fix(web): 修复 TypeScript 编译错误 — 10 处类型/未使用变量问题

- EntitySelect: 未使用的 searchFields 改为 _searchFields
- PluginKanbanPage: DragEndEvent/DragStartEvent 改为 type import, lane_order 改为 optional
- PluginDashboardPage: 添加 PluginPageSchema import, 移除未使用的 CHART_COLORS/palette/totalCount
- PluginGraphPage: 移除未使用的 Title/textColor, 修复 hovered → hoverState

apps/web/src/pages/PluginGraphPage.tsx

@@ -33,7 +33,7 @@ import {
   type PluginSchemaResponse,
 } from '../api/plugins';
 
-const { Text, Title } = Typography;
+const { Text } = Typography;
 
 // ── Types ──
 
@@ -300,7 +300,6 @@ function drawEdgeLabel(
   y: number,
   label: string,
   color: string,
-  textColor: string,
   alpha: number,
 ) {
   ctx.save();
@@ -617,7 +616,7 @@ export function PluginGraphPage() {
       // Edge label
       if (edge.label && labelPos) {
         const labelAlpha = hoverState.nodeId ? (isHighlighted ? 1 : 0.1) : 0.9;
-        drawEdgeLabel(ctx, labelPos.labelX, labelPos.labelY - 10, edge.label, colors.base, textColor, labelAlpha);
+        drawEdgeLabel(ctx, labelPos.labelX, labelPos.labelY - 10, edge.label, colors.base, labelAlpha);
       }
     }
 
@@ -672,7 +671,7 @@ export function PluginGraphPage() {
     if (hoverState.nodeId) {
       const hoveredNode = nodes.find((n) => n.id === hoverState.nodeId);
       if (hoveredNode) {
-        const degree = degreeMap.get(hovered.nodeId) || 0;
+        const degree = degreeMap.get(hoverState.nodeId) || 0;
         const tooltipText = `${hoveredNode.label} (${degree} 条关系)`;
         ctx.save();
         ctx.font = '12px -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif';