feat(marketplace): cross-instance browse page + entry points

[LWS49]

• add cross-instance listings index (published only, live counts)
• add browse page with title search, adoptions/newest sort, row select
• add sidebar admin entry + /courses/:id/marketplace route
• add "Import Assessments" button on assessments index (from_tab)
• add FE api/operations/types, controller + component specs

[adi-herwana-nus]

Is this display_name referenced anywhere?

(Just realizing this now, but gradebook component has a similar field that should also probably be removed.)

[LWS49]

Yep, both should be removed. Not removing the gradebook one in this commit so that this branch stays marketplace-only; lmk if you prefer for me to do so instead.

Thought I needed to add it because app/controllers/components/course/controller_component_host.rb has a def display_name; this is meant to override that, but that's old code that is meant to feed the Slim view, which is now fully retired in favour of jbuilder. Component titles now come from course.componentTitles.

[Copilot]

Pull request overview

Adds a new “Assessment Marketplace” feature area under a course, including a cross-instance listings index endpoint, a React browse page (sorting + title search + row selection), new navigation entry points (sidebar + route), and an “Import Assessments” button that deep-links into the marketplace.

Changes:

• Introduces backend marketplace index controller + JSON payload, with controller/component specs.
• Adds frontend marketplace route, page/table, API client + operations/types, and component/page tests.
• Wires new entry points: admin sidebar item, /courses/:id/marketplace route, and an “Import Assessments” button on the assessments index.

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
spec/controllers/course/assessment/marketplace/listings_controller_spec.rb	Controller spec coverage for marketplace listings JSON (published-only + cross-instance visibility).
spec/controllers/course/assessment_marketplace_component_spec.rb	Spec coverage for sidebar visibility gating by ability.
config/routes.rb	Adds /courses/:id/marketplace and marketplace listings routes.
client/locales/zh.json	Adds marketplace/import translations (zh).
client/locales/ko.json	Adds marketplace/import translations (ko).
client/locales/en.json	Adds marketplace/import translations (en).
client/app/routers/course/marketplace.tsx	New course sub-router for marketplace page.
client/app/routers/course/index.tsx	Registers marketplace router under course routes.
client/app/bundles/course/translations.ts	Adds course component title + sidebar item translation keys.
client/app/bundles/course/marketplace/types.ts	Defines MarketplaceListing FE type.
client/app/bundles/course/marketplace/translations.ts	Adds marketplace page/table translation messages.
client/app/bundles/course/marketplace/pages/MarketplaceIndex/MarketplaceTable.tsx	Implements listings table (sort/search/select + bulk duplicate toolbar).
client/app/bundles/course/marketplace/pages/MarketplaceIndex/index.tsx	Marketplace index page that preloads listings and renders the table.
client/app/bundles/course/marketplace/pages/MarketplaceIndex/test/index.test.tsx	Tests default sorting, re-sorting, and title filtering behavior.
client/app/bundles/course/marketplace/operations.ts	Adds fetchListings operation using the marketplace API.
client/app/bundles/course/assessment/translations.ts	Adds “Import Assessments” translation entry for assessments index.
client/app/bundles/course/assessment/pages/AssessmentsIndex/index.tsx	Adds Import button alongside New Assessment button.
client/app/bundles/course/assessment/pages/AssessmentsIndex/ImportAssessmentsButton.tsx	New button linking to marketplace with from_tab query param.
client/app/bundles/course/assessment/pages/AssessmentsIndex/test/ImportAssessmentsButton.test.tsx	Tests the marketplace deep-link and hidden state when disallowed.
client/app/api/course/Marketplace.ts	Adds marketplace index() API call + typing for response payload.
app/views/course/assessment/marketplace/listings/index.json.jbuilder	Adds listings index JSON response shape for the marketplace page.
app/controllers/course/assessment/marketplace/listings_controller.rb	New marketplace listings controller (index + aggregation queries).
app/controllers/course/assessment/marketplace/controller.rb	New base controller binding marketplace component.
app/controllers/components/course/assessment_marketplace_component.rb	Adds marketplace component + admin sidebar item gate by ability.

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