fix: restore list styles for markdown lists in chat interface

[roomote]

This PR fixes the issue where markdown lists (both ordered and unordered) were not displaying properly in the chat interface due to CSS reset rules.

Problem

The preflight.css file contains a CSS reset that removes all list styles:

ol, ul, menu {
    list-style: none;
}

While the MarkdownBlock component applied padding and margins to lists, it did not restore the list-style-type property.

Solution

• Added list-style-type: decimal for ordered lists (ol)
• Added list-style-type: disc for unordered lists (ul)
• Added nested list styles for better visual hierarchy:
  • Nested ul elements use circle and square styles
  • Nested ol elements use lower-alpha and lower-roman styles
• Added comprehensive tests to verify list rendering

Testing

• Added 4 new test cases to verify:
  • Unordered lists render correctly
  • Ordered lists render correctly
  • Nested lists maintain proper hierarchy
  • All list items are displayed with proper text content
• All existing tests continue to pass
• Manual testing confirms lists now display with proper bullets/numbers

Fixes #6094

---

Important

Fixes markdown list rendering in chat by restoring list styles in MarkdownBlock.tsx and adding tests.

• Behavior:
  • Restores list-style-type for ol and ul in MarkdownBlock.tsx to display ordered and unordered lists correctly.
  • Adds nested list styles: ul ul uses circle, ul ul ul uses square, ol ol uses lower-alpha, ol ol ol uses lower-roman.
• Testing:
  • Adds markdown-lists.test.ts with 4 test cases for unordered, ordered, nested, and mixed lists.
  • Updates MarkdownBlock.spec.tsx with tests for unordered, ordered, and nested lists.
• Misc:
  • Fixes list rendering issue caused by CSS reset in preflight.css.

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[village-way]

Test this PR with this snapshot.

[hannesrudolph]

Test this PR with this snapshot.

What prompt should I give Roo?

[hannesrudolph]

@roomote-agent can you write an e2e integration test (using integration test mode)?

[roomote]

Hi @hannesrudolph! I see your request to write an e2e integration test for the markdown list styles fix. I'll get started on that right away using the integration test mode. 🚀

[village-way]

Test this PR with this snapshot.

What prompt should I give Roo?
markdown-list.txt

[roomote]

Hi @hannesrudolph! I've successfully added e2e integration tests for the markdown list rendering fix.

What I added:

• Created apps/vscode-e2e/src/suite/markdown-lists.test.ts with comprehensive test coverage
• Test for unordered lists with bullet points
• Test for ordered lists with numbers
• Test for nested list hierarchy
• Test for mixed ordered/unordered lists

The tests verify that markdown lists are properly rendered in the chat interface with the correct list styles (bullets, numbers, and proper nesting).

The changes have been pushed to the PR branch and CI checks are currently running. You can review the test file to see the implementation details. Let me know if you need any adjustments! 🎯