phsl / new-api

* Added `position: sticky; top: 0; z-index: 5;` to search bar container
  – keeps the bar fixed while the table body scrolls
* Preserves previous padding, border and background styles
* Improves usability by ensuring quick access to search & actions during long list navigation

• PricingTable
  • Added `compactMode` prop; strips fixed columns and sets `scroll={compactMode ? undefined : { x: 'max-content' }}`
  • Processes columns to remove `fixed` in compact mode

• PricingPage & index.css
  • Added `.pricing-scroll-hide` utility to hide Y-axis scrollbar for `Sider` & `Content`

• Responsive / style refinements
  • Sidebar width adjusted to 460px
  • Scrollbars hidden uniformly across pricing modules

These changes complete the model-pricing UI refactor, ensuring clean scrolling, responsive filters, and fixed availability column for better usability.