#97 UI: Multi-Select Dropdown Component

Create multi-select dropdown for filters. Component: api/ui/templates/components/multi_select/ Files: - multi_select.html - multi_select.css - multi_select.js Features: - Single and multi-select modes - Searchable options - Option groups (categories) - Clear all button - Select all button (multi-select) - Selected items as pills/badges Display: - Dropdown opens below/above based on space - Selected count when collapsed - Checkboxes for multi-select - Radio for single-select - Option descriptions (optional) Keyboard: - Arrow keys navigation - Enter to select - ESC to close - Type to search States: - Loading (async options) - No results - Disabled - Error JavaScript API: - new MultiSelect(element, config) - select.setOptions(options) - select.setValue(values) - select.getValue() - select.onChange(callback) Async: - Load options on open - Infinite scroll for large lists With ultra attention to details and correctness. Before closing: write comment summarizing implementation with screenshot.