refactor: add socket factory seam under IRC transport

[louzt]

Summary

This PR opens a narrow transport seam under ObsidianIRC's existing socket layer without changing default behavior.

What changes

• keeps the current routing exactly as-is:
  • wss:// -> WebSocketWrapper
  • irc:// / ircs:// -> TCPSocket
• adds an injectable SocketFactory
• adds focused tests for:
  • custom factory injection
  • default websocket routing
  • default tauri TCP/TLS routing

Why

ObsidianIRC already has protocol selection, but the routing was still effectively hardcoded.
An injectable seam makes future transport experimentation and testing cleaner while preserving current behavior.

This mirrors the same direction already applied in the related tobby refactor, but fits ObsidianIRC's existing architecture where WebSocket support already exists.

Verification

• npm run format
• npm run fix:unsafe
• npm run test
• npm run build

Notes

The full test suite passes, though the repository already emits pre-existing jsdom/React test warnings around HTMLMediaElement.prototype.pause and some act(...) coverage in unrelated tests.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4c70c252-7c6e-4950-8aed-989823f34daf

📥 Commits

Reviewing files that changed from the base of the PR and between e7d7899 and e0d81ef.

📒 Files selected for processing (2)

• src/lib/socket.ts
• tests/lib/socketFactory.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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