Problem/Motivation
Navigation uses layout builder to define regions for content and footer. Currently you can place limited blocks into content, but footer is restricted. Modules like Environment Indicator, Workspaces(core) and Masquerade are examples of modules that may be useful to claim space in Navigation with more rigid placement.
Proposed resolution
Provide hooks to easier extend the top of the content and footer regions.
Remaining tasks
TBD.
User interface changes
Output content_top and footer_top variables/slots in the template.
API changes
TBD.
Release notes snippet
TBD.