improvement(ui): share dashed add-row buttons

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/editor/components/sub-block/components/filter-builder/filter-builder.tsx

@@ -1,8 +1,7 @@
 'use client'
 
 import { useCallback, useMemo } from 'react'
-import { Button } from '@sim/emcn'
-import { Plus } from '@sim/emcn/icons'
+import { AddRowButton } from '@sim/emcn'
 import { useTableColumns } from '@/lib/table/hooks'
 import type { FilterRule } from '@/lib/table/query-builder/constants'
 import { useFilterBuilder } from '@/lib/table/query-builder/use-query-builder'
@@ -83,16 +82,7 @@ export function FilterBuilder({
 
   if (rules.length === 0) {
     if (isReadOnly) return null
-    return (
-      <Button
-        variant='ghost'
-        onClick={addRule}
-        className='h-7 w-full justify-start gap-1.5 border border-[var(--border-1)] border-dashed text-[var(--text-muted)] text-small'
-      >
-        <Plus className='size-[14px]' />
-        Add filter condition
-      </Button>
-    )
+    return <AddRowButton onClick={addRule}>Add filter condition</AddRowButton>
   }
 
   return (

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/editor/components/sub-block/components/sort-builder/sort-builder.tsx

@@ -1,8 +1,7 @@
 'use client'
 
 import { useCallback, useMemo } from 'react'
-import { Button, type ComboboxOption } from '@sim/emcn'
-import { Plus } from '@sim/emcn/icons'
+import { AddRowButton, type ComboboxOption } from '@sim/emcn'
 import { generateId } from '@sim/utils/id'
 import { useTableColumns } from '@/lib/table/hooks'
 import { SORT_DIRECTION_OPTIONS, type SortRule } from '@/lib/table/query-builder/constants'
@@ -86,16 +85,7 @@ export function SortBuilder({
 
   if (rules.length === 0) {
     if (isReadOnly) return null
-    return (
-      <Button
-        variant='ghost'
-        onClick={addRule}
-        className='h-7 w-full justify-start gap-1.5 border border-[var(--border-1)] border-dashed text-[var(--text-muted)] text-small'
-      >
-        <Plus className='size-[14px]' />
-        Add sort
-      </Button>
-    )
+    return <AddRowButton onClick={addRule}>Add sort</AddRowButton>
   }
 
   return (

packages/emcn/src/components/add-row-button/add-row-button.test.tsx

@@ -0,0 +1,47 @@
+/** @vitest-environment jsdom */
+import { act, createRef } from 'react'
+import { AddRowButton } from '@sim/emcn'
+import { createRoot, type Root } from 'react-dom/client'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+
+let root: Root | null = null
+let container: HTMLDivElement | null = null
+
+afterEach(() => {
+  if (root) act(() => root?.unmount())
+  container?.remove()
+  root = null
+  container = null
+})
+
+describe('AddRowButton', () => {
+  it('forwards its ref and action, honors disabled, and preserves native form submission', () => {
+    ;(globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true
+    container = document.createElement('div')
+    document.body.appendChild(container)
+    root = createRoot(container)
+    const ref = createRef<HTMLButtonElement>()
+    const onClick = vi.fn()
+    const onSubmit = vi.fn((event) => event.preventDefault())
+    const render = (disabled: boolean) => (
+      <form onSubmit={onSubmit}>
+        <AddRowButton ref={ref} onClick={onClick} disabled={disabled}>
+          Add filter condition
+        </AddRowButton>
+      </form>
+    )
+    act(() => root?.render(render(false)))
+    const button = ref.current!
+    expect(button).toBe(container.querySelector('button'))
+    expect(button.textContent).toBe('Add filter condition')
+    expect(button.querySelector('svg')?.getAttribute('aria-hidden')).toBe('true')
+    act(() => button.click())
+    expect(onClick).toHaveBeenCalledOnce()
+    expect(onSubmit).toHaveBeenCalledOnce()
+
+    act(() => root?.render(render(true)))
+    expect(button.disabled).toBe(true)
+    act(() => button.click())
+    expect(onClick).toHaveBeenCalledOnce()
+  })
+})

packages/emcn/src/components/add-row-button/add-row-button.tsx

@@ -0,0 +1,32 @@
+import { type ComponentPropsWithoutRef, forwardRef } from 'react'
+import { Plus } from '../../icons/plus'
+import { cn } from '../../lib/cn'
+import { Button } from '../button/button'
+
+export type AddRowButtonProps = ComponentPropsWithoutRef<'button'>
+
+/**
+ * Full-width dashed action for adding the first row to an empty editor list.
+ * Keeps the existing 28px filter/sort treatment; list state stays with the caller.
+ * Forwards native button props and refs, preserving Button's native form behavior.
+ *
+ * @example <AddRowButton onClick={addRule}>Add filter condition</AddRowButton>
+ */
+export const AddRowButton = forwardRef<HTMLButtonElement, AddRowButtonProps>(
+  ({ children, className, ...props }, ref) => (
+    <Button
+      {...props}
+      ref={ref}
+      variant='ghost'
+      className={cn(
+        'h-7 w-full justify-start gap-1.5 border border-[var(--border-1)] border-dashed text-[var(--text-muted)] text-small',
+        className
+      )}
+    >
+      <Plus className='size-[14px]' />
+      {children}
+    </Button>
+  )
+)
+
+AddRowButton.displayName = 'AddRowButton'

packages/emcn/src/components/index.ts

@@ -1,3 +1,4 @@
+export { AddRowButton, type AddRowButtonProps } from './add-row-button/add-row-button'
 export { Avatar, AvatarFallback, AvatarImage } from './avatar/avatar'
 export { Badge, type BadgeProps } from './badge/badge'
 export { Banner } from './banner/banner'