feat(frontend): schedule history dialog with rollback, wire ConfigHistorySheet

k-tv-frontend/app/(main)/dashboard/components/edit-channel-sheet.tsx

@@ -15,6 +15,7 @@ import { RecyclePolicyEditor } from "./recycle-policy-editor";
 import { WebhookEditor } from "./webhook-editor";
 import { AccessSettingsEditor } from "./access-settings-editor";
 import { LogoEditor } from "./logo-editor";
+import { ConfigHistorySheet } from "./config-history-sheet";
 import { useChannelForm } from "@/hooks/use-channel-form";
 import { channelFormSchema, extractErrors } from "@/lib/schemas";
 import type { FieldErrors } from "@/lib/schemas";
@@ -748,7 +749,13 @@ export function EditChannelSheet({
               </Button>
             </div>
           </div>
-          {/* TODO: ConfigHistorySheet — wired in Task 16 */}
+          {channel && (
+            <ConfigHistorySheet
+              channelId={channel.id}
+              open={configHistoryOpen}
+              onOpenChange={setConfigHistoryOpen}
+            />
+          )}
         </form>
       </SheetContent>
     </Sheet>