0.34.2 - Forced Character Marker Hidden in Render

• Fix: Forced character cues (@KOOL-AID MAN, @McDonald) no longer render the literal @ in the preview, PDF, or the rehearsal/completion/removal character lists. The @ is a parser-only hint per the Fountain spec; it now lives on a separate Dialogue.forcedMarkerRange (mirroring caretRange) while characterRange covers just the name, so every consumer that slices characterRange gets the displayable name for free. Reported in #31.