Support blueprintUE embedding

[tsuzuki-takaaki]

What

• Support blueprintUE embedding
• Add blueprintue.com to iframe src white list

blueprintUE's embed URL is like this:

<iframe src="https://blueprintue.com/render/67k4gbg5/" scrolling="no" allowfullscreen></iframe>

Ref

• https://blueprintue.com/

[gemini-code-assist]

Summary of Changes

Hello @tsuzuki-takaaki, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces new functionality to allow embedding content from blueprintue.com within Qiita Markdown. This involves whitelisting blueprintue.com as a trusted source for iframes and integrating a new module to manage its specific embedding details, ensuring safe and proper rendering.

Highlights

• New Embedding Support: I've added support for embedding content from blueprintue.com within Qiita Markdown, expanding the range of external content that can be safely displayed.
• Dedicated Embed Module: A new module, Qiita::Markdown::Embed::BlueprintUe, has been introduced to specifically manage the blueprintue.com script host, following the existing pattern for other embed types.
• Iframe Whitelisting: The FilterIframe transformer has been updated to explicitly allow iframes originating from blueprintue.com, ensuring they are not stripped or modified during markdown processing.
• Comprehensive Testing: New RSpec tests have been added to processor_spec.rb to verify that blueprintUE embeds are correctly processed and displayed, covering scenarios with and without explicit URL schemes.

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[gemini-code-assist]

Code Review

This pull request adds support for embedding content from blueprintUE via iframes. The changes are well-structured and follow the existing patterns in the codebase for other embeddable content. The core logic for whitelisting the new host and the accompanying tests are correctly implemented.

[gemini-code-assist]

The domain blueprintue.com is hardcoded here. To improve maintainability and prevent potential inconsistencies, it's better to use the Qiita::Markdown::Embed::BlueprintUe::SCRIPT_HOST constant defined for this purpose.

let(:url) { "#{scheme}//#{Qiita::Markdown::Embed::BlueprintUe::SCRIPT_HOST}/embed/example" }

[P-SiZK]

LGTM!