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Added JavaScript to the trip.html.twig template that: - Adds event listeners to filter buttons (.trip-filter-btn) - Shows/hides article cards based on data-type attribute (journal/story) - Manages active state of filter buttons - Displays empty state message when no results match the filter - Uses ES5 syntax (no arrow functions, const/let, or template literals) Also added hidden feed-filter-empty element to display appropriate empty messages for each filter type. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RB86BaJBG3eGiMdfhmHRrQ