Separate ListRow trailing control and fail fast on out-of-range Slider

ListRow with onClick now renders a container whose leading slot, title
and meta form one button, with the trailing slot as a sibling outside
it, so a trailing toggle or action is never nested in the row button
and never triggers the row's action.

Slider throws when value is outside [min, max] (including NaN) instead
of rendering a fill that disagrees with the clamped native input.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/ui/ListRow.module.css

@@ -11,18 +11,36 @@
 }
 
 .interactive {
-  min-width: 44px;
-  border: 0;
+  padding: 0;
   border-radius: var(--radius-md);
-  background: transparent;
-  font: inherit;
-  cursor: pointer;
 }
 
 .interactive:hover {
   background: var(--color-neutral-200);
 }
 
+.main {
+  box-sizing: border-box;
+  display: flex;
+  align-items: center;
+  gap: var(--space-3);
+  flex: 1 1 auto;
+  min-width: 44px;
+  min-height: 44px;
+  padding: 14px 16px;
+  border: 0;
+  border-radius: var(--radius-md);
+  background: transparent;
+  color: inherit;
+  font: inherit;
+  text-align: left;
+  cursor: pointer;
+}
+
+.interactive > .trailing {
+  padding-right: 16px;
+}
+
 .leading,
 .trailing {
   display: inline-flex;

web/src/ui/ListRow.test.tsx

@@ -2,6 +2,7 @@ import { fireEvent, render, screen } from '@testing-library/react'
 import { describe, expect, it, vi } from 'vitest'
 import { expectMinHitArea } from '../test/hitArea.ts'
 import { ListRow } from './ListRow.tsx'
+import { Toggle } from './Toggle.tsx'
 
 describe('ListRow', () => {
   it('renders leading, title, meta and trailing slots without being interactive', () => {
@@ -28,4 +29,29 @@ describe('ListRow', () => {
     fireEvent.click(row)
     expect(onClick).toHaveBeenCalledOnce()
   })
+
+  it('keeps a trailing toggle outside the row button so each control fires only its own action', () => {
+    const onClick = vi.fn()
+    const onCheckedChange = vi.fn()
+    render(
+      <ListRow
+        title="Dinner reminders"
+        meta="Push at 4 pm"
+        trailing={<Toggle aria-label="Dinner reminders" checked={false} onCheckedChange={onCheckedChange} />}
+        onClick={onClick}
+      />,
+    )
+    const row = screen.getByRole('button', { name: /^Dinner reminders/ })
+    const toggle = screen.getByRole('switch', { name: 'Dinner reminders' })
+    expect(row).not.toContainElement(toggle)
+    expect(row.querySelector('button')).toBeNull()
+
+    fireEvent.click(toggle)
+    expect(onCheckedChange).toHaveBeenCalledExactlyOnceWith(true)
+    expect(onClick).not.toHaveBeenCalled()
+
+    fireEvent.click(row)
+    expect(onClick).toHaveBeenCalledOnce()
+    expect(onCheckedChange).toHaveBeenCalledOnce()
+  })
 })

web/src/ui/ListRow.tsx

@@ -8,29 +8,38 @@ export type ListRowProps = {
   leading?: ReactNode
   // Trailing slot: chevron, toggle, count or action.
   trailing?: ReactNode
-  // When set, the whole row is a button.
+  // When set, the leading slot, title and meta form one button. The trailing
+  // slot stays a sibling outside it, so a trailing toggle or action is never
+  // nested in the row's button and never triggers the row's action.
   onClick?: () => void
   className?: string
 }
 
 export function ListRow({ title, meta, leading, trailing, onClick, className }: ListRowProps) {
-  const content = (
+  const main = (
     <>
       {leading && <span className={styles.leading}>{leading}</span>}
       <span className={styles.body}>
         <span className={styles.title}>{title}</span>
         {meta && <span className={styles.meta}>{meta}</span>}
       </span>
-      {trailing && <span className={styles.trailing}>{trailing}</span>}
     </>
   )
-  const classes = [styles.row, className].filter(Boolean).join(' ')
+  const trailingSlot = trailing && <span className={styles.trailing}>{trailing}</span>
   if (onClick) {
     return (
-      <button type="button" className={`${classes} ${styles.interactive}`} onClick={onClick}>
-        {content}
-      </button>
+      <div className={[styles.row, styles.interactive, className].filter(Boolean).join(' ')}>
+        <button type="button" className={styles.main} onClick={onClick}>
+          {main}
+        </button>
+        {trailingSlot}
+      </div>
     )
   }
-  return <div className={classes}>{content}</div>
+  return (
+    <div className={[styles.row, className].filter(Boolean).join(' ')}>
+      {main}
+      {trailingSlot}
+    </div>
+  )
 }

web/src/ui/Slider.test.tsx

@@ -47,4 +47,23 @@ describe('Slider', () => {
       'max (1) must be greater than min (1)',
     )
   })
+
+  it('accepts values at both ends of the range', () => {
+    render(
+      <>
+        <Slider aria-label="At min" min={0} max={1} value={0} readOnly />
+        <Slider aria-label="At max" min={0} max={1} value={1} readOnly />
+      </>,
+    )
+    expect(screen.getByRole('slider', { name: 'At min' }).style.getPropertyValue('--slider-fill')).toBe('0%')
+    expect(screen.getByRole('slider', { name: 'At max' }).style.getPropertyValue('--slider-fill')).toBe('100%')
+  })
+
+  it.each([
+    [2, 'value (2) must be within [0, 1]'],
+    [-0.1, 'value (-0.1) must be within [0, 1]'],
+    [Number.NaN, 'value (NaN) must be within [0, 1]'],
+  ])('fails fast when the value %s is outside the range', (value, message) => {
+    expect(() => render(<Slider aria-label="Bad" min={0} max={1} value={value} readOnly />)).toThrow(message)
+  })
 })

web/src/ui/Slider.tsx

@@ -12,6 +12,9 @@ export type SliderProps = Omit<ComponentPropsWithRef<'input'>, 'type' | 'value'
 // Name it with aria-label or aria-labelledby.
 export function Slider({ value, min, max, className, style, ...rest }: SliderProps) {
   if (!(max > min)) throw new Error(`Slider: max (${max}) must be greater than min (${min})`)
+  if (!(value >= min && value <= max)) {
+    throw new Error(`Slider: value (${value}) must be within [${min}, ${max}]`)
+  }
   const fill = `${((value - min) / (max - min)) * 100}%`
   return (
     <input