Address cast review feedback:
- Trim every cast to the in-app region (generate.mjs): the recording now
starts with the app already running and ends on the last in-app frame —
drops the `$ rdbms-playground` launch and the return-to-shell frame (the
latter was the stray cursor-under-$ artifact). Opt out per cast with
`keepShell: true` for demos that document the CLI launch.
- Landing quickstart cast: autoPlay + loop, with a 2.5s hold on the final
frame so it pauses before restarting.
- Cap the demo at max-width 46rem and centre it, so the player (fit:'width')
no longer scales its font up to the full splash column.
Casts re-recorded via `pnpm casts`. Build clean (25 pages).
Tab-keypress visibility deferred to an in-app overlay primitive (filed as
issue #22 — also serves the planned guided-lesson system); the cast notes
Tab in its caption for now.
claude@clouddev1
a8f84c9d17
