Establishes frontend unit testing infra (jsdom env, RTL, jest-dom
matchers, common Radix/jsdom polyfills) and seeds it with tests for
lib/utils.ts, lib/photo-utils.ts, hooks/useFocusTrap.ts, and
ThemeToggle.tsx (46 tests total).
This commit introduces several new scripts for managing database operations, including user creation, permission grants, and data migrations. It also adds new documentation files to guide users through the setup and configuration processes. Additionally, the project structure is updated to enhance organization and maintainability, ensuring a smoother development experience for contributors. These changes support the ongoing transition to a web-based architecture and improve overall project functionality.