Refactor queue_methods.js to split applyPendingResolutions into
applyQueuedByKey (per-item) and applyPendingResolutionList (shared
implementation). Add an Apply button alongside the Remove button in
the selected resolution bar, wired to applyQueuedByKey with loading
state. Update CSS for .mr-selected-actions layout and .mr-btn-primary
styling in the detail pane.