SingleFile CLI 2.15.4

Changes

• single-file-core is updated to 1.6.9, see https://github.com/gildas-lormeau/single-file-core/releases/tag/v1.6.9. For the CLI it means that a rule the capturing browser rejects, because one selector of its list is unsupported there, no longer hides a rule that browser actually draws: with --browser-engine firefox the lists of a shared Gemini conversation kept their indent, where they used to fall back to the browser default

Co-authored by Claude (Claude Code)