Expand MD061 footnote content coverage tests

[RobertoGongora]

Summary

• add dedicated MD061 regression tests covering blockquotes, code blocks, lists, tables, thematic breaks, and HTML inside footnotes
• document the new MD061 rule and MD046 footnote handling in the changelog and rule docs

Testing

• cargo fmt
• cargo test --test lib md061

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Codex Task

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Note

Adds MD061 to enforce 4-space indentation for footnote continuations (with autofix) and updates MD046 to ignore footnote bodies, plus docs and comprehensive tests.

• Rules:
  • MD061 (new): Enforces 4-space indentation for multi-line footnote continuations; provides automatic fixes (src/rules/md061_footnote_indentation.rs).
  • MD046: Skips legitimate footnote continuation lines when detecting indented code; uses new footnote context (src/rules/md046_code_block_style.rs).
• Utils:
  • Add mkdocs_footnotes::compute_footnote_context() to map footnote body lines (src/utils/mkdocs_footnotes.rs).
• Registration:
  • Register MD061 in rules module and factory (src/rules/mod.rs).
• Docs:
  • Changelog entry for MD061 and MD046 fix (CHANGELOG.md).
  • Add docs/md061.md; update docs/md046.md special cases; include MD061 in docs/RULES.md and rule count 55.
• Tests:
  • New suites for MD061 covering blockquotes, code, lists, tables, thematic breaks, HTML (tests/rules/md061_test.rs).
  • MD046 regression test to ensure footnotes aren’t mis-flagged (tests/rules/md046_test.rs).

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Bug: Footnote Indentation: Rule Misinterprets Definition Scope

MD061 incorrectly treats indented text containing [^id]: patterns as nested footnote definitions. When continuation text like Text mentioning [^2]: something appears within a footnote, the rule updates current_footnote state, causing subsequent properly-indented lines to be incorrectly flagged as violations. The is_footnote_definition regex matches [^id]: anywhere in indented lines, but only column-zero footnote definitions should reset the tracking state.