Projects cast review fixes:
- Pace the confirms: `save as` name and `new` now type, pause, then Enter as
separate steps, so the viewer can read them before they execute.
- Insert `show tables` at each phase (before save / after `new` / after load),
since the schema sidebar is hidden at 90 cols (ADR-0046) — the sequence now
reads "books -> no tables -> books" so the round-trip is followable.
STYLE.md: new "Cast pacing & clarity" guidelines (beat-before-submit; surface
state where the sidebar would). Handoff item 2: chase these up across the
existing casts.