fix: don't render headlines when they're at the end of a passage

[davidfedor]

No description provided.

[chatgpt-codex-connector]

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[github-actions]

LCOV of commit 540e945 during Unit Tests #109

	(use "lcov --ignore-errors deprecated,deprecated ..." to suppress this warning)
Reading tracefile /var/folders/9q/g6c4ln4s4jn0548xdb_06kjr0000gn/T/__zgosalvez_github-actions-report-lcov/lcov.info.
Summary coverage rate:
  source files: 71
  lines.......: 74.1% (5345 of 7214 lines)
  functions...: 64.7% (625 of 966 functions)
  branches....: no data found
Message summary:
  1 warning message:
    deprecated: 1

Files changed coverage rate: n/a