refactor(workflow-editor): remove the dead Copilot diff overlay

The workflow diff store (proposed changes, accept/reject, baseline snapshot
view) was fed only by the legacy workflow panel's Copilot tab, which called
setProposedChanges after a successful edit_workflow tool result. That panel
and its DiffControls were deleted in the Platform cutover, and nothing else
produces a diff: edit_workflow persists on the server and announces the
change through realtime and the mothership resource event, which the canvas
reconciles by reloading. Every reader of the diff flags was therefore always
false.

Removes the diff overlay state and engine, the diff undo/redo operations and
their protocol constants, the replace-state enqueue helper, the accept-diff
command, the snapshot-view branches in the canvas, edges, blocks, editor,
search-replace and output options, and the deploy "reviewing-diff" status.
The external-update reconciliation bookkeeping that lived in the same store
moves to stores/workflow-reconciliation, and applyWorkflowStateToStores to
stores/workflows/apply-state.

Author: waleedlatif1

.claude/rules/sim-url-state.md

@@ -267,7 +267,6 @@ The workflow editor (`apps/sim/app/(product)/workspace/[workspaceId]/workflows/*
 - **Live cursor** and **broadcast live selection** (presence; emitted over the socket, throttled).
 - **Pan / zoom / viewport** (ReactFlow-owned, continuous, not persisted).
 - **Drag state** and **resize widths/heights** (panel/terminal/sidebar — high-frequency, persisted as local preferences).
-- **Ephemeral diff staging** (`hasActiveDiff`, `baselineWorkflow`, `diffAnalysis`).
 
 Borderline candidates that *look* shareable but currently stay in Zustand because moving them fights existing machinery:
 

.cursor/rules/sim-url-state.mdc

@@ -260,7 +260,6 @@ The workflow editor (`apps/sim/app/(product)/workspace/[workspaceId]/workflows/*
 - **Live cursor** and **broadcast live selection** (presence; emitted over the socket, throttled).
 - **Pan / zoom / viewport** (ReactFlow-owned, continuous, not persisted).
 - **Drag state** and **resize widths/heights** (panel/terminal/sidebar — high-frequency, persisted as local preferences).
-- **Ephemeral diff staging** (`hasActiveDiff`, `baselineWorkflow`, `diffAnalysis`).
 
 Borderline candidates that *look* shareable but currently stay in Zustand because moving them fights existing machinery:
 

apps/sim/app/(product)/_components/workspace/workflows/canvas/block-visual/use-block-visual.ts

@@ -11,17 +11,16 @@ import {
 
 /**
  * The ring a block card paints, in legacy priority order: the neutral selection ring (editor open,
- * selected, or preview selection), then pending, deleted and the copilot diff states. Each card's
- * CSS paints it from `data-ring` with the legacy 1.5px ring.
+ * selected, or preview selection), then pending. Subflow containers also take the status rings for
+ * version-comparison diffs and preview run outcomes. Each card's CSS paints it from `data-ring` with
+ * the legacy 1.5px ring.
  */
 export type BlockRing = 'selected' | 'pending' | 'deleted' | 'new' | 'edited'
 
 interface BlockRingOptions {
   isExecuting: boolean
   isEditorOpen: boolean
   isPending: boolean
-  isDeletedBlock: boolean
-  diffStatus: 'new' | 'edited' | null | undefined
   isPreviewSelection?: boolean
   isSelected?: boolean
 }
@@ -31,17 +30,12 @@ function blockRing({
   isExecuting,
   isEditorOpen,
   isPending,
-  isDeletedBlock,
-  diffStatus,
   isPreviewSelection,
   isSelected,
 }: BlockRingOptions): BlockRing | null {
   if (isEditorOpen || isSelected || isPreviewSelection) return 'selected'
   if (isExecuting) return null
   if (isPending) return 'pending'
-  if (isDeletedBlock) return 'deleted'
-  if (diffStatus === 'new') return 'new'
-  if (diffStatus === 'edited') return 'edited'
   return null
 }
 
@@ -73,8 +67,6 @@ export function useBlockVisual({
   const {
     isEnabled,
     isActive: isExecuting,
-    diffStatus,
-    isDeletedBlock,
     isLocked,
   } = useBlockState(blockId, currentWorkflow, data)
 
@@ -105,22 +97,10 @@ export function useBlockVisual({
         isExecuting: isPreview ? false : isExecuting,
         isEditorOpen: isPreview ? isPreviewSelected : isEditorOpen,
         isPending: isPreview ? false : isPending,
-        isDeletedBlock: isPreview ? false : isDeletedBlock,
-        diffStatus: isPreview ? undefined : diffStatus,
         isPreviewSelection: isPreview && isPreviewSelected,
         isSelected: isPreview || isEmbedded ? false : isSelected,
       }),
-    [
-      isExecuting,
-      isEditorOpen,
-      isPending,
-      isDeletedBlock,
-      diffStatus,
-      isPreview,
-      isEmbedded,
-      isPreviewSelected,
-      isSelected,
-    ]
+    [isExecuting, isEditorOpen, isPending, isPreview, isEmbedded, isPreviewSelected, isSelected]
   )
 
   return {

apps/sim/app/(product)/_components/workspace/workflows/canvas/subflow-node/subflow-node.tsx

@@ -46,10 +46,8 @@ import {
   Ban,
   BLOCK_DIMENSIONS,
   CONTAINER_DIMENSIONS,
-  type DiffStatus,
   getWorkflowSubflowHandleIds,
   HANDLE_POSITIONS,
-  hasDiffStatus,
   Lock,
   Repeat,
   Split,
@@ -88,6 +86,9 @@ export interface SubflowNodeData extends Record<string, unknown> {
  * in. The editor-only action bar is injected via the `actionBar` slot so the
  * pure renderer carries no store, socket, or permission coupling.
  */
+/** A container's change in a version comparison. */
+type SubflowDiffStatus = 'new' | 'edited' | undefined
+
 interface SubflowNodeViewProps {
   id: string
   data: SubflowNodeData
@@ -102,7 +103,7 @@ interface SubflowNodeViewProps {
   /** Whether this subflow participates in the current execution handoff. */
   isExecutionHighlighted?: boolean
   /** Diff state when comparing workflow versions. */
-  diffStatus?: DiffStatus
+  diffStatus?: SubflowDiffStatus
   /** Depth in the parent container hierarchy (drives nesting styling). */
   nestingLevel: number
   canEditWorkflow: boolean
@@ -329,7 +330,7 @@ function SubflowStartView({
  */
 function getSubflowRing(
   isNodeSelected: boolean,
-  diffStatus: DiffStatus,
+  diffStatus: SubflowDiffStatus,
   previewRunStatus: SubflowNodeData['executionStatus']
 ): BlockRing | null {
   if (isNodeSelected) return 'selected'
@@ -722,7 +723,7 @@ type SubflowNode = Node<SubflowNodeData, 'subflowNode'>
 /**
  * Editor container for the loop/parallel node.
  *
- * Resolves the subflow's enabled/locked/focus/diff/run state from the editor
+ * Resolves the subflow's enabled/locked/focus/run state from the editor
  * stores, computes its nesting depth from the ReactFlow node tree, and renders
  * the legacy container pixels — injecting the editor-only {@link ActionBar}.
  */
@@ -733,10 +734,6 @@ export const SubflowNodeComponent = memo(({ data, id, selected }: NodeProps<Subf
 
   const currentWorkflow = useCurrentWorkflow()
   const currentBlock = currentWorkflow.getBlockById(id)
-  const diffStatus =
-    currentWorkflow.isDiffMode && currentBlock && hasDiffStatus(currentBlock)
-      ? currentBlock.is_diff
-      : undefined
 
   const isEnabled = currentBlock?.enabled ?? true
   const isLocked = currentBlock?.locked ?? false
@@ -784,7 +781,6 @@ export const SubflowNodeComponent = memo(({ data, id, selected }: NodeProps<Subf
       isFocused={isFocused}
       isRunning={isRunning}
       isExecutionHighlighted={isExecutionHighlighted}
-      diffStatus={diffStatus}
       nestingLevel={nestingLevel}
       canEditWorkflow={canEditWorkflow}
       onSelect={() => setCurrentBlockId(id)}

apps/sim/app/(product)/_components/workspace/workflows/canvas/workflow-block/workflow-block.tsx

@@ -198,16 +198,9 @@ function migrationPrompt(name: string, target: BlockConfig): string {
  * Sunset state for a placed block: the block type itself (via `config.sunset`)
  * or its selected model. `legacy` (amber) is superseded-but-supported and needs
  * a resolvable successor; `deprecated` (red) is no longer supported and badges
- * with or without one. `null` when neither applies or in diff mode.
+ * with or without one. `null` when neither applies.
  */
-function getBlockSunset(
-  config: BlockConfig,
-  name: string,
-  model: unknown,
-  isDiffMode: boolean
-): BlockSunset | null {
-  if (isDiffMode) return null
-
+function getBlockSunset(config: BlockConfig, name: string, model: unknown): BlockSunset | null {
   const sunset = config.sunset
   if (sunset) {
     const target = sunset.replacedBy ? getBlock(sunset.replacedBy) : undefined
@@ -671,13 +664,7 @@ export const WorkflowBlock = memo(function WorkflowBlock({
   const currentBlock = currentWorkflow.getBlockById(id)
 
   const { horizontalHandles, blockHeight, blockWidth, displayAdvancedMode, displayTriggerMode } =
-    useBlockProperties(
-      id,
-      currentWorkflow.isDiffMode,
-      data.isPreview ?? false,
-      data.blockState,
-      currentWorkflow.blocks
-    )
+    useBlockProperties(id, data.isPreview ?? false, data.blockState)
 
   const {
     isWebhookConfigured,
@@ -817,7 +804,7 @@ export const WorkflowBlock = memo(function WorkflowBlock({
 
   const posthog = usePostHog()
 
-  const sunset = getBlockSunset(config, name, blockSubBlockValues.model, currentWorkflow.isDiffMode)
+  const sunset = getBlockSunset(config, name, blockSubBlockValues.model)
 
   const onFixSunset = () => {
     if (!sunset) return
@@ -936,7 +923,6 @@ export const WorkflowBlock = memo(function WorkflowBlock({
     displayTriggerMode,
     data.isPreview,
     data.subBlockValues,
-    currentWorkflow.isDiffMode,
     currentBlock,
     canonicalModeOverrides,
     canEditWorkflow,