and React and to fetch flight states from the OpenSky API.
• Enable a fast development experience via Vite and include necessary dependencies and build configuration.

Description

• Add project configuration and dependencies: package.json, package-lock.json, .gitignore, and vite.config.ts with @vitejs/plugin-react-swc and vite-plugin-cesium configured.
• Create minimal app entry (index.html, src/main.tsx, src/App.tsx) and a Globe component (src/components/Globe.tsx) that instantiates a Cesium Viewer, renders aircraft Entity models with sampled positions and paths, supports tracking, a night-vision post-process stage, and UI controls for toggling night vision and releasing the camera.
• Implement flight data handling in src/hooks/useFlightData.ts which polls OpenSky states/all and maps API states to typed FlightState objects for rendering.
• Implement src/services/OpenSkyService.ts that requests and caches an OpenSky client-credentials token, handles token lifetime and concurrent requests, and surfaces getAccessToken() for the hook; API credentials are read from environment variables (VITE_OPENSKY_CLIENT_ID, VITE_OPENSKY_CLIENT_SECRET) and Cesium Ion token from VITE_CESIUM_ION_ACCESS_TOKEN.

Testing

• No automated tests were added or run for this change.

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Codex Task