refactor(errors): migrate decisions to {code,msg}

app/(order)/dispute/[id]/page.tsx

@@ -112,7 +112,7 @@ export default function DisputePage({ params }: { params: Promise<{ id: string }
       evidence: files,
     })
     if (!result.decision.ok) {
-      notifyInfo(result.decision.message ?? "提交争议失败")
+      notifyInfo(result.decision.error.msg)
       return
     }
     router.replace(`/dispute/${id}?submitted=1`)
@@ -288,7 +288,7 @@ export default function DisputePage({ params }: { params: Promise<{ id: string }
                         evidence: responseFiles,
                       })
                       if (!decision.ok) {
-                        notifyInfo(decision.message ?? "提交回应失败")
+                        notifyInfo(decision.error.msg)
                       }
                     }}
                     disabled={!responseReason.trim()}
@@ -336,7 +336,7 @@ export default function DisputePage({ params }: { params: Promise<{ id: string }
                         reason: appealReason,
                       })
                       if (!decision.ok) {
-                        notifyInfo(decision.message ?? "提交申诉失败")
+                        notifyInfo(decision.error.msg)
                       }
                     }}
                     disabled={!appealReason.trim()}