v1.0.1-beta.8

fix: remove space from DMG title to prevent ln failure on CI runner

'JPMixer 1.0.1-beta.X' mounts as /Volumes/JPMixer 1.0.1-beta.X/
which breaks the unquoted ln -s call in electron-builder's DMG builder.
Use hyphen separator instead.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>