Visualization: Time Series: Bar alignment does not move values

### What happened? In the Time Series visualization, using bar alignment combined with "show values", the values don't stay with the center of the bar. <img width="513" height="568" alt="Image" src="https://github.com/user-attachments/assets/6e593adb-0525-4ae8-b61d-8a2ac34c7f26" /> ### What did you expect to happen? The value label should move with the bar alignment and stay centered on the bar. ### Did this work before? I don't know. ### How do we reproduce it? 1. Visualization: Time Series 2. Graph Style: Bars 3. Bar alignment: either offset alignment ### Is the bug inside a dashboard panel? | Key | Value | |--|--| | Panel | timeseries @ 12.2.0 | | Grafana | Grafana v12.2.0 (92f1fba9b4) // Open Source | <details><summary>Panel debug snapshot dashboard</summary> ```json { "panels": [ { "id": 2, "type": "timeseries", "title": "Reproduced with embedded data", "gridPos": { "h": 13, "w": 15, "x": 0, "y": 0 }, "fieldConfig": { "defaults": { "custom": { "drawStyle": "bars", "lineInterpolation": "linear", "barAlignment": 1, "barWidthFactor": 1, "lineWidth": 1, "fillOpacity": 49, "gradientMode": "none", "spanNulls": false, "insertNulls": false, "showPoints": "always", "showValues": true, "pointSize": 1, "stacking": { "mode": "none", "group": "A" }, "axisPlacement": "auto", "axisLabel": "", "axisColorMode": "text", "axisBorderShow": false, "scaleDistribution": { "type": "linear" }, "axisCenteredZero": false, "hideFrom": { "tooltip": false, "viz": false, "legend": false }, "thresholdsStyle": { "mode": "off…