[Feature]: Replace polling with WebSocket-based state updates

[meryemefe]

Contact Details

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Describe the feature

Description:
Helios currently polls the server every 3 seconds to fetch environment state changes. Replace this with a WebSocket-based implementation to reduce unnecessary REST traffic and improve server resource usage.

Requirements:

• Implement WebSocket-based environment state updates
• Use RxDOM/RxJS integration on the frontend
• Stop periodic REST polling once WebSocket updates are available