fix(ui): sync delete-hover overlays across preview and stream

packages/ui/src/components/message-block.tsx

@@ -199,6 +199,7 @@ interface MessageContentItemProps {
   onFork?: (messageId?: string) => void
   onContentRendered?: () => void
   showDeleteMessage?: boolean
+  deleteHover?: () => DeleteHoverState
   onDeleteHoverChange?: (state: DeleteHoverState) => void
 }
 
@@ -287,6 +288,7 @@ function MessageContentItem(props: MessageContentItemProps) {
           isQueued={isQueued()}
           showAgentMeta={showAgentMeta()}
           showDeleteMessage={props.showDeleteMessage}
+          deleteHover={props.deleteHover}
           onDeleteHoverChange={props.onDeleteHoverChange}
           onRevert={props.onRevert}
           onFork={props.onFork}
@@ -305,6 +307,7 @@ interface ToolCallItemProps {
   partId: string
   onContentRendered?: () => void
   showDeleteMessage?: boolean
+  deleteHover?: () => DeleteHoverState
   onDeleteHoverChange?: (state: DeleteHoverState) => void
 }
 
@@ -401,10 +404,18 @@ function ToolCallItem(props: ToolCallItemProps) {
     }
   }
 
+  const isDeleteHoveredFromStore = () => {
+    const hover = props.deleteHover?.() ?? ({ kind: "none" } as DeleteHoverState)
+    return hover.kind === "part" && hover.messageId === props.messageId && hover.partId === props.partId
+  }
+
   return (
     <Show when={toolPart()}>
       {(resolvedToolPart) => (
-        <div class="delete-hover-scope" data-delete-part-hover={hoverDeletePart() ? "true" : undefined}>
+        <div
+          class="delete-hover-scope"
+          data-delete-part-hover={(hoverDeletePart() || isDeleteHoveredFromStore()) ? "true" : undefined}
+        >
           <div class="tool-call-header-label">
             <div class="tool-call-header-meta">
               <span class="tool-call-icon">{TOOL_ICON}</span>
@@ -747,6 +758,7 @@ export default function MessageBlock(props: MessageBlockProps) {
                     messageIndex={props.messageIndex}
                     lastAssistantIndex={props.lastAssistantIndex}
                     showDeleteMessage={index() === 0}
+                    deleteHover={props.deleteHover}
                     onDeleteHoverChange={props.onDeleteHoverChange}
                     onRevert={props.onRevert}
                     onFork={props.onFork}
@@ -765,6 +777,7 @@ export default function MessageBlock(props: MessageBlockProps) {
                           messageId={toolItem.messageId}
                           partId={toolItem.partId}
                           showDeleteMessage={index() === 0}
+                          deleteHover={props.deleteHover}
                           onDeleteHoverChange={props.onDeleteHoverChange}
                           onContentRendered={props.onContentRendered}
                         />
@@ -809,6 +822,7 @@ export default function MessageBlock(props: MessageBlockProps) {
                     messageId={(item as CompactionDisplayItem).messageId}
                     partId={(item as CompactionDisplayItem).partId}
                     showDeleteMessage={index() === 0}
+                    deleteHover={props.deleteHover}
                     onDeleteHoverChange={props.onDeleteHoverChange}
                   />
                 </Match>
@@ -823,6 +837,7 @@ export default function MessageBlock(props: MessageBlockProps) {
                     showAgentMeta={(item as ReasoningDisplayItem).showAgentMeta}
                     defaultExpanded={(item as ReasoningDisplayItem).defaultExpanded}
                     showDeleteMessage={index() === 0}
+                    deleteHover={props.deleteHover}
                     onDeleteHoverChange={props.onDeleteHoverChange}
                   />
                 </Match>
@@ -858,6 +873,7 @@ interface CompactionCardProps {
   messageId: string
   partId: string
   showDeleteMessage?: boolean
+  deleteHover?: () => DeleteHoverState
   onDeleteHoverChange?: (state: DeleteHoverState) => void
 }
 
@@ -914,10 +930,15 @@ function CompactionCard(props: CompactionCardProps) {
     }
   }
 
+  const isDeleteHoveredFromStore = () => {
+    const hover = props.deleteHover?.() ?? ({ kind: "none" } as DeleteHoverState)
+    return hover.kind === "part" && hover.messageId === props.messageId && hover.partId === props.partId
+  }
+
   return (
     <div
       class={`delete-hover-scope ${containerClass()} relative`}
-      data-delete-part-hover={hoverDeletePart() ? "true" : undefined}
+      data-delete-part-hover={(hoverDeletePart() || isDeleteHoveredFromStore()) ? "true" : undefined}
       style={{ "border-left": `4px solid ${borderColor()}` }}
       role="status"
       aria-label={t("messageBlock.compaction.ariaLabel")}
@@ -1120,6 +1141,7 @@ interface ReasoningCardProps {
   showAgentMeta?: boolean
   defaultExpanded?: boolean
   showDeleteMessage?: boolean
+  deleteHover?: () => DeleteHoverState
   onDeleteHoverChange?: (state: DeleteHoverState) => void
 }
 
@@ -1130,6 +1152,11 @@ function ReasoningCard(props: ReasoningCardProps) {
   const [deletingMessage, setDeletingMessage] = createSignal(false)
   const [hoverDeletePart, setHoverDeletePart] = createSignal(false)
 
+  const isDeleteHoveredFromStore = () => {
+    const hover = props.deleteHover?.() ?? ({ kind: "none" } as DeleteHoverState)
+    return hover.kind === "part" && hover.messageId === props.messageId && hover.partId === props.partId
+  }
+
   createEffect(() => {
     setExpanded(Boolean(props.defaultExpanded))
   })
@@ -1238,7 +1265,10 @@ function ReasoningCard(props: ReasoningCardProps) {
   }
 
   return (
-    <div class="delete-hover-scope message-reasoning-card" data-delete-part-hover={hoverDeletePart() ? "true" : undefined}>
+    <div
+      class="delete-hover-scope message-reasoning-card"
+      data-delete-part-hover={(hoverDeletePart() || isDeleteHoveredFromStore()) ? "true" : undefined}
+    >
       <div class="message-reasoning-header">
         <button
           type="button"

packages/ui/src/components/message-item.tsx

@@ -23,6 +23,7 @@ interface MessageItemProps {
   showAgentMeta?: boolean
   onContentRendered?: () => void
   showDeleteMessage?: boolean
+  deleteHover?: () => DeleteHoverState
   onDeleteHoverChange?: (state: DeleteHoverState) => void
 }
 
@@ -33,6 +34,11 @@ export default function MessageItem(props: MessageItemProps) {
   const [deletingMessage, setDeletingMessage] = createSignal(false)
   const [hoveredDeletePartId, setHoveredDeletePartId] = createSignal<string | null>(null)
 
+  const isDeleteHoveredFromStore = (partId: string) => {
+    const hover = props.deleteHover?.() ?? ({ kind: "none" } as DeleteHoverState)
+    return hover.kind === "part" && hover.messageId === props.record.id && hover.partId === partId
+  }
+
   const isUser = () => props.record.role === "user"
   const createdTimestamp = () => props.messageInfo?.time?.created ?? props.record.createdAt
 
@@ -447,7 +453,8 @@ export default function MessageItem(props: MessageItemProps) {
         <For each={messageParts()}>
           {(part) => {
             const partId = typeof (part as any)?.id === "string" ? ((part as any).id as string) : ""
-            const isHoveredDeleteTarget = () => Boolean(partId) && hoveredDeletePartId() === partId
+            const isHoveredDeleteTarget = () =>
+              Boolean(partId) && (hoveredDeletePartId() === partId || isDeleteHoveredFromStore(partId))
 
             return (
               <div
@@ -474,7 +481,8 @@ export default function MessageItem(props: MessageItemProps) {
               {(attachment) => {
                 const name = getAttachmentName(attachment)
                 const isImage = isImageAttachment(attachment)
-                const isHoveredDeleteTarget = () => hoveredDeletePartId() === attachment.id
+                const isHoveredDeleteTarget = () =>
+                  Boolean(attachment.id) && (hoveredDeletePartId() === attachment.id || isDeleteHoveredFromStore(attachment.id))
                 return (
                   <div
                     class={`delete-hover-scope attachment-chip ${isImage ? "attachment-chip-image" : ""}`}

packages/ui/src/components/message-preview.tsx

@@ -1,12 +1,15 @@
 import type { Component } from "solid-js"
 import MessageBlock from "./message-block"
 import type { InstanceMessageStore } from "../stores/message-v2/instance-store"
+import type { DeleteHoverState } from "../types/delete-hover"
 
 interface MessagePreviewProps {
   instanceId: string
   sessionId: string
   messageId: string
   store: () => InstanceMessageStore
+  deleteHover?: () => DeleteHoverState
+  onDeleteHoverChange?: (state: DeleteHoverState) => void
 }
 
 const MessagePreview: Component<MessagePreviewProps> = (props) => {
@@ -24,6 +27,8 @@ const MessagePreview: Component<MessagePreviewProps> = (props) => {
         showThinking={() => false}
         thinkingDefaultExpanded={() => false}
         showUsageMetrics={() => false}
+        deleteHover={props.deleteHover}
+        onDeleteHoverChange={props.onDeleteHoverChange}
       />
     </div>
   )

packages/ui/src/components/message-section.tsx

@@ -963,6 +963,7 @@ export default function MessageSection(props: MessageSectionProps) {
               sessionId={props.sessionId}
               showToolSegments={showTimelineToolsPreference()}
               deleteHover={deleteHover}
+              onDeleteHoverChange={setDeleteHover}
             />
           </div>
         </Show>

packages/ui/src/components/message-timeline.tsx

@@ -32,6 +32,7 @@ interface MessageTimelineProps {
   sessionId: string
   showToolSegments?: boolean
   deleteHover?: () => DeleteHoverState
+  onDeleteHoverChange?: (state: DeleteHoverState) => void
 }
 
 const MAX_TOOLTIP_LENGTH = 220
@@ -497,6 +498,8 @@ const MessageTimeline: Component<MessageTimelineProps> = (props) => {
                 instanceId={props.instanceId}
                 sessionId={props.sessionId}
                 store={store}
+                deleteHover={props.deleteHover}
+                onDeleteHoverChange={props.onDeleteHoverChange}
               />
             </div>
           )