fix(table-chart): fix cell bar visibility in dark theme (#35211)

Author: LevisNgigi

superset-frontend/plugins/plugin-chart-table/src/TableChart.tsx

@@ -170,12 +170,21 @@ function cellOffset({
 function cellBackground({
   value,
   colorPositiveNegative = false,
+  theme,
 }: {
   value: number;
   colorPositiveNegative: boolean;
+  theme: SupersetTheme;
 }) {
-  const r = colorPositiveNegative && value < 0 ? 150 : 0;
-  return `rgba(${r},0,0,0.2)`;
+  if (!colorPositiveNegative) {
+    return `${theme.colorFillSecondary}50`;
+  }
+
+  if (value < 0) {
+    return `${theme.colorError}50`;
+  }
+
+  return `${theme.colorSuccess}50`;
 }
 
 function SortIcon<D extends object>({ column }: { column: ColumnInstance<D> }) {
@@ -881,6 +890,7 @@ export default function TableChart<D extends DataRecord = DataRecord>(
                 background-color: ${cellBackground({
                   value: value as number,
                   colorPositiveNegative,
+                  theme,
                 })};
               `}
           `;
@@ -1089,6 +1099,7 @@ export default function TableChart<D extends DataRecord = DataRecord>(
       totals,
       columnColorFormatters,
       columnOrderToggle,
+      theme,
     ],
   );