fix(pda): prevent stale and ambiguous dispatch scan selections

src/pages/dispatch/dispatch.vue

@@ -5,14 +5,14 @@
 			<view class="portal-content fulfillment-content">
 				<view class="fulfillment-heading">
 					<text class="fulfillment-title">排车拣货与发车</text>
-					<text class="fulfillment-subtitle">客户与当前海外仓由登录令牌和服务端确定；扫描排车单号或任务中的托盘码开始作业</text>
+					<text class="fulfillment-subtitle">扫描排车单号打开任务，再扫描任务中的托盘码进行拣货</text>
 				</view>
 				<view v-if="current" class="detail-toolbar"><view><text class="detail-kicker">当前任务</text><text class="detail-title">排车拣货详情</text></view><button :disabled="busy" @tap="closeTask">‹ 返回列表</button></view>
 
 				<view class="fulfillment-card">
 					<ScanTargetInput name="dispatch" :model-value="scanCode" label="排车单号 / 托盘码 / 来源箱唛" placeholder="扫描排车单号、托盘码或退货箱唛" :active="true" @update:modelValue="updateScanCode" @submit="handleScan" />
 					<button class="secondary-button" :disabled="!scanCode || loading || busy" @tap="handleScan(scanCode)">{{ current ? '匹配托盘' : '打开排车任务' }}</button>
-					<text class="scan-help">网络失败不会清空草稿，再次提交会沿用同一幂等键。</text>
+					<text class="scan-help">网络中断会保留当前作业，恢复后可重试。</text>
 				</view>
 
 				<view v-if="loading" class="fulfillment-state"><text>正在加载排车任务…</text></view>
@@ -21,7 +21,7 @@
 					<text v-if="error.code">错误码：{{ error.code }}</text>
 					<text v-if="error.requestId">requestId：{{ error.requestId }}</text>
 					<text v-if="error.traceId">traceId：{{ error.traceId }}</text>
-					<text v-if="error.network" class="offline-note">网络连接失败，未完成作业与幂等键已保留。</text>
+					<text v-if="error.network" class="offline-note">网络连接失败，当前作业已保留，请恢复网络后重试。</text>
 					<button class="secondary-button" :disabled="loading || busy" @tap="retry">重试</button>
 				</view>
 
@@ -154,17 +154,21 @@
 				const code = String(raw?.detail?.value ?? raw ?? this.scanCode).trim(); if (!code || this.busy || this.loading) return
 				console.info('[Overseas PDA dispatch] scan', { code, task: this.current?.dispatchNo || '' })
 				this.scanCode = code
+				this.error = null; this.successMessage = ''
+				updateFulfillmentDraft('dispatch', { palletCode: '', dispatchItemId: '', cartonCode: '', packages: 1 })
 				if (!this.current || code === this.current.dispatchNo || code === this.current.taskNo) return this.openTask(code === this.current?.taskNo ? this.current.dispatchNo : code)
 				const cartonItem = this.current.items.find((item) => item.returnCartons?.some((carton) => carton.cartonMark === code))
 				if (cartonItem) {
 					if (cartonItem.returnCartons.find((carton) => carton.cartonMark === code)?.status !== 'OUTBOUND_PENDING') return this.setError(new Error('该箱已拣货或不可出库'), '扫码未匹配')
 					this.selectPallet(cartonItem); updateFulfillmentDraft('dispatch', { cartonCode: code, packages: 1 }); this.scanCode = ''; playSuccessSound(); return
 				}
-				const item = this.current.items.find((value) => [value.palletNo, value.fbaWarehouseCode].includes(code))
-				if (!item) return this.setError(new Error('扫码未匹配当前排车任务的托盘或稳定业务码'), '扫码未匹配')
+				const matches = this.current.items.filter((value) => value.palletNo === code && value.scheduledPackages > value.pickedPackages)
+				if (matches.length > 1) return this.setError(new Error('此托盘包含多条待拣明细，请选择对应货物卡片'), '请选择拣货明细')
+				const item = matches[0]
+				if (!item) return this.setError(new Error(this.current.items.some((value) => value.palletNo === code) ? '该托盘已完成拣货，请勿重复操作' : '扫码未匹配当前任务的托盘码或来源箱唛'), '扫码未匹配')
 				this.selectPallet(item); this.scanCode = ''; playSuccessSound()
 			},
-			selectPallet(item) { if (!item?.palletNo || item.scheduledPackages <= item.pickedPackages) return; updateFulfillmentDraft('dispatch', { palletCode: item.palletNo, dispatchItemId: item.dispatchItemId, cartonCode: '', packages: Math.max(1, Math.min(item.scheduledPackages - item.pickedPackages, item.positions?.[0]?.availablePackages || 1)) }) },
+			selectPallet(item) { if (!item?.palletNo || item.scheduledPackages <= item.pickedPackages) return; this.error = null; this.successMessage = ''; updateFulfillmentDraft('dispatch', { palletCode: item.palletNo, dispatchItemId: item.dispatchItemId, cartonCode: '', packages: Math.max(1, Math.min(item.scheduledPackages - item.pickedPackages, item.positions?.[0]?.availablePackages || 1)) }) },
 			async submitPick() {
 				if (!this.canPick) return
 				const pick = this.selectedReturnCarton ? { positionId: null, cartonMark: this.selectedReturnCarton.cartonMark, packages: 1, productQuantity: this.selectedReturnCarton.productQuantity } : { positionId: this.selectedPosition.id, packages: Number(this.packages), productQuantity: 0 }