feat(core): support field-level and range filters in where clause

[Glacier-Luo]

What does this PR do?

The loader's where option previously only processed taxonomy-based keys (via JOIN). Non-taxonomy field names were silently discarded, forcing sites with large content libraries to load entire collections into memory and filter in JavaScript.

This adds two capabilities to getEmDashCollection's where clause:

• Exact/multi-value match on content table columns — { series: "main" } or { series: ["main", "side"] }
• Range comparisons — { published_at: { gte: "2024-01-01T00:00:00Z", lt: "2025-01-01T00:00:00Z" } }

Both execute at the SQL layer with parameterized queries and validated identifiers. Taxonomy filtering remains unchanged (backward compatible).

Motivation: A fiction serialization site with ~4000 chapters spanning 10+ years. The timeline page needs to filter by year (published_at range) and by series (field exact match). Without SQL-level field filtering, the only options are wasteful full-table JS filtering or dropping to raw getDb() and losing preview, visual editing, byline hydration, and request caching.

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 (N/A — no UI changes)
• I have added a changeset (if this PR changes a published package)
• New features link to an approved Discussion: Support field-level and range filters in getEmDashCollection where clause #1065

AI-generated code disclosure

• This PR includes AI-generated code — model/tool: Claude Opus 4.6 (Claude Code)

Screenshots / test output

 Test Files  209 passed (209)
      Tests  3305 passed (3305)

Usage examples

// Exact match on a content field
const { entries } = await getEmDashCollection("posts", {
  where: { series: "main" },
});

// Date range filtering
const { entries } = await getEmDashCollection("posts", {
  where: { published_at: { gte: "2024-01-01T00:00:00Z", lt: "2025-01-01T00:00:00Z" } },
  orderBy: { published_at: "asc" },
});

// Combined: taxonomy + field + range
const { entries } = await getEmDashCollection("posts", {
  where: { category: "fiction", series: "main", published_at: { gte: "2024-01-01" } },
});

[changeset-bot]

🦋 Changeset detected

Latest commit: b4f484a

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

This PR includes changesets to release 13 packages

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

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commit: b4f484a