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Replace Apply button flow with immediate HTMX partial fetches: - toggleCountry() does an optimistic UI update (row + badge) then calls htmx.ajax() targeting #cc-canvas with swap=innerHTML - URL is pushed to history on every selection change (bookmarkable) - HX-Request now returns countries_canvas.html fragment (chips + chart/empty + inline IIFE that re-syncs globals + re-inits Chart.js) - Panel (dark) is never swapped; canvas fades during in-flight request - PALETTE, buildRankings(), initChart() defined once on page load, called by both initial render and partial IIFE after each swap - Apply button removed; Clear triggers fetchCanvas() with empty codes Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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