Fix (code): fallbackLocale entry not returned

[manot40]

What does this PR do?

Added condition to check if getLiveEntry error (invoked by getEmDashEntry) is Astro's LiveEntryNotFoundError inside localeChain loop. This make sure to check every possible language chain before returning empty entry field.

Closes #1679

Type of change

• Bug fix
• Feature (requires maintainer-approved Discussion)
• Refactor (no behavior change)
• Translation
• Documentation
• Performance improvement
• Tests
• Chore (dependencies, CI, tooling)

Checklist

• I have read CONTRIBUTING.md
• pnpm typecheck passes
• pnpm lint passes
• pnpm test passes (or targeted tests for my change)
• pnpm format has been run
• I have added/updated tests for my changes (if applicable)
• User-visible strings in the admin UI are wrapped for translation (if applicable). Do not include messages.po changes except in translation PRs — a workflow extracts catalogs on merge to main.
• I have added a changeset (if this PR changes a published package)
• New features link to an approved Discussion: https://github.com/emdash-cms/emdash/discussions/...

AI-generated code disclosure

• This PR includes AI-generated code — model/tool:

[changeset-bot]

🦋 Changeset detected

Latest commit: af098ee

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

This PR includes changesets to release 16 packages

Name	Type
emdash	Patch
@emdash-cms/cloudflare	Patch
@emdash-cms/sandbox-workerd	Patch
@emdash-cms/fixture-perf-site	Patch
@emdash-cms/perf-demo-site	Patch
@emdash-cms/cache-demo-site	Patch
@emdash-cms/do-demo-site	Patch
@emdash-cms/do-solo-demo-site	Patch
@emdash-cms/admin	Patch
@emdash-cms/auth	Patch
@emdash-cms/blocks	Patch
@emdash-cms/gutenberg-to-portable-text	Patch
@emdash-cms/x402	Patch
create-emdash	Patch
@emdash-cms/auth-atproto	Patch
@emdash-cms/plugin-embeds	Patch

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[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[manot40]

I have read the CLA Document and I hereby sign the CLA

[emdashbot]

The approach is directionally right: Astro's getLiveEntry can surface a missing locale-specific entry as LiveEntryNotFoundError, and the fallback loop should not short-circuit on the first not-found. However, the fix as written is incomplete, untested, and has an AGENTS.md-convention issue in its changeset.

I read packages/core/src/query.ts, src/i18n/config.ts, and the EntryResult contract, and confirmed there are no existing tests covering fallback-locale entry resolution. The function's own docs say entry: null if not found, and error is only for actual errors (DB failures, etc.). The current PR satisfies that for intermediate locales but still returns the not-found error at the end of the fallback chain, which breaks the documented contract. A simpler and more correct fix is to always continue on LiveEntryNotFoundError and let the existing end-of-loop returns produce entry: null.

Headline: fix the fallback overflow for the final locale, add a reproducing test, and rewrite the changeset to be user-facing.

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commit: af098ee