fix(mes/roll/grind): 修复当前辊径显示和取值逻辑

将当前辊径取值改为优先使用有效当前辊径计算逻辑，统一磨削前辊径取值

klp-ui/src/views/mes/roll/grind/index.vue

@@ -68,7 +68,7 @@
               <div class="rh-item"><span class="rh-k">辊型</span><span class="rh-v">{{ selectedRoll.rollType === 'WR' ? '工作辊' : '支撑辊' }}</span></div>
               <div class="rh-item"><span class="rh-k">材质</span><span class="rh-v">{{ selectedRoll.material || '—' }}</span></div>
               <div class="rh-item"><span class="rh-k">初始辊径</span><span class="rh-v">{{ selectedRoll.initialDia != null ? selectedRoll.initialDia + ' mm' : '—' }}</span></div>
-              <div class="rh-item"><span class="rh-k">当前辊径</span><span class="rh-v bold accent">{{ selectedRoll.currentDia != null ? selectedRoll.currentDia + ' mm' : '—' }}</span></div>
+              <div class="rh-item"><span class="rh-k">当前辊径</span><span class="rh-v bold accent">{{ effectiveCurrentDia != null ? effectiveCurrentDia + ' mm' : '—' }}</span></div>
               <div class="rh-item"><span class="rh-k">最小辊径</span><span class="rh-v">{{ selectedRoll.minDia != null ? selectedRoll.minDia + ' mm' : '—' }}</span></div>
               <div class="rh-item"><span class="rh-k">磨削次数</span><span class="rh-v">{{ tableData.length ? tableData.length + ' 次' : '0 次' }}</span></div>
               <div class="rh-item"><span class="rh-k">粗糙度</span><span class="rh-v">{{ selectedRoll.roughness != null ? selectedRoll.roughness + ' μm' : '—' }}</span></div>
@@ -296,6 +296,22 @@ export default {
       })
     },
 
+    // 有效当前辊径：优先取 currentDia，无则取最新磨削记录的磨后径
+    effectiveCurrentDia() {
+      if (this.selectedRoll && this.selectedRoll.currentDia != null) {
+        return parseFloat(this.selectedRoll.currentDia)
+      }
+      if (this.grindList.length > 0) {
+        const latest = [...this.grindList].sort((a, b) => {
+          const ta = a.grindTime ? new Date(a.grindTime).getTime() : 0
+          const tb = b.grindTime ? new Date(b.grindTime).getTime() : 0
+          return tb - ta
+        })[0]
+        if (latest && latest.diaAfter != null) return parseFloat(latest.diaAfter)
+      }
+      return null
+    },
+
     // 表格数据：新增时在顶部插入一个编辑行占位
     tableData() {
       if (this.editRow && this.editRow.__isNew) {
@@ -401,8 +417,7 @@ export default {
         rollId:     this.selectedRollId,
         grindTime,
         team:       undefined,
-        diaBefore:  this.selectedRoll && this.selectedRoll.currentDia != null
+        diaBefore:  this.effectiveCurrentDia != null ? this.effectiveCurrentDia : undefined,
-                      ? parseFloat(this.selectedRoll.currentDia) : undefined,
         diaAfter:   undefined,
         rollShape:  '平',
         flawResult: '合格',