feat(ui): premium SaaS redesign — Carbon Navy theme, semantic colors, tighter typography

feat(branding): rebrand to Nexar with S&P 500 enterprise visual identity

feat: enhance UI experience and refine system behaviour for improved usability

feat(ui): improve user interactions, enhance usability, and align UI with product-grade standards

fix: remove abc_class string column from generator output

feat(ui): upgrade interface with refined layout, improved interactions, and enhanced functional components

ui: further refine layout, spacing, and component consistency for premium feel

fix: replace deprecated use_container_width with width parameter

fix: add zone column to slotting_df to resolve KeyError on hero badge

Prepare Streamlit app for deployment

Polish dashboard UI and add theme toggle

fix: replace px.strip with px.scatter to support color_continuous_scale

Added Dev Container Folder

Stabilize Streamlit Cloud startup

fix: eliminate double inventory computation, optimise feature engineering, and tune training speed