fix: harden run persistence and error surfacing from code review

Snapshot store paths under lock before async runs, roll back failed
start/save state, emit UI events only after successful persistence,
surface log write failures, and sync stale YAML docs to JSON.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/ui/settings_view.go

@@ -196,7 +196,7 @@ func settingsView(w fyne.Window, svc *app.Service) fyne.CanvasObject {
 		// gap between them instead of merging into one block.
 		container.NewVBox(
 			widget.NewLabelWithStyle("Storage", fyne.TextAlignLeading, fyne.TextStyle{Bold: true}),
-			settingsRow("Config YAML", widget.NewLabel(store.Paths.ConfigPath)),
+			settingsRow("Config JSON", widget.NewLabel(store.Paths.ConfigPath)),
 			settingsRow("Jobs directory", container.NewBorder(nil, nil, nil, jobsDirBrowse, jobsDir)),
 			settingsRow("Logs directory", container.NewBorder(nil, nil, nil, logsDirBrowse, logsDir)),
 			settingsRow("Max log files", maxLogFiles),