Fix scrollbar flickering issue in modal overlay

Fix scrollbar flickering issue in modal overlay

Implement core functionality

Add Python tests

Fix Python code style

Fix Python code style

Refactor Python code

Refactor Python code

Resolve intermittent crash caused by unhandled async error in router

Update project configuration

Implement optimistic UI updates for faster perceived response

Replace moment.js with dayjs to reduce bundle size

Replace moment.js with dayjs to reduce bundle size

Improve code quality

Remove unused feature flags and legacy config values