feat: Select, Checkbox, Toggle form primitives

src/design-system/primitives/Checkbox/Checkbox.module.css

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+.wrapper {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  cursor: pointer;
+  user-select: none;
+}
+
+.input {
+  position: absolute;
+  opacity: 0;
+  width: 0;
+  height: 0;
+  margin: 0;
+}
+
+.box {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 15px;
+  height: 15px;
+  border: 1px solid var(--border);
+  border-radius: 3px;
+  background: var(--bg-raised);
+  flex-shrink: 0;
+  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
+}
+
+.box::after {
+  content: '';
+  display: none;
+  width: 4px;
+  height: 7px;
+  border: 2px solid white;
+  border-top: none;
+  border-left: none;
+  transform: rotate(45deg) translateY(-1px);
+}
+
+.input:checked + .box {
+  background: var(--amber);
+  border-color: var(--amber);
+}
+
+.input:checked + .box::after {
+  display: block;
+}
+
+.input:focus-visible + .box {
+  border-color: var(--amber);
+  box-shadow: 0 0 0 3px var(--amber-bg);
+}
+
+.input:disabled + .box {
+  opacity: 0.6;
+  cursor: not-allowed;
+}
+
+.wrapper:has(.input:disabled) {
+  cursor: not-allowed;
+  opacity: 0.6;
+}
+
+.label {
+  font-family: var(--font-body);
+  font-size: 12px;
+  color: var(--text-primary);
+}

src/design-system/primitives/Checkbox/Checkbox.tsx

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+import styles from './Checkbox.module.css'
+import { forwardRef, type InputHTMLAttributes, type ReactNode } from 'react'
+
+interface CheckboxProps extends Omit<InputHTMLAttributes<HTMLInputElement>, 'type'> {
+  label?: ReactNode
+  id?: string
+}
+
+export const Checkbox = forwardRef<HTMLInputElement, CheckboxProps>(
+  ({ label, id, className, ...rest }, ref) => {
+    const inputId = id ?? `checkbox-${Math.random().toString(36).slice(2)}`
+    return (
+      <label className={`${styles.wrapper} ${className ?? ''}`} htmlFor={inputId}>
+        <input
+          ref={ref}
+          id={inputId}
+          type="checkbox"
+          className={styles.input}
+          {...rest}
+        />
+        <span className={styles.box} aria-hidden="true" />
+        {label && <span className={styles.label}>{label}</span>}
+      </label>
+    )
+  },
+)
+
+Checkbox.displayName = 'Checkbox'

src/design-system/primitives/Select/Select.module.css

@@ -0,0 +1,40 @@
+.wrap {
+  position: relative;
+  display: inline-block;
+  width: 100%;
+}
+
+.select {
+  width: 100%;
+  padding: 6px 32px 6px 12px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  background: var(--bg-raised);
+  color: var(--text-primary);
+  font-family: var(--font-body);
+  font-size: 12px;
+  outline: none;
+  appearance: none;
+  cursor: pointer;
+  transition: border-color 0.15s, box-shadow 0.15s;
+}
+
+.select:focus {
+  border-color: var(--amber);
+  box-shadow: 0 0 0 3px var(--amber-bg);
+}
+
+.select:disabled {
+  opacity: 0.6;
+  cursor: not-allowed;
+}
+
+.chevron {
+  position: absolute;
+  right: 10px;
+  top: 50%;
+  transform: translateY(-50%);
+  color: var(--text-faint);
+  font-size: 11px;
+  pointer-events: none;
+}

src/design-system/primitives/Select/Select.tsx

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+import styles from './Select.module.css'
+import { forwardRef, type SelectHTMLAttributes } from 'react'
+
+interface SelectOption {
+  value: string
+  label: string
+}
+
+interface SelectProps extends SelectHTMLAttributes<HTMLSelectElement> {
+  options: SelectOption[]
+}
+
+export const Select = forwardRef<HTMLSelectElement, SelectProps>(
+  ({ options, className, ...rest }, ref) => {
+    return (
+      <div className={`${styles.wrap} ${className ?? ''}`}>
+        <select ref={ref} className={styles.select} {...rest}>
+          {options.map((opt) => (
+            <option key={opt.value} value={opt.value}>
+              {opt.label}
+            </option>
+          ))}
+        </select>
+        <span className={styles.chevron} aria-hidden="true">▾</span>
+      </div>
+    )
+  },
+)
+
+Select.displayName = 'Select'

src/design-system/primitives/Toggle/Toggle.module.css

@@ -0,0 +1,68 @@
+.wrapper {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  cursor: pointer;
+  user-select: none;
+}
+
+.input {
+  position: absolute;
+  opacity: 0;
+  width: 0;
+  height: 0;
+  margin: 0;
+}
+
+.track {
+  position: relative;
+  display: inline-block;
+  width: 32px;
+  height: 18px;
+  border-radius: 9px;
+  background: var(--border);
+  border: 1px solid var(--border);
+  flex-shrink: 0;
+  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
+}
+
+.thumb {
+  position: absolute;
+  top: 2px;
+  left: 2px;
+  width: 12px;
+  height: 12px;
+  border-radius: 50%;
+  background: white;
+  box-shadow: var(--shadow-sm);
+  transition: transform 0.2s;
+}
+
+.input:checked + .track {
+  background: var(--amber);
+  border-color: var(--amber);
+}
+
+.input:checked + .track .thumb {
+  transform: translateX(14px);
+}
+
+.input:focus-visible + .track {
+  box-shadow: 0 0 0 3px var(--amber-bg);
+  border-color: var(--amber);
+}
+
+.input:disabled + .track {
+  opacity: 0.6;
+}
+
+.wrapper:has(.input:disabled) {
+  cursor: not-allowed;
+  opacity: 0.6;
+}
+
+.label {
+  font-family: var(--font-body);
+  font-size: 12px;
+  color: var(--text-primary);
+}

src/design-system/primitives/Toggle/Toggle.tsx

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+import styles from './Toggle.module.css'
+import { forwardRef, type InputHTMLAttributes } from 'react'
+
+interface ToggleProps extends Omit<InputHTMLAttributes<HTMLInputElement>, 'type'> {
+  label?: string
+  id?: string
+}
+
+export const Toggle = forwardRef<HTMLInputElement, ToggleProps>(
+  ({ label, id, className, ...rest }, ref) => {
+    const inputId = id ?? `toggle-${Math.random().toString(36).slice(2)}`
+    return (
+      <label className={`${styles.wrapper} ${className ?? ''}`} htmlFor={inputId}>
+        <input
+          ref={ref}
+          id={inputId}
+          type="checkbox"
+          className={styles.input}
+          {...rest}
+        />
+        <span className={styles.track} aria-hidden="true">
+          <span className={styles.thumb} />
+        </span>
+        {label && <span className={styles.label}>{label}</span>}
+      </label>
+    )
+  },
+)
+
+Toggle.displayName = 'Toggle'