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Adds a polished GitHub Pages-ready site in docs/, expands import support to MP3, Opus, CAF, W64/RF64, FLAC, OGG, AIFF, and WAV via centralized format handling, updates GUI/CLI docs, and includes a refreshed portable Windows build. Tests: 23/23 passing, including MP3 load verification. Note: publishing the Pages site requires the repo to be public or a GitHub plan that supports Pages for private repositories.