Zenodo video embeding

[eilmiv]

Summary of changes

• Added support for embedded videos for training materials on Zenodo similar to the existing YouTube video embedding

Motivation and context

closes #1299

Screenshots

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree to license it to the TeSS codebase under the BSD license.

[Copilot]

Pull request overview

Adds Zenodo-hosted video embedding for materials, analogous to existing YouTube embedding, by introducing a Zenodo renderer, helper wiring, and client-side logic to select an appropriate media file from the Zenodo API.

Changes:

• Add Renderers::Zenodo to generate an HTML5 <video> embed and bootstrap it with a JS helper that fetches the Zenodo files list.
• Wire Zenodo embedding into the materials show view and refactor helper logic to support multiple “video renderers”.
• Add styling + tests/fixtures to cover embedded Zenodo video rendering.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
test/fixtures/materials.yml	Adds a Zenodo “video” material fixture used by controller tests.
test/controllers/materials_controller_test.rb	Adds a show-page assertion for Zenodo embedded video presence.
lib/renderers/zenodo.rb	New renderer that detects Zenodo/DOI URLs and outputs video+script embed markup.
app/views/materials/show.html.erb	Renders Zenodo embed block alongside existing YouTube embed.
app/helpers/materials_helper.rb	Adds embed_zenodo and refactors embedding into a shared embed_video helper.
app/assets/stylesheets/application.scss	Centers embedded content via flexbox.
app/assets/javascripts/materials.js	Adds make_zenodo_video which fetches Zenodo files and sets the <video> source.

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