Table: Long text JSON cell hover overflow cannot be dismissed

To reproduce: - import this debug dashboard - click the first cell <details> <summary>Dashboard JSON</summary> ```json { "apiVersion": "dashboard.grafana.app/v2beta1", "kind": "Dashboard", "metadata": { "name": "ad7fss8", "namespace": "default", "uid": "yvTZJ7cjEu2oGedzCg8rPec501NRWFA5xX5VD1F4UsoX", "resourceVersion": "1", "generation": 1, "creationTimestamp": "2026-02-25T19:13:43Z", "labels": { "grafana.app/deprecatedInternalID": "1992" }, "annotations": { "grafana.app/createdBy": "user:eel75p7l7tiwwb", "grafana.app/updatedBy": "user:eel75p7l7tiwwb", "grafana.app/updatedTimestamp": "2026-02-25T19:13:43Z", "grafana.app/folder": "" } }, "spec": { "annotations": [ { "kind": "AnnotationQuery", "spec": { "query": { "kind": "DataQuery", "group": "grafana", "version": "v0", "datasource": { "name": "-- Grafana --" }, "spec": {} }, "enable": true, "hide": true, "iconColor": "rgba(0, 211, 255, 1)", "name": "Annotations & Alerts", "builtIn": true } } ], "cursorSync": "Off", "description": "", "editable": true, "elements": { "panel-1": { "kind": "Panel", "spec": { "id": 1, "title": "", "description": "", "links": [], "data": { "kind": "QueryGroup", "spec": { "queries": [ { "kind": "PanelQuery", "spec": { "query": { "kind": "DataQuery", "group": "grafana-testdata-datasource", "version": "v0", "datasource": { "name": "PD8C576611E62080A" }, "spec": { …