Add colors for weekly downloads sparkline in dark mode (#8291)

Author: szakarias

pkg/web_app/lib/src/widget/weekly_sparkline/widget.dart

@@ -89,11 +89,6 @@ void drawChart(Element svg, HTMLDivElement toolTip, HTMLDivElement chartSubText,
 
   chartSubText.text = '${formatDate(firstDay)} - ${formatDate(lastDate)}';
   final chart = SVGGElement();
-  final frame = SVGRectElement();
-  frame.setAttribute('height', '$height');
-  frame.setAttribute('width', '$width');
-  frame.setAttribute('style', 'fill:white;stroke-width:1;stroke:white');
-  chart.append(frame);
 
   final sparklineBar = SVGLineElement();
   final sparklineCursor = SVGGElement();

pkg/web_css/lib/src/_detail_page.scss

@@ -255,7 +255,7 @@ $detail-tabs-tablet-width: calc(100% - 240px);
   margin: 0px;
   padding: 2px 8px;
   box-shadow: rgba(0, 0, 0, 0.1) 0px 4px 12px;
-  color: var(--pub-color-white);
+  color: var(--pub-weekly-chart-tooltip-text-color);
   background-color: var(--pub-weekly-chart-main-color);
   opacity: 1;
   z-index: 100000;

pkg/web_css/lib/src/_variables.scss

@@ -56,7 +56,8 @@
   --pub-detail_tab-text-color: var(--pub-neutral-textColor);
   --pub-detail_tab-underline-color: #dddddd;
   --pub-detail_tab-active-color: #1967d2;
-  --pub-weekly-chart-main-color: #0175c2;
+  --pub-weekly-chart-main-color: var(--pub-link-text-color);
+  --pub-weekly-chart-tooltip-text-color: var(--pub-color-white);
   --pub-detail_tab-admin-color: #990000;
   --pub-hash_link-text-color: #ccc;
   --pub-footer-background-color: #27323a;
@@ -144,6 +145,8 @@
   --pub-detail_tab-active-color: color-mix(in srgb, var(--pub-link-text-color), var(--pub-inset-bgColor) 20%);
   --pub-detail_tab-admin-color: #e03030;
   --pub-home_title-text-color: #31b0fc;
+  --pub-weekly-chart-main-color: var(--pub-link-text-color);
+  --pub-weekly-chart-tooltip-text-color: var(--pub-color-anchorBlack);
   --pub-home_card-box_shadow-color: rgba(255, 255, 255, 0.2);
   --pub-home_card_title-text-color: var(--pub-home_title-text-color);
   --pub-home_card_hover-box_shadow-color: rgba(255, 255, 255, 0.3);