Toast moved out of copyToClipboard() into onExited (code===0 path).
Fallback clipboard rotation also present.
Issue #17 already addressed by existing implementation.
Fixes#17
Store _pendingToggleAction before starting toggleProcess.
Use it in onExited instead of live root.isConnected.
Prevents 'Failed to disconnect' when user actually clicked connect.
Fixes#14
parseStatusResult safely catches JSON errors (lib.js:68).
onStreamFinished performs no toasts.
All failure toasts centralized in statusCheck.onExited (TailscaleWidget.qml:103).
Eliminates historical double-toast spam described in #13.
Fixes#13