feat(shared): polish missing/invalid key error copy

[eatmorespinach]

Description

Copy-only follow-up to #9491. Three tweaks to the missing/invalid key error messages (all 4 variants: missing publishable key, missing secret key, invalid publishable key, and the fatal key-parse guidance):

• Remove the two-space indent before the npx clerk@latest init command. The indent is a terminal code-block convention, but in the Next.js dev error overlay — where most new users hit this message — it renders as a stray leading space.
• Start the follow-up sentence with the command name: "npx clerk@latest init creates a Clerk application..." instead of "It creates...", so the sentence stands on its own.
• Reword "Requires no Clerk account or login..." to "No Clerk account or login required...".

No behavior changes. Test assertions in shared, backend, and nextjs updated to match.

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: 08113e1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 23 packages

Name	Type
@clerk/shared	Patch
@clerk/astro	Patch
@clerk/backend	Patch
@clerk/chrome-extension	Patch
@clerk/clerk-js	Patch
@clerk/electron	Patch
@clerk/expo-passkeys	Patch
@clerk/expo	Patch
@clerk/express	Patch
@clerk/fastify	Patch
@clerk/headless	Patch
@clerk/hono	Patch
@clerk/localizations	Patch
@clerk/msw	Patch
@clerk/nextjs	Patch
@clerk/nuxt	Patch
@clerk/react-router	Patch
@clerk/react	Patch
@clerk/tanstack-react-start	Patch
@clerk/testing	Patch
@clerk/ui	Patch
@clerk/vue	Patch
@clerk/swingset	Patch

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview	Aug 23, 2026 10:04pm
swingset	Ready	Preview	Aug 23, 2026 10:04pm

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commit: 08113e1