fix(content): search searchable custom fields

[logelog]

What does this PR do?

Content-list search now includes every schema field marked searchable, in addition to the collection display fields and slug.

The FTS path already indexed searchable custom fields, but the fallback path only matched slug, title, and name. That made custom metadata search backend-dependent and prevented values such as internal ticket numbers from being found when FTS could not serve the query.

This change keeps the existing FTS path, resolves searchable fields from the collection schema, and casts fallback values to text so scalar custom fields can be matched consistently across supported SQL dialects.

Addresses the search portion of #2179.

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). No user-visible strings were added.
• I have added a changeset (if this PR changes a published package)
• New features link to an approved Discussion: N/A (bug fix)

Screenshots / test output

• pnpm --filter emdash test --run tests/integration/content/content-list-search.test.ts tests/integration/content/content-list-search-fts.test.ts (17 tests passed)
• pnpm typecheck
• pnpm lint
• pnpm format:check

[changeset-bot]

🦋 Changeset detected

Latest commit: d5706ce

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

This PR includes changesets to release 17 packages

Name	Type
emdash	Patch
@emdash-cms/cloudflare	Patch
@emdash-cms/sandbox-workerd	Patch
@emdash-cms/plugin-mcp-smoke	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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commit: d5706ce

[github-actions]

Overlapping PRs

This PR modifies files that are also changed by other open PRs:

• feat: reference field type (storage-less edges + admin UI) #1928 (3 shared files)

This may cause merge conflicts or duplicated work. A maintainer will coordinate.