ui/app: per-job overlap policy in job dialog and details panel

- job_dialog.go: add overlap-policy widget.Select with "(Use global
  default)" → empty, "skip", and "queue" options; pre-selects the job's
  current value; on save maps the inherit label back to empty string.
- app/format.go: add DisplayOverlapPolicy(job, globalPolicy) — returns
  the policy name when overridden, else "skip/queue (global default)".
- ui/jobs_view.go: add "Overlap policy" detail row updated in
  updateDetails using DisplayOverlapPolicy.
- settings_view.go: rename "Overlap policy" label to "Default overlap
  policy" to clarify it is the global default jobs can override.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ui/job_dialog.go

@@ -13,6 +13,10 @@ import (
 	"fyne.io/fyne/v2/widget"
 )
 
+// overlapPolicyInherit is the display label used when a job should inherit the
+// global overlap policy. It maps to an empty Job.OverlapPolicy on save.
+const overlapPolicyInherit = "(Use global default)"
+
 // showJobDialog opens a create/edit form for a single job. onSave is called
 // with the populated job only when the user clicks Save and all fields pass
 // validation.
@@ -40,6 +44,15 @@ func showJobDialog(w fyne.Window, title string, current job, onSave func(job)) {
 	startOnly.SetChecked(current.StartOnly)
 	enabled := widget.NewCheck("Enabled", nil)
 	enabled.SetChecked(current.Enabled)
+	overlapSelect := widget.NewSelect(
+		[]string{overlapPolicyInherit, string(domain.OverlapPolicySkip), string(domain.OverlapPolicyQueue)},
+		nil,
+	)
+	overlapSelected := overlapPolicyInherit
+	if current.OverlapPolicy != "" {
+		overlapSelected = current.OverlapPolicy
+	}
+	overlapSelect.SetSelected(overlapSelected)
 
 	form := dialog.NewForm(
 		title,
@@ -52,6 +65,7 @@ func showJobDialog(w fyne.Window, title string, current job, onSave func(job)) {
 			widget.NewFormItem("Command", commandRow),
 			widget.NewFormItem("Arguments", argumentsEntry),
 			widget.NewFormItem("", startOnly),
+			widget.NewFormItem("Overlap policy", overlapSelect),
 			widget.NewFormItem("", enabled),
 		},
 		func(saved bool) {
@@ -75,6 +89,10 @@ func showJobDialog(w fyne.Window, title string, current job, onSave func(job)) {
 			current.Arguments = strings.TrimSpace(argumentsEntry.Text)
 			current.StartOnly = startOnly.Checked
 			current.Enabled = enabled.Checked
+			current.OverlapPolicy = overlapSelect.Selected
+			if current.OverlapPolicy == overlapPolicyInherit {
+				current.OverlapPolicy = ""
+			}
 			// The dialog only edits durable configuration. Runtime status is
 			// initialized (new jobs) or updated (edits) by the caller against the
 			// runtime map, keyed by job ID.