feat: create event form with datetime validation

feat: implement main calendar view with monthly grid

feat: implement HTTP client for backend API integration

feat: add application configuration with API settings and theme

update numpy_basics

update numpy_basics

update numpy_basics

update numpy_basics

update numpy_basics

update include/base_interface.hpp

update include/base_interface.hpp

update tests/sample_test.cpp

update include/base_interface.hpp

update tests/sample_test.cpp