enhancement: code snippet colors should depend on native theme

[urmauur]

Describe Your Changes

This pull request includes several changes to the theme configurations and styles for code blocks, as well as updates to the MarkdownTextMessage component to improve consistency and appearance.

Theme Configuration Updates:

• Removed the code-block color definition from multiple theme files, including dark-dimmed, joi-dark, joi-light, and night-blue (themes/dark-dimmed/theme.json [1] themes/joi-dark/theme.json [2] themes/joi-light/theme.json [3] themes/night-blue/theme.json [4].

Component Style Updates:

• Updated the MarkdownTextMessage component to use hsla(var(--app-code-block)) and hsla(var(--text-primary)) for better theme consistency (web/screens/Thread/ThreadCenterPanel/TextMessage/MarkdownTextMessage.tsx [1] [2] [3] [4].

Code Block Style Improvements:

• Added !important to various color definitions in code-block.scss to ensure they are applied correctly (web/styles/components/code-block.scss [1] [2] [3] [4] [5].
• Commented out an unnecessary color definition in code-block.scss (web/styles/components/code-block.scss web/styles/components/code-block.scssL162-R171).

Main Style Updates:

• Added and updated CSS variables for app-code-block and various highlight colors in main.scss (web/styles/main.scss [1] [2].

Fixes Issues

• Closes enhancement: Code snippets should follow global theme settings #4219
• Closes #

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

[github-actions]

Barecheck - Code coverage report

Total: 67.61%

Your code coverage diff: 0.00% ▴

Uncovered files and lines

File	Lines
web/screens/Thread/ThreadCenterPanel/TextMessage/MarkdownTextMessage.tsx	32, 36-37, 41, 49-52, 54, 58, 65-67, 73, 76-78, 80, 85-86, 89, 140, 142-143, 148-149, 208, 223

[github-actions]

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