Add JSON response format to board publication toggle

[robzolkos]

Summary

• Adds respond_to blocks to Boards::PublicationsController for JSON support alongside existing Turbo Stream responses
• Publishing returns 201 Created with the shareable key and public url
• Unpublishing returns 204 No Content
• Only board administrators can publish/unpublish (existing permission check unchanged)

[Copilot]

Pull request overview

Adds JSON support for publishing/unpublishing boards so API clients can toggle public access and receive a shareable link, alongside the existing Turbo Stream behavior.

Changes:

• Add respond_to JSON branches in Boards::PublicationsController#create/destroy (201 w/ {key,url} on publish, 204 on unpublish).
• Add integration tests for JSON publish/unpublish.
• Document the new Board Publications endpoints in docs/API.md.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
app/controllers/boards/publications_controller.rb	Adds JSON responses for publish/unpublish actions alongside Turbo Stream.
test/controllers/boards/publications_controller_test.rb	Adds JSON request tests for publish/unpublish.
docs/API.md	Documents Board Publications API endpoints and example responses.

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[jeremy]

Is this the default Rails response anyway? Can it be omitted?

[jeremy]

JSON response should typically be the entity created. Would add a partial for the board publication, include it in boards/_board (if published), and then choose whether to render the publication itself or the entire board in response here.