Replaced the YTSage title in README with an SVG wordmark and updated release format tables to use shield badges for Windows, Linux, and macOS. Added the ytsage-wordmark.svg asset and documented its location in the project structure.
Updated README.md to reference local screenshot files instead of external URLs. Renamed 'audio-only.png' to 'audio_format.png' and 'subtitles.png' to 'subtitle_options.png' for consistency with README references.
Added new screenshots for audio-only, main interface, playlist, and subtitles to the branding assets. These images can be used for documentation or promotional purposes.
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