codeant-ai-for-open-source[bot] commented on PR #38086:
URL: https://github.com/apache/superset/pull/38086#issuecomment-3924701482
## **Sequence Diagram**
The PR changes the ExploreChartPanel styling to darken the vertical split
line by mixing the theme color with black, improving discoverability of the
draggable gutter. The diagram shows the high-level render flow from page to
resulting darker split visible to the user.
```mermaid
sequenceDiagram
participant User
participant Browser
participant ExploreChartPanel
participant Theme
User->>Browser: Open Charts (Explore) page
Browser->>ExploreChartPanel: Render panel component
ExploreChartPanel->>Theme: Read theme.colorSplit
ExploreChartPanel->>ExploreChartPanel: Apply CSS:
color-mix(theme.colorSplit, black 15%) for .gutter borders
ExploreChartPanel-->>Browser: Render darker vertical split gutter
Browser-->>User: Display more visible split for resizing
```
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