feat(22-03): extend ChatMessage with inline edit mode and action callbacks

- Add id, isAnyStreaming, onEdit, onRetry props to ChatMessageProps
- User messages show edit Pencil on hover via ChatMessageActions
- Edit pencil opens inline textarea with Save/Discard buttons
- Save edit calls onEdit(id, newContent), disabled when textarea empty
- Discard edit reverts to read-only bubble
- Assistant messages show retry RefreshCw via ChatMessageActions
- All edit/retry actions disabled when isAnyStreaming is true
- Update test stubs to reflect new prop surface

ui/src/components/ChatMessage.test.tsx

@@ -1,12 +1,20 @@
-import { describe, it } from "vitest";
+// @vitest-environment jsdom
+import { describe, it, expect } from "vitest";
 
 describe("ChatMessage", () => {
+  it("exports ChatMessage component", async () => {
+    const mod = await import("./ChatMessage");
+    expect(mod.ChatMessage).toBeDefined();
+  });
+
   it.todo("renders user message as right-aligned bubble with plain text");
   it.todo("renders assistant message with ChatMarkdownMessage");
   it.todo("renders ChatMessageIdentityBar for assistant messages when agentName is provided");
   it.todo("shows edit pencil on hover for user messages");
   it.todo("shows retry button on hover for assistant messages");
-  it.todo("hides retry button when isStreaming is true");
+  it.todo("hides retry button when isAnyStreaming is true");
   it.todo("switches to inline edit textarea on pencil click");
   it.todo("renders ChatStreamingCursor when isStreaming is true");
+  it.todo("Save edit button disabled when edit textarea is empty");
+  it.todo("Discard edit reverts to read-only bubble");
 });

ui/src/components/ChatMessage.tsx

@@ -1,10 +1,14 @@
+import { useState } from "react";
 import { ChatMarkdownMessage } from "./ChatMarkdownMessage";
 import { ChatMessageIdentityBar } from "./ChatMessageIdentityBar";
 import { ChatStreamingCursor } from "./ChatStreamingCursor";
+import { ChatMessageActions } from "./ChatMessageActions";
+import { Button } from "@/components/ui/button";
 import { cn } from "../lib/utils";
 import type { AgentRole } from "@paperclipai/shared";
 
 interface ChatMessageProps {
+  id?: string;
   role: "user" | "assistant" | "system";
   content: string;
   agentName?: string | null;
@@ -12,9 +16,13 @@ interface ChatMessageProps {
   agentRole?: AgentRole | null;
   timestamp?: string;
   isStreaming?: boolean;
+  isAnyStreaming?: boolean;
+  onEdit?: (messageId: string, newContent: string) => void;
+  onRetry?: (messageId: string) => void;
 }
 
 export function ChatMessage({
+  id,
   role,
   content,
   agentName,
@@ -22,20 +30,73 @@ export function ChatMessage({
   agentRole,
   timestamp,
   isStreaming,
+  isAnyStreaming,
+  onEdit,
+  onRetry,
 }: ChatMessageProps) {
+  const [isEditing, setIsEditing] = useState(false);
+  const [editValue, setEditValue] = useState(content);
+
   if (role === "user") {
+    if (isEditing) {
+      return (
+        <div className="flex justify-end">
+          <div className="max-w-[85%] w-full">
+            <textarea
+              value={editValue}
+              onChange={(e) => setEditValue(e.target.value)}
+              className="w-full rounded-md border border-input bg-transparent px-3 py-2 text-sm resize-none min-h-[40px] focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring"
+              aria-label="Edit your message"
+              rows={3}
+            />
+            <div className="flex justify-end gap-2 mt-1">
+              <Button
+                variant="ghost"
+                size="sm"
+                onClick={() => {
+                  setIsEditing(false);
+                  setEditValue(content);
+                }}
+              >
+                Discard edit
+              </Button>
+              <Button
+                variant="default"
+                size="sm"
+                disabled={!editValue.trim()}
+                onClick={() => {
+                  if (id && onEdit && editValue.trim()) {
+                    onEdit(id, editValue.trim());
+                    setIsEditing(false);
+                  }
+                }}
+              >
+                Save edit
+              </Button>
+            </div>
+          </div>
+        </div>
+      );
+    }
+
     return (
       <div className="flex justify-end">
         <div
           className={cn(
-            "max-w-[85%] rounded-lg bg-secondary px-3 py-2 text-secondary-foreground text-sm",
+            "relative group max-w-[85%] rounded-lg bg-secondary px-3 py-2 text-secondary-foreground text-sm",
           )}
         >
           {content}
+          <ChatMessageActions
+            role="user"
+            isStreaming={isAnyStreaming}
+            onEdit={() => setIsEditing(true)}
+          />
         </div>
       </div>
     );
   }
+
   // assistant or system
   return (
     <div className="max-w-full group relative">
@@ -50,6 +111,11 @@ export function ChatMessage({
       )}
       <ChatMarkdownMessage content={content} />
       {isStreaming && <ChatStreamingCursor />}
+      <ChatMessageActions
+        role="assistant"
+        isStreaming={isAnyStreaming}
+        onRetry={id && onRetry ? () => onRetry(id) : undefined}
+      />
     </div>
   );
 }