fix(#63): indentation in nested mkdocs elements

[KyleKing]

Previously, nested lists within definition bodies were using 2-space increments instead of the expected 4-space increments. This was caused by the normalize_list function skipping processing for any list with level > 1, which incorrectly excluded lists inside definition bodies.

The fix accounts for definition body context by checking context.env["indent_width"] to determine the expected level for top-level lists in the current context. Each definition body adds 2 to the token level and 4 to indent_width, so we calculate the expected top-level and only skip nested lists relative to that level.

This ensures that:

• Lists in definition bodies maintain 4-space indentation
• Nested lists within those lists also use 4-space increments
• The behavior is consistent with mdformat-mkdocs' 4-space convention

Fixes #63
Related to #58 (partial fix)

---

Note

Ensure nested lists within definition bodies use 4-space increments by determining top-level via context indent width; update expectations and add regression test.

• Formatter:
  • Update normalize_list to compute expected top-level from context.env["indent_width"] (def bodies add 2 levels / 4 spaces) and only skip lists deeper than that, ensuring 4-space increments for lists inside definition bodies.
• Tests:
  • Adjust DEF_LIST_WITH_NESTED_WRAP_EXPECTED in tests/format/test_wrap.py to match corrected indentation.
  • Add test_definition_list_nested_indentation to validate 4-space increments for nested lists in definition bodies (including 4/8/12-space checks).

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