feat: refine UI behavior and enhance test compatibility

- Clear input value after confirming in the SaveConfigModal component
- Add a check for undefined grid source before removing series in chart actions

Signed-off-by: peterlu14 <peterlu810516@gmail.com>

src/components/task/content/configuration/SaveConfigModal.vue

@@ -36,6 +36,7 @@ export default {
   methods: {
     confirm: function () {
       this.$emit('confirm', [this.inputValue, this.lock])
+      this.inputValue = ''
     },
     undo: function () {
       this.inputValue = ''

src/store/modules/task/content/actions/chartAct.js

@@ -862,6 +862,7 @@ const chartActs = {
     const { chartID, gridIndex, gridSourceIndex } = payload
 
     const gridSource = state.chartData[chartID].gridSource[gridIndex][gridSourceIndex]
+    if (gridSource === undefined) return
     // remove series
     const seriesIndex = state.chartData[chartID].series.findIndex((val) => {
       return val.name === gridSource.name