Directory.Build.props: Version 1.0.0 -> 1.2.0-beta.1 and Product TeamsISO ->
Dragon-ISO (missed in the rebrand sweep). CHANGELOG gains the 1.2.0-beta.1
entry (rational framerate end-to-end, audio FourCC fix, finder rebuild
hardening, scaler guard, installer fixes) and a backfilled 1.1.0 rebrand
entry.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
