Edit Issue - .issue.db

Title *

Description

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.

Due Date (YYYY-MM-DD)

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Edit Issue #97