[Xehanort88]

Summary

• Offer to trim after the loop end in interactive mode. After a loop is chosen, the export commands (tag, split-audio, extend, export-points) ask whether to losslessly trim the file after the loop end, and how many samples to keep (Enter = 100). The prompt only appears for formats that support lossless trimming (PCM/float WAV, FLAC, Ogg Vorbis), and not for trim itself.
  • With tag, a single copy is written that is both tagged and trimmed (name-tagged.ext), instead of separate tagged and trimmed files.
  • 100 samples (~2 ms at 44.1 kHz) is the default because some players/engines read slightly past the loop end (off-by-one or resampler lookahead).
  • Adds MusicLooper.supports_lossless_trim() and trim/keep_after options to MusicLooper.export_tags().
• Exit cleanly on Ctrl+C at the interactive prompt on Windows. Ctrl+C at an input() prompt can surface as EOFError, with the real interrupt arriving moments later. This printed an empty ERROR line followed by a KeyboardInterrupt traceback from sounddevice's PortAudio cleanup at exit. Both are now handled, and further Ctrl+C is ignored while exiting.

Testing

• uv run pytest: 105 passed, including new tests for the trim prompt (answers, invalid input, interrupts), the combined tag + trim output for FLAC and Ogg Vorbis, format support detection, and prompt skipping for unsupported formats and the trim command.
• Ran pymusiclooper -s -i tag ... --tag-names LOOPSTART LOOPLENGTH end to end on a generated WAV: one tagged file was written, cut at the expected sample.