feat(ui): add InterfaceNavItemSchema, disambiguate PageTypeSchema overlaps#697

hotlong merged 2 commits into

copilot/enhance-ui-protocolobjectstack-ai/objectstack:copilot/enhance-ui-protocolfrom

copilot/review-design-document-revisionsobjectstack-ai/objectstack:copilot/review-design-document-revisionsCopy head branch name to clipboard