fix(theme): css vars color

[SoonIter]

Summary

fix(theme): css vars color

Related Issue

introduced in #2771

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR refactors the dark mode CSS by extracting a hardcoded color value into a CSS variable for better maintainability and consistency with the light mode implementation.

• Introduces a CSS variable --rp-home-hero-secondary-color in dark mode to match the light mode pattern
• Replaces hardcoded #a673ff with the new CSS variable reference in the gradient definition

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[github-actions]

Rsdoctor Bundle Diff Analysis

📁 web

Path: website/doc_build/web/rsdoctor-data.json

Metric	Current	Baseline	Change
📊 Total Size	14.3 MB	14.3 MB	-8.3 KB (-0.1%)
📄 JavaScript	13.7 MB	13.8 MB	-8.3 KB (-0.1%)
🎨 CSS	109.6 KB	109.5 KB	66.0 B (0.1%)
🌐 HTML	0 B	0 B	N/A
📁 Other Assets	497.3 KB	497.3 KB	0 B (0.0%)

📦 Download Diff Report: web Bundle Diff

Generated by Rsdoctor GitHub Action