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/history_view.go

@@ -29,7 +29,7 @@ func newEvent(jobID int, jobName string, state string, detail string) event {
 func collectActivity(jobs []job, runtimes map[int]*domain.JobRuntime) []event {
 	var events []event
 	for _, current := range jobs {
-		// At startup this is usually empty because jobs.yaml does not persist
+		// At startup this is usually empty because jobs.json does not persist
 		// runtime logs. The function still centralizes the merge for future
 		// history loading from log metadata.
 		if rt := runtimes[current.ID]; rt != nil {

src/ui/mainwindow.go

@@ -43,8 +43,8 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 	history, refreshHistory := newHistoryView(&events)
 	recordStartup := func(duration time.Duration, windowShown bool) {
 		// Startup is recorded as an in-memory History event instead of being
-		// persisted into jobs.yaml. It is session diagnostics, not durable job
-		// state, and keeping it ephemeral avoids polluting the human-editable YAML
+		// persisted into jobs.json. It is session diagnostics, not durable job
+		// state, and keeping it ephemeral avoids polluting the human-editable JSON
 		// file with process-lifetime bookkeeping.
 		detail := "Window shown in " + duration.Round(time.Millisecond).String()
 		if !windowShown {

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),