Fix link accessibility

[VikasKSingh05]

Resolves #4126

Changes

Accessibility color updates

• Renamed p5-contrast-pink to p5-contrast-light-pink (#FFA9D9)
• Added a new p5-contrast-dark-pink color (#B20046)
• Updated existing references to use p5-contrast-light-pink

Theme-specific link colors

• Light theme links now use p5-contrast-dark-pink
• Dark theme links now use p5-contrast-light-pink
• Contrast theme links continue to use p5-contrast-light-pink

Link styling updates

• Updated shared link styling to use the theme-specific link-text-color variable instead of hardcoded color values
• Updated About page contact/footer links to use the accessibility-compliant theme link color
• Preserved existing hover and underline behavior

Why

This change improves link accessibility by ensuring link colors meet WCAG contrast requirements for small text while maintaining consistent behavior across themes.

QA Steps

1. Start the web editor locally.
2. Switch to Light Mode.
   • Verify links appear in dark pink (#B20046).
3. Switch to Dark Mode.
   • Verify links appear in light pink (#FFA9D9).
4. Switch to Contrast Mode.
   • Verify links appear in light pink (#FFA9D9).
5. Open the Preferences dialog and verify links use the correct theme color.
6. Open the About page and verify contact/footer links use the correct theme color.
7. Confirm links remain underlined and visually distinguishable from surrounding text in all themes.

Screenshots

Light Mode

Dark Mode