Implement WebSocket manager

[2witstudios]

Epic 5: iOS App — Models & Networking — Issue 4/6

Source: Composite

Description

Observable WebSocket manager with auto-reconnect and keepalive.

Acceptance Criteria

• WebSocketManager as @Observable class
• URLSessionWebSocketTask for WebSocket connection
• Connection states: disconnected, connecting, connected, reconnecting(attempt: Int)
• Auto-reconnect with exponential backoff (1s, 2s, 4s, 8s, 16s, 30s max)
• Keepalive ping every 30s
• Proper task cancellation on disconnect
• Event parsing into typed Swift enums matching server events
• Terminal subscribe/unsubscribe/input commands

Files to Create

• ios/PPGMobile/PPGMobile/Networking/WebSocketManager.swift (new)