fix(chartCopyButton) : tooltip arrow visibility in dark mode for chart copy button

[Hamed-Ajaj]

Description

Fixes the tooltip arrow color mismatch in dark mode for the chart copy button.

Problem

The ChartCopyButton component was using hardcoded colors (bg-black text-white) for the tooltip, which caused the tooltip arrow to not display correctly in dark mode. The arrow uses theme-aware colors (bg-foreground), but the content was hardcoded to black, creating a visual mismatch.

Solution

Removed the hardcoded className="bg-black text-white" from TooltipContent to allow it to use the default theme-aware styling. Now both the tooltip content and arrow use consistent colors that adapt to the current theme.

Before

• Light mode: Works (black tooltip + black arrow)
• Dark mode: Broken (black tooltip + white arrow - invisible/mismatched)

After

• Light mode: Works (dark tooltip + dark arrow)
• Dark mode: Works (light tooltip + light arrow)

Related Issue

Closes #8988

Checklist

• [x] I've made research efforts and searched the documentation
• [x] I've searched for existing issues
• [x] The code follows the project's style guidelines
• [x] I have tested this in both light and dark mode

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