Local map fix

[annaxuphoto]

The map on https://code.org/learn/local is not calculating its position correctly, and the position: sticky property is not working as expected (these bugs were hard to reproduce locally, because a difference in element height made scrolling on the local environment unnecessary).

This PR adds a bottomSpacing property to the map's sticky call such that the map does not overlap the footer. It also recalculates bottomSpacing when the window is resized, to adjust dynamically to a potentially different footer height.

Links

Jira

Testing story

• forced the document height to 2000px in order to correctly test scrolling
• resized the window multiple times in a single page load to ensure that the bottomSpacing updates correctly

Deployment strategy

Follow-up work

Privacy

Security

Caching

PR Checklist:

• Tests provide adequate coverage
• Privacy and Security impacts have been assessed
• Code is well-commented
• New features are translatable or updates will not break translations
• Relevant documentation has been added or updated
• User impact is well-understood and desirable
• Pull Request is labeled appropriately
• Follow-up work items (including potential tech debt) are tracked and linked