Docs: Collection example

[madsrasmussen]

This PR adds a basic "Collection Example" to the examples folder.

The examples include:

• Collection Registration
• Collection Repository
• Collection Pagination
• Table Collection View
• Card Collection View
• Collection as a Dashboard
• Collection as a Workspace View

Additional things we can include in the example. These will

• Collection Action
• Collection Filtering
• Entity Actions
• Selection + Bulk Action

Dashboard

Workspace View

[Copilot]

Pull Request Overview

This PR adds a comprehensive "Collection Example" to the examples folder to demonstrate collection registration, repository implementation, different collection views (table and card), and a dashboard integration.

• Added new collection manifests, repository modules, and view components for table and card layouts.
• Introduced a dashboard example that presents the collection data.
• Updated server extension registration to use optional chaining.

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Umbraco.Web.UI.Client/src/libs/extension-api/controller/server-extension-registrator.controller.ts	Updated to use optional chaining for the packages list.
src/Umbraco.Web.UI.Client/examples/collection/index.ts	Added an entry point to merge collection and dashboard manifests.
src/Umbraco.Web.UI.Client/examples/collection/dashboard-with-collection/manifests.ts	New dashboard manifest configuration.
src/Umbraco.Web.UI.Client/examples/collection/dashboard-with-collection/dashboard-with-collection.element.ts	Dashboard element implementing the collection view.
src/Umbraco.Web.UI.Client/examples/collection/collection/table-view/manifests.ts	New table collection view manifest.
src/Umbraco.Web.UI.Client/examples/collection/collection/table-view/index.ts	Re-export file for table view constant.
src/Umbraco.Web.UI.Client/examples/collection/collection/table-view/collection-view.element.ts	Table view element rendering collection items.
src/Umbraco.Web.UI.Client/examples/collection/collection/repository/*	New repository types, constants, manifests, and implementation for the collection.
src/Umbraco.Web.UI.Client/examples/collection/collection/manifests.ts	New collection manifest merging various view and repository manifests.
src/Umbraco.Web.UI.Client/examples/collection/collection/card-view/manifests.ts	New card collection view manifest.
src/Umbraco.Web.UI.Client/examples/collection/collection/card-view/index.ts	Re-export file for card view constant.
src/Umbraco.Web.UI.Client/examples/collection/collection/card-view/collection-view.element.ts	Card view element using a grid layout to display items.
src/Umbraco.Web.UI.Client/examples/collection/README.md	Documentation update outlining the collection example features and outstanding tasks.

Comments suppressed due to low confidence (2)

src/Umbraco.Web.UI.Client/examples/collection/collection/table-view/index.ts:1

• The re-exported constant 'UMB_LANGUAGE_TABLE_COLLECTION_VIEW_ALIAS' is not defined in the corresponding manifests file. Please define this constant in the manifests or remove the re-export if it is not needed.

export { UMB_LANGUAGE_TABLE_COLLECTION_VIEW_ALIAS } from './manifests.js';

[leekelleher]

LGTM! 🚀