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Move the jobs list, details panel, folder filter, toolbar buttons, and all related helpers out of mainwindow.go into the new jobs_view.go. newMainView now calls newJobsView(w, svc) which returns a panel and a refresh closure; the subscriber and history wiring remain in mainwindow.go. showJobDialog lives in jobs_view.go as a temporary home until T4.3 extracts it to job_dialog.go. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>