December 2025 monthly summary focusing on delivering business value and technical impact in Public-Health-Scotland/list-localities-profiles. Key feature delivered: Document Navigation Simplification, reducing the table of contents from three levels to a single level to streamline user workflow when accessing locality profiles. No major bugs fixed this period due to the scope of changes being a UI/UX refactor. Overall impact includes faster access to locality information, reduced navigation complexity, and improved onboarding consistency across the repository. Technologies/skills demonstrated include frontend navigation refactor, single-level ToC design, and disciplined commit traceability (commit: ac6915c641cfd01a85dc1e26243093310d9386aa).