style: Improve prose styling and add test IDs

[jordanpartridge]

Summary

• Enhances markdown rendering with comprehensive prose styles
• Adds data-testid attributes for browser testing

Changes

• Add comprehensive prose styling for markdown content:
  • Headings (h1-h4) with proper sizing and spacing
  • Paragraphs with appropriate margins
  • Lists (ul/ol) with proper indentation and markers
  • Blockquotes with left border and italic styling
  • Links with underline and hover states
  • Bold and italic text styles
• Improve code block styling in dark theme
• Add data-testid attributes to ChatMessage component:
  • user-message / assistant-message on message container
  • message-content on content wrapper
  • plain-text-content / markdown-content on content divs

Test Plan

• Visual inspection of markdown rendering
• Verify test IDs work with Pest browser tests

[jordanpartridge]

Quality Gate: error

All quality checks passed.

Quality Check Results

All tools passed without violations.

[jordanpartridge]

Quality Gate: error

The repository "the-shit/chat" does not have any tool violations as per the provided data.

The analysis of the repository "the-shit/chat" using multiple code quality tools (pint, pest, phpstan, and rector) did not uncover any violations. Each tool specifically designed to check different aspects of PHP code quality, such as syntax, static analysis, refactoring suggestions, and more, reported no issues. This indicates that the codebase is clean and adheres well to best practices as far as these tools are concerned. However, it's important to note that this does not guarantee flawless code; other types of errors or style inconsistencies might still exist that these specific tools do not cover.

[jordanpartridge]

Closing. Open longer than a month.