Stat: Numbers size computation broken

### What happened? <img width="152" height="74" alt="Image" src="https://github.com/user-attachments/assets/5cddfe4a-e981-4f21-99cf-dfa03b5dcd3e" /> ### What did you expect to happen? Value size should be bigger ### Did this work before? Yes, ~autumn 2025 ### How do we reproduce it? ``` { "kind": "Panel", "spec": { "id": 20, "title": "New panel", "description": "", "links": [], "data": { "kind": "QueryGroup", "spec": { "queries": [ { "kind": "PanelQuery", "spec": { "query": { "kind": "DataQuery", "version": "v0", "group": "grafana-testdata-datasource", "datasource": { "name": "PD8C576611E62080A" }, "spec": { "scenarioId": "random_walk", "seriesCount": 1 } }, "refId": "A", "hidden": false } } ], "transformations": [], "queryOptions": {} } }, "vizConfig": { "kind": "VizConfig", "group": "stat", "version": "13.0.0-22843068776", "spec": { "options": { "reduceOptions": { "values": false, "calcs": [ "lastNotNull" ], "fields": "" }, "orientation": "auto", "textMode": "auto", "wideLayout": true, "colorMode": "value", "graphMode": "none", "justifyMode": "auto", "showPercentChange": false, "percentChangeColorMode": "standard" }, "fieldConfig": { "defaults": { "thresholds": { "mode": "absolute", "steps": [ { "value": null, "color": "green" }, { "value": 80, …