refactor(waveform): 优化波形趋势图表交互功能

- 添加了 canResetTrendChart 计算属性用于判断是否可以重置图表
- 更新了工具栏状态控制逻辑，禁用状态下禁止重置操作
- 调整了图表边距配置，右侧留白从 18px 增加到 36px
- 时间轴底部留白从 30px 调整为 34px
- 时间轴标签间距从 6 调整为 8
- 集成了 ECharts 工具箱的数据缩放功能
- 替换了图标组件，使用箭头图标替代缩放图标
- 调整了工具栏项目顺序，将平移工具移到最后

frontend/src/views/tools/waveform/index.vue

@@ -351,13 +351,23 @@ const canPanTrendChart = computed(() => {
     return hasWaveformData.value && (start > 0 || end < 100)
 })
 
+const canResetTrendChart = computed(() => {
+    const { start, end } = trendXZoomRange.value
+
+    return (
+        hasWaveformData.value &&
+        (start > 0 || end < 100 || trendYZoomScale.value !== 1 || activeTrendInteractionMode.value !== 'none')
+    )
+})
+
 const activeTrendToolStates = computed<Partial<Record<TrendToolAction, boolean>>>(() => ({
     'box-zoom': activeTrendInteractionMode.value === 'box-zoom',
     pan: activeTrendInteractionMode.value === 'pan'
 }))
 
 const disabledTrendToolStates = computed<Partial<Record<TrendToolAction, boolean>>>(() => ({
-    pan: !canPanTrendChart.value
+    pan: !canPanTrendChart.value,
+    reset: !canResetTrendChart.value
 }))
 
 const TREND_AXIS_EXPAND_RATIO = 1.2
@@ -370,9 +380,9 @@ const TREND_AXIS_EXTRA_SPLIT_SCORE = 0.25
 const TREND_AXIS_READABLE_INTERVAL_STEPS = [1, 2, 2.5, 5, 10]
 const TREND_GRID_TOP = '6px'
 const TREND_GRID_LEFT = '52px'
-const TREND_GRID_RIGHT = '18px'
+const TREND_GRID_RIGHT = '36px'
 const TREND_GRID_BOTTOM = {
-    withTimeAxis: '30px',
+    withTimeAxis: '34px',
     withoutTimeAxis: '6px'
 }
 const TREND_LINE_MAX_WIDTH = 1.6
@@ -764,7 +774,7 @@ const buildTrendChartOptions = (
             // 仅最后一张图显示时间轴，前两张图不再额外预留占位，尽量放大趋势内容区。
             name: showTimeAxis ? 'ms' : '',
             nameLocation: 'end',
-            nameGap: showTimeAxis ? 6 : 0,
+            nameGap: showTimeAxis ? 8 : 0,
             nameTextStyle: {
                 color: axisTextColor
             },
@@ -802,6 +812,25 @@ const buildTrendChartOptions = (
                 moveOnMouseWheel: activeTrendInteractionMode.value === 'pan'
             }
         ],
+        toolbox: {
+            // 外部工具栏通过 takeGlobalCursor 激活框选放大，ECharts 仍需要注册 toolbox.dataZoom 才会创建框选控制器。
+            show: true,
+            showTitle: false,
+            itemSize: 0,
+            itemGap: 0,
+            left: -100,
+            top: -100,
+            feature: {
+                dataZoom: {
+                    yAxisIndex: 'none',
+                    brushStyle: {
+                        color: 'rgba(64, 158, 255, 0.18)',
+                        borderColor: 'rgba(64, 158, 255, 0.65)',
+                        borderWidth: 1
+                    }
+                }
+            }
+        },
         color: chartColors,
         series: buildTrendSeries(seriesList)
     }