- completely rewrite the Sonner toaster component with theme-aligned styling, default top-center position, brand-colored toast states, and improved spacing/sizing
- update root layout to remove hardcoded Toaster position prop since the component now handles its own positioning
- add toggle to show/hide completed quote items on the quote process page
- add empty state message when all quote items are fully processed
- memoize displayed quote items for stable sorting and filtering
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