feat(website): pace the projects cast + show table state; record cast guidelines

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.

docs/handoff/20260611-website-handoff-2.md

@@ -130,6 +130,16 @@ output blocks** (capture-harness recipe below).
 
 ### 2. Consider a final cast re-record sweep + optional captions
 - All casts re-record with `pnpm casts` once the app is "final".
+- **Chase up two pacing/clarity guidelines across the existing casts** (added
+  to STYLE.md "Cast pacing & clarity" 2026-06-11; the projects cast already
+  follows them):
+  1. **Don't submit a command too fast** — a typed-and-`Enter`ed-in-one-instant
+     command vanishes before the viewer reads it. Re-review each cast for
+     type-then-instant-Enter (especially modal confirms / short commands) and
+     add a pause before `Enter` (split `type` and `key:'Enter'` steps).
+  2. **Show state where the sidebar would** — at 90 cols the schema sidebar is
+     hidden (ADR-0046), so insert `show tables` / `show table` / `show data`
+     where state changes, so the viewer can follow what happened.
 - **Review whether caption banners would improve the existing casts.** The
   demo overlay can show a neutral step **caption** (the stealth `Ctrl+]`
   banner) to label or narrate a moment — e.g. marking the phases of the