feat: Add connection resilience with auto-reconnect and heartbeat

[PhilipLudington]

• Add UnityConnection class with exponential backoff reconnection
• Add ConnectionState enum (Disconnected, Connecting, Connected, Reconnecting)
• Add heartbeat/ping-pong mechanism to detect stale connections
• Emit connection state change events for UI feedback
• Refactor McpUnity to use new UnityConnection class
• Add Jest test suite with 14 tests for connection handling

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[CoderGamester]

@PhilipLudington is this PR still valid or can it be deleted?

[PhilipLudington]

Yeah, sorry, I confused myself I guess.

[PhilipLudington]

Okay, I figured it out. I was behind on a few commits, but thought I was up to date. This is ready for review now.