fix(echarts): fix time shift color matching functionality

The "Match time shift color with original series" checkbox was not working
because time-shifted series names (e.g., "28 days ago") could not be properly
mapped back to their original series for color matching.

This fix adds logic to detect when a series name exactly matches a time
comparison value and finds the corresponding original series to use its
color key, ensuring time-shifted series use the same colors as their
original series when the checkbox is enabled.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: msyavuz

superset-frontend/plugins/plugin-chart-echarts/src/Timeseries/transformProps.ts

@@ -200,6 +200,7 @@ export default function transformProps(
     zoomable,
     stackDimension,
   }: EchartsTimeseriesFormData = { ...DEFAULT_FORM_DATA, ...formData };
+
   const refs: Refs = {};
   const groupBy = ensureIsArray(groupby);
   const labelMap: { [key: string]: string[] } = Object.entries(
@@ -301,7 +302,24 @@ export default function transformProps(
 
     const entryName = String(entry.name || '');
     const seriesName = inverted[entryName] || entryName;
-    const colorScaleKey = getOriginalSeries(seriesName, array);
+
+    let colorScaleKey = getOriginalSeries(seriesName, array);
+
+    // If this series name exactly matches a time compare value, it's a time-shifted series
+    // and we need to find the corresponding original series for color matching
+    if (array && array.includes(seriesName)) {
+      // Find the original series (first non-time-compare series)
+      const originalSeries = rawSeries.find(s => {
+        const sName = inverted[String(s.name || '')] || String(s.name || '');
+        return !array.includes(sName);
+      });
+      if (originalSeries) {
+        const originalSeriesName =
+          inverted[String(originalSeries.name || '')] ||
+          String(originalSeries.name || '');
+        colorScaleKey = getOriginalSeries(originalSeriesName, array);
+      }
+    }
 
     const transformedSeries = transformSeries(
       entry,