feat: [] Make Closest Preview preview field configurable

[Mitch Goudy (mgoudy91)]

Summary

Adds a configurable installation parameter for the field id Closest Preview uses to identify previewable page entries, while keeping \ as the default so existing installs remain unchanged.

Staging link

Changes

• Add a config-screen field for the preview field id and persist it in installation parameters
• Use the configured field id when filtering eligible content types and when finding related root entries in the sidebar
• Extend tests to cover both the default \ behavior and a custom field id like

Testing

1. In the app config screen, set Preview field id to url for the customer-like scenario.
2. Assign the relevant nested content types in the sidebar config.
3. Open an entry that links up to a page entry using url instead of slug and confirm the sidebar now surfaces the parent previewable page.

[Copilot]

Pull request overview

Adds support for configuring which field ID “Closest Preview” uses to determine whether an entry is previewable (defaulting to slug for backwards compatibility).

Changes:

• Add a “Preview field id” input to the Config Screen and persist it as an installation parameter.
• Use the configured field id when filtering eligible content types and when identifying “root” entries in the Sidebar.
• Extend mocks/tests to cover both default (slug) and custom (e.g. url) field ids.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
apps/closest-preview/src/locations/ConfigScreen.tsx	Adds UI + persistence for configurable preview field id and passes it into content type filtering.
apps/closest-preview/src/components/ContentTypeMultiSelect.tsx	Threads slugFieldId into content type filtering and updates effect deps/defaults.
apps/closest-preview/src/utils/livePreviewUtils.ts	Makes slug-field checks configurable in content type filtering + root entry detection.
apps/closest-preview/src/types.ts	Introduces installation parameter type and default slug field id constant.
apps/closest-preview/test/locations/ConfigScreen.spec.tsx	Expands tests to cover loading/saving custom preview field id and filtering behavior.
apps/closest-preview/test/locations/Sidebar.spec.tsx	Adds coverage for Sidebar behavior when preview field id is customized.
apps/closest-preview/test/mocks/mockSdk.ts	Adds installation parameters to the SDK mock.
apps/closest-preview/test/mocks/mockCma.ts	Adds url field + data to support custom field id tests.

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