add stroke in text label (#23788)

Co-authored-by: gitstart <gitstart@users.noreply.github.com>

frontend/src/metabase/css/dashboard.css

@@ -59,6 +59,7 @@
 
 .Dashboard.Dashboard--night .DashCard .Card svg text {
   fill: color-mod(var(--color-text-white) alpha(-14%)) !important;
+  stroke: none !important;
 }
 
 .Dashboard.Dashboard--night .DashCard .Card {

frontend/src/metabase/public/components/EmbedFrame.css

@@ -27,6 +27,7 @@
 
 .Theme--night.EmbedFrame svg text {
   fill: color-mod(var(--color-text-white) alpha(-14%)) !important;
+  stroke: none !important;
 }
 
 .Theme--night.EmbedFrame .DashCard .Card {

frontend/src/metabase/visualizations/components/LineAreaBarChart.css

@@ -237,11 +237,17 @@ text.value-label {
   font-size: 12px;
   font-weight: 800;
   letter-spacing: 0.5px;
+  stroke: var(--color-text-white);
+  stroke-width: 3px;
+  paint-order: stroke;
 }
 
 text.value-label-white {
   fill: var(--color-text-white);
   font-weight: 800;
+  stroke: var(--color-text-dark);
+  stroke-width: 3px;
+  paint-order: stroke;
 }
 
 /* timeline events */