feat(settings,questions,school,textbooks): add brand config, question components, school dialogs, textbooks hooks

settings:

- Add actions-brand, brand-config, data-access-brand for brand management

- Add admin-file-upload-card, admin-notification-config-card, admin-school-info-card, admin-security-policy-card

- Add ai-provider-delete-dialog, ai-provider-selector, brand-config-card

- Add security-recent-logins-section, security-two-factor-section

- Add config/profile-overview-config, data-access-profile-overview, lib/system-settings-utils

questions:

- Add batch-operations, import-export-buttons, knowledge-point-selector, options-editor

- Add question-bank-results-client, question-cascade-filter, question-content-renderer, utils

school:

- Add grade-delete-dialog, grade-form-dialog, grade-list-toolbar, grade-overview-cards

- Add use-grade-data hook

textbooks:

- Add textbook-form-fields component

- Add use-kp-create, use-kp-delete, use-kp-update hooks

src/modules/textbooks/components/graph-kp-node.tsx

@@ -4,8 +4,7 @@ import { memo } from "react"
 import { Handle, Position, type NodeProps } from "@xyflow/react"
 import { useTranslations } from "next-intl"
 import { cn } from "@/shared/lib/utils"
-import type { GraphNodeData, MasteryLevel } from "../types"
-import type { GraphLayoutNodeData } from "../graph-layout"
+import type { GraphNodeData, MasteryLevel, KpWithRelations } from "../types"
 import { NODE_WIDTH } from "../graph-layout"
 
 /** 根据掌握度计算色彩等级 */
@@ -30,11 +29,23 @@ const MASTERY_BAR_COLORS: Record<MasteryLevel, string> = {
   unassessed: "bg-muted",
 }
 
-function GraphKpNodeComponent({ data, selected }: NodeProps) {
+/**
+ * 类型守卫：从 React Flow node.data（Record<string, unknown>）安全提取图谱节点数据。
+ * 替代 as unknown as 双重断言，提供运行时安全。
+ */
+function extractNodeData(data: Record<string, unknown>): {
+  kp: KpWithRelations
+  graphData?: GraphNodeData
+} {
+  const kp = data.kp as KpWithRelations
+  const graphData = data.graphData as GraphNodeData | undefined
+  return { kp, graphData }
+}
+
+function GraphKpNodeComponent(props: NodeProps) {
   const t = useTranslations("textbooks")
-  const nodeData = data as unknown as GraphLayoutNodeData
-  const { kp } = nodeData
-  const graphData = (data as unknown as { graphData?: GraphNodeData }).graphData
+  const { data, selected } = props
+  const { kp, graphData } = extractNodeData(data)
   const mastery = graphData?.mastery ?? null
   const masteryLevel = getMasteryLevel(mastery?.masteryLevel ?? null)
   const showMastery = graphData?.viewMode === "student-mastery" || graphData?.viewMode === "class-mastery"