PIPE-2472: replaced deprecated position correction utilities with CASA Measures framework for zenith distance calculations; updated Field, Analyzealpha, and htmlrenderer modules to use new compute_zenith_distance() utility function; enhanced ZDTELMJDChart with field legends and multi-point support; increased Sky Setup table header font size for visibility and added section headers to clearly distinguish Elevation (All Fields) from Zenith Angle (TARGET Fields Only) data
