- Add errorMessage() utility for user-friendly toast messages
- Show toast on tailscale up/down/set/status failures
- Detect missing tailscale binary (exit code 127)
- Guard toggleTailscale and setExitNode when binary unavailable
- Show 'Tailscale not available' in popout when binary missing
QML's JS engine does not support ES module export/import syntax.
Replace bare export with a CommonJS guard that only runs under Node.js,
so the plugin loads in QML while tests still work.
- Extract peer parsing and exit-node command logic into lib.js
- Add ↗ button on peers that are ExitNodeOption candidates
- Highlight active exit node in primary color
- Add clear (×) button next to current exit node label
- Add unit tests for parsePeers and makeExitNodeCommand
