fix: improve text contrast and accessibility across dashboard

[tylrx404]

Fixes #469

Summary

Improved text readability and accessibility across multiple dashboard sections by increasing contrast ratios for low-visibility labels, subtitles, sidebar text, and supporting UI elements.

Changes Made

• Increased opacity of muted gold labels.
• Improved contrast for section headings and stat descriptions.
• Enhanced readability of sidebar navigation text.
• Updated secondary text colors to improve visibility on dark backgrounds.

Result

• Better readability in low-light environments.
• Improved accessibility compliance.
• More consistent visual hierarchy across the dashboard.

Testing

• Verified UI appearance on dark theme.
• Confirmed improved visibility of sidebar labels, section headings, and stat descriptions.