v0.4.1

• Standing hints per project. Put them in .codebase-video/hints.md (terms, what to always skip, how to draw things); every agent gets them. Claude offers to save a hint there when it sounds permanent.
• The first frame is the title. The title card no longer fades in, so players that show the first frame as a thumbnail show the title.
• Kit: an edge can attach off-centre on a box side (fromPos, toPos), so two pairs of arrows can leave one box without colliding; a table cell can have its own time, so a number is not shown before it is spoken; a diagram now fades out at the same rate as text.
• A sheet with fewer than six stills no longer repeats its last still.