feat(select): implement custom Select component with dropdown functionality

src/components/ui/Select.tsx

@@ -0,0 +1,75 @@
+import { useState, useEffect, useRef } from 'react';
+import { IconChevronDown } from './icons';
+import styles from './Select.module.scss';
+
+export interface SelectOption {
+  value: string;
+  label: string;
+}
+
+interface SelectProps {
+  value: string;
+  options: SelectOption[];
+  onChange: (value: string) => void;
+  placeholder?: string;
+  className?: string;
+}
+
+export function Select({ value, options, onChange, placeholder, className }: SelectProps) {
+  const [open, setOpen] = useState(false);
+  const wrapRef = useRef<HTMLDivElement | null>(null);
+
+  useEffect(() => {
+    if (!open) return;
+    const handleClickOutside = (event: MouseEvent) => {
+      if (!wrapRef.current?.contains(event.target as Node)) setOpen(false);
+    };
+    document.addEventListener('mousedown', handleClickOutside);
+    return () => document.removeEventListener('mousedown', handleClickOutside);
+  }, [open]);
+
+  const selected = options.find((o) => o.value === value);
+  const displayText = selected?.label ?? placeholder ?? '';
+  const isPlaceholder = !selected && placeholder;
+
+  return (
+    <div className={`${styles.wrap} ${className ?? ''}`} ref={wrapRef}>
+      <button
+        type="button"
+        className={styles.trigger}
+        onClick={() => setOpen((prev) => !prev)}
+        aria-haspopup="listbox"
+        aria-expanded={open}
+      >
+        <span className={`${styles.triggerText} ${isPlaceholder ? styles.placeholder : ''}`}>
+          {displayText}
+        </span>
+        <span className={styles.triggerIcon} aria-hidden="true">
+          <IconChevronDown size={14} />
+        </span>
+      </button>
+      {open && (
+        <div className={styles.dropdown} role="listbox">
+          {options.map((opt) => {
+            const active = opt.value === value;
+            return (
+              <button
+                key={opt.value}
+                type="button"
+                role="option"
+                aria-selected={active}
+                className={`${styles.option} ${active ? styles.optionActive : ''}`}
+                onClick={() => {
+                  onChange(opt.value);
+                  setOpen(false);
+                }}
+              >
+                {opt.label}
+              </button>
+            );
+          })}
+        </div>
+      )}
+    </div>
+  );
+}