feat: ModalLightbox component

[sourcefilter]

Connected to APPS-1590

Component Created: ModalLightbox.vue

Stories: ~/stories/ModalLightbox.stories.js

Spec: ~/stories/ModalLightbox.spec.js

Notes:

Tried to adapt something that could be used for both MediaGallery and Campus Map layouts, but that proved too difficult. This is the Map layout, and can be generalized to other cases. Main content is inserted in a slot, and presented in the middle 75% of each window axis.

Also fixes an error warning about loading SectionHeader in FlexibleBlocks

Checklist:

• [ ] I checked that it is working locally in the dev server
• [x] I checked that it is working locally in the storybook
• [ ] I checked that it is working locally in the library-website-nuxt dev server
• [ ] I added a screenshot of it working
• [ ] UX has reviewed and approved this
• [ ] I assigned this PR to someone on the dev team to review
• [x] I used a conventional commit message
• [x] I assigned myself to this PR

[github-actions[bot]]

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[github-actions[bot]]

🚀 Deployed on https://deploy-preview-243--ucla-library-storybook.netlify.app

[sourcefilter]

Storybook: https://deploy-preview-243--ucla-library-storybook.netlify.app/?path=/story/modal-lightbox--default

(uses a blank

with white background as content)

[pghorpade]

:tada: This PR is included in version 2.3.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: