feat(FN-4739): complete Step 6 — intercept room clear slash commands

Fusion-Task-Id: FN-4739
Fusion-Task-Lineage: fc120dfa-d1b2-4065-9595-d0bc6304d2af

packages/dashboard/app/components/ChatView.tsx

@@ -1678,6 +1678,16 @@ export function ChatView({ projectId, addToast, experimentalFeatures }: ChatView
         return;
       }
 
+      if (trimmed === "/clear" || trimmed === "/new") {
+        clearComposerState();
+        try {
+          await rooms.clearRoom(rooms.activeRoom.id);
+        } catch {
+          addToast("Failed to clear room conversation", "error");
+        }
+        return;
+      }
+
       const previousInput = messageInput;
       clearComposerState();
 
@@ -1694,7 +1704,7 @@ export function ChatView({ projectId, addToast, experimentalFeatures }: ChatView
     }
 
     handleSend();
-  }, [messageInput, chatRoomsEnabled, chatScope, rooms, clearComposerState, addToast, handleSend]);
+  }, [messageInput, chatRoomsEnabled, chatScope, rooms, rooms.clearRoom, clearComposerState, addToast, handleSend]);
 
   const handleSkillSelect = useCallback(
     (skill: DiscoveredSkill) => {

packages/dashboard/app/components/__tests__/ChatView.rooms.test.tsx

@@ -90,6 +90,7 @@ const defaultRoomsState: UseChatRoomsResult = {
   createRoom: vi.fn(),
   deleteRoom: vi.fn(),
   sendRoomMessage: vi.fn(),
+  clearRoom: vi.fn(),
   refreshRooms: vi.fn(),
 };
 
@@ -379,6 +380,69 @@ describe("ChatView — rooms (FN-3805..FN-3811 contract)", () => {
     });
   });
 
+  it("intercepts exact /clear in rooms scope and clears active room", async () => {
+    const clearRoom = vi.fn().mockResolvedValue(undefined);
+    const sendRoomMessage = vi.fn().mockResolvedValue(undefined);
+    setup({}, { clearRoom, sendRoomMessage, activeRoom: roomA });
+
+    render(<ChatView projectId="proj-123" addToast={vi.fn()} experimentalFeatures={{ chatRooms: true }} />);
+
+    const textarea = screen.getByTestId("chat-input") as HTMLTextAreaElement;
+    await userEvent.type(textarea, "  /clear  {enter}");
+
+    await waitFor(() => {
+      expect(clearRoom).toHaveBeenCalledWith("room-a");
+    });
+    expect(sendRoomMessage).not.toHaveBeenCalled();
+  });
+
+  it("intercepts exact /new in rooms scope and clears active room", async () => {
+    const clearRoom = vi.fn().mockResolvedValue(undefined);
+    const sendRoomMessage = vi.fn().mockResolvedValue(undefined);
+    setup({}, { clearRoom, sendRoomMessage, activeRoom: roomA });
+
+    render(<ChatView projectId="proj-123" addToast={vi.fn()} experimentalFeatures={{ chatRooms: true }} />);
+
+    const textarea = screen.getByTestId("chat-input") as HTMLTextAreaElement;
+    await userEvent.type(textarea, "  /new  {enter}");
+
+    await waitFor(() => {
+      expect(clearRoom).toHaveBeenCalledWith("room-a");
+    });
+    expect(sendRoomMessage).not.toHaveBeenCalled();
+  });
+
+  it("does not intercept /clear substring commands in rooms scope", async () => {
+    const clearRoom = vi.fn().mockResolvedValue(undefined);
+    const sendRoomMessage = vi.fn().mockResolvedValue(undefined);
+    setup({}, { clearRoom, sendRoomMessage, activeRoom: roomA });
+
+    render(<ChatView projectId="proj-123" addToast={vi.fn()} experimentalFeatures={{ chatRooms: true }} />);
+
+    const textarea = screen.getByTestId("chat-input") as HTMLTextAreaElement;
+    await userEvent.type(textarea, "/clear now{enter}");
+
+    await waitFor(() => {
+      expect(sendRoomMessage).toHaveBeenCalledWith("/clear now");
+    });
+    expect(clearRoom).not.toHaveBeenCalled();
+  });
+
+  it("toasts error when room clear command fails", async () => {
+    const addToast = vi.fn();
+    const clearRoom = vi.fn().mockRejectedValue(new Error("clear failed"));
+    setup({}, { clearRoom, activeRoom: roomA });
+
+    render(<ChatView projectId="proj-123" addToast={addToast} experimentalFeatures={{ chatRooms: true }} />);
+
+    const textarea = screen.getByTestId("chat-input") as HTMLTextAreaElement;
+    await userEvent.type(textarea, "/clear{enter}");
+
+    await waitFor(() => {
+      expect(addToast).toHaveBeenCalledWith("Failed to clear room conversation", "error");
+    });
+  });
+
   it("supports delete-room confirm/cancel and rerenders messages from hook state", async () => {
     const deleteRoom = vi.fn().mockResolvedValue(undefined);
     const rerenderedRooms = {