Polish instant fix cards and validation messages (#93894)
### What?
- Rename cards to plain English: `Prerender params if known`, `Mark the
route as dynamic`, `For telemetry, use a timing API`.
- Remove `Wrap body in Suspense` card from viewport variants.
- Body errors: `during the initial render` → `during prerendering`;
`blocking navigation` → `blocking the page load`.
- Server sync IO leads with `the unstable value <expression>`.
- Client sync IO drops `fixed at build time`.
- New loading-state icon for the `block` group.
### Demo
- [Fix
Overview](https://error-messages-overhaul-ibsl.labs.vercel.dev/fix-overview)
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Co-authored-by: Cursor <cursoragent@cursor.com>
