fix(ui): place cleanup opt-out below dialog actions

Extract the cleanup confirmation into a reusable production component, align its action group to the right, and place the opt-out directly below the buttons. Add an isolated visual fixture so the exact dialog can be reviewed without touching real queue data.

src/renderer/views/downloads/DeleteConfirmationDialog.tsx

@@ -0,0 +1,37 @@
+import type { ReactElement } from "react";
+import { Dialog } from "../../ui/Dialog";
+
+interface DeleteConfirmationDialogProps {
+  dontAsk: boolean;
+  parts: string[];
+  totalRemaining: number;
+  onCancel: () => void;
+  onConfirm: () => void;
+  onDontAskChange: (checked: boolean) => void;
+}
+
+export function DeleteConfirmationDialog({
+  dontAsk,
+  parts,
+  totalRemaining,
+  onCancel,
+  onConfirm,
+  onDontAskChange
+}: DeleteConfirmationDialogProps): ReactElement {
+  return (
+    <Dialog actions={null} danger onClose={onCancel} open title="Bist Du Dir sicher?">
+      <p>Möchtest Du wirklich diese Aufräumaktion(en) durchführen?<br />Ausgewählte Links löschen</p>
+      <p><strong>Zu erledigende Aufgaben:</strong><br />{parts.join(" + ")} löschen ? {totalRemaining} Link(s) verbleiben!</p>
+      <div className="delete-confirm-footer">
+        <div className="modal-actions">
+          <button className="btn" onClick={onCancel}>Abbrechen</button>
+          <button className="btn danger" onClick={onConfirm}>Fortfahren</button>
+        </div>
+        <label className="toggle-line delete-confirm-dont-ask">
+          <input type="checkbox" checked={dontAsk} onChange={(event) => onDontAskChange(event.target.checked)} />
+          Nicht mehr anzeigen
+        </label>
+      </div>
+    </Dialog>
+  );
+}