Pauses MPRIS media players when recording starts so music
doesn't bleed into dictation. Adds the setting to the default
config for new installs and a migration for existing users.
Voxtype v0.4.9 adds a --no-post-install flag that suppresses the
"Next steps" instructions after downloading the model. Since Omarchy
handles systemd setup, hotkey configuration, and displays its own
success notification, these generic instructions are redundant and
potentially confusing to users.
The flag still shows download progress, just suppresses the
post-download instructions.
