feat(miniprogram): Token 常量生成脚本 + useCanvasTokens hook (E2-1 Phase 2)

- 新增 scripts/generate-tokens.ts 从 SCSS 解析 CSS 变量生成 token-values.ts
- 新增 useCanvasTokens hook 供 Canvas 组件适老化/医生端切换
- vitest include 扩展覆盖 scripts/__tests__/
- 10 单元测试覆盖 SCSS 解析和变量替换

apps/miniprogram/src/hooks/useCanvasTokens.ts

@@ -0,0 +1,89 @@
+import { useMemo } from 'react';
+import {
+  TOKEN_VALUES,
+  ELDER_TOKEN_OVERRIDES,
+  DOCTOR_TOKEN_OVERRIDES,
+  CANVAS_FONT_NORMAL,
+  CANVAS_FONT_ELDER,
+} from '@/styles/token-values';
+import { useUIStore } from '@/stores/ui';
+import { useAuthStore } from '@/stores/auth';
+
+/** Canvas 绘制用的合并 Token */
+export interface CanvasTokens {
+  pri: string;
+  tx: string;
+  tx2: string;
+  gridColor: string;
+  fontH1: number;
+  fontBody: number;
+  fontBodySm: number;
+  fontCap: number;
+  yLabelFontSize: number;
+  xLabelFontSize: number;
+  tooltipFontSize: number;
+  pointNormalRadius: number;
+  pointAbnormalRadius: number;
+  referenceBandColor: string;
+  areaGradientStart: string;
+  areaGradientEnd: string;
+  lineColor: string;
+  abnormalColor: string;
+}
+
+function pxToInt(val: string | undefined, fallback: number): number {
+  if (!val) return fallback;
+  return parseInt(val, 10) || fallback;
+}
+
+/** 为 Canvas 组件提供适老化/医生端的 Token 值 */
+export function useCanvasTokens(): CanvasTokens {
+  const mode = useUIStore((s) => s.mode);
+  const isDoctor = useAuthStore((s) => s.isDoctor());
+
+  return useMemo(() => {
+    const tokens = TOKEN_VALUES as Record<string, string>;
+    const docTokens = DOCTOR_TOKEN_OVERRIDES as Record<string, string>;
+    const elderTokens = ELDER_TOKEN_OVERRIDES as Record<string, string>;
+
+    let pri = tokens['pri'] || '#C4623A';
+    const tx = '#2D2A26';
+
+    if (isDoctor) {
+      pri = docTokens['pri'] || pri;
+    }
+
+    const isElder = mode === 'elder';
+    const fontSet = isElder ? CANVAS_FONT_ELDER : CANVAS_FONT_NORMAL;
+
+    return {
+      pri,
+      tx,
+      tx2: isElder ? '#5A554F' : (tokens['text-secondary'] || '#78716C'),
+      gridColor: isElder ? '#E0DBD5' : '#F3F4F6',
+      fontH1: pxToInt(tokens['font-h1'], 28),
+      fontBody: pxToInt(
+        isElder ? elderTokens['font-body'] : tokens['font-body'],
+        isElder ? 22 : 16,
+      ),
+      fontBodySm: pxToInt(
+        isElder ? elderTokens['font-body-sm'] : tokens['font-body-sm'],
+        isElder ? 19 : 14,
+      ),
+      fontCap: pxToInt(
+        isElder ? elderTokens['font-cap'] : tokens['font-cap'],
+        isElder ? 18 : 13,
+      ),
+      yLabelFontSize: fontSet.yLabel,
+      xLabelFontSize: fontSet.xLabel,
+      tooltipFontSize: fontSet.tooltip,
+      pointNormalRadius: fontSet.pointNormal,
+      pointAbnormalRadius: fontSet.pointAbnormal,
+      referenceBandColor: isElder ? 'rgba(5,150,105,0.15)' : 'rgba(5,150,105,0.08)',
+      areaGradientStart: isElder ? 'rgba(8,145,178,0.20)' : 'rgba(8,145,178,0.15)',
+      areaGradientEnd: 'rgba(8,145,178,0.01)',
+      lineColor: '#0891B2',
+      abnormalColor: '#DC2626',
+    };
+  }, [mode, isDoctor]);
+}