Switch to WebSocketSecure, add error UI, add HTTP error handling

[StarbirdTech]

Fixes #11

This resolves the silent crash when selecting a channel by switching from ws:// to wss:// and adding error handling to http requests for slash commands which is another possible source of silent crashes I noticed.

Changes

1. Switch from WS to WSS

• Changed from ws://irc-ws.chat.twitch.tv:80 to wss://irc-ws.chat.twitch.tv:443
• The ws:// connection was causing "websocket: bad handshake" errors, Twitch seems to want TLS

2. Add error handling to HTTP requests

• Added nil checks in fireRequest() for slash commands like /ban, /info, etc.

3. Add error UI for WebSocket connection failures

• Added connectionError field to ChatModel to track connection state
• Displays an error message with troubleshooting guidance
• Shows debug log location for additional details
• Press Esc to return to channel selection instead of the app exiting

Testing

macOS Tahoe v26.0.1

Built and tested with ws:// and confirmed error ui displays and functions correctly.
Built and tested with wss:// and confirmed bad handshake is resolved