feat: generalized cell editing with server-side auto-save and bulk autofill utility

Fix st.dialog compatibility and override backend port for Hugging Face Spaces

Feature: custom skeleton loaders, dynamic PC IP address binding, sidebar refresh & reset operations, and join sheet mismatch fix

feat: enhance join columns selection, add sidebar popups, enforce dark theme, support CSV files, and add tooltips

feat: initial commit of Antigravity 2.0 analytics engine with Calamine parsing and network binding fixes