feat(web,hub): cancel queued messages (#568)

web/src/api/client.ts

@@ -25,6 +25,7 @@ import type {
     SessionResponse,
     SessionsResponse
 } from '@/types/api'
+import type { CancelMessageResponse } from '@hapi/protocol/schemas'
 
 type ApiClientOptions = {
     baseUrl?: string
@@ -307,6 +308,14 @@ export class ApiClient {
         })
     }
 
+    async cancelMessage(sessionId: string, messageId: string): Promise<CancelMessageResponse> {
+        const response = await this.request(
+            `/api/sessions/${encodeURIComponent(sessionId)}/messages/${encodeURIComponent(messageId)}`,
+            { method: 'DELETE' }
+        )
+        return response as CancelMessageResponse
+    }
+
     async abortSession(sessionId: string): Promise<void> {
         await this.request(`/api/sessions/${encodeURIComponent(sessionId)}/abort`, {
             method: 'POST',