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/scripts/__tests__/generate-tokens.test.ts

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+import { describe, it, expect } from 'vitest';
+import {
+  parseTokensFromScss,
+  parseScssVariables,
+  resolveTokenValues,
+} from '../generate-tokens';
+
+describe('parseScssVariables', () => {
+  it('extracts SCSS variable declarations', () => {
+    const scss = '$pri: #C4623A;\n$bg: #F5F0EB;';
+    const vars = parseScssVariables(scss);
+    expect(vars).toEqual({ pri: '#C4623A', bg: '#F5F0EB' });
+  });
+
+  it('ignores comments and non-variable lines', () => {
+    const scss = '// comment\n$pri: #C4623A;';
+    const vars = parseScssVariables(scss);
+    expect(vars).toEqual({ pri: '#C4623A' });
+  });
+
+  it('handles values with spaces and units', () => {
+    const scss = '$shadow-sm: 0 1px 4px rgba(45, 42, 38, 0.06);\n$r: 16px;';
+    const vars = parseScssVariables(scss);
+    expect(vars['shadow-sm']).toBe('0 1px 4px rgba(45, 42, 38, 0.06)');
+    expect(vars['r']).toBe('16px');
+  });
+});
+
+describe('parseTokensFromScss', () => {
+  it('extracts --tk-* CSS variables from page selector', () => {
+    const scss = `page {
+  --tk-font-h1: 28px;
+  --tk-font-body: 16px;
+}`;
+    const tokens = parseTokensFromScss(scss, 'page');
+    expect(tokens).toEqual({ 'font-h1': '28px', 'font-body': '16px' });
+  });
+
+  it('extracts from class selector', () => {
+    const scss = `.elder-mode {
+  --tk-font-h1: 32px;
+}`;
+    const tokens = parseTokensFromScss(scss, '.elder-mode');
+    expect(tokens).toEqual({ 'font-h1': '32px' });
+  });
+
+  it('captures SCSS variable references as-is for later resolution', () => {
+    const scss = `page {
+  --tk-pri: #{$pri};
+  --tk-font-body: 16px;
+}`;
+    const tokens = parseTokensFromScss(scss, 'page');
+    expect(tokens['pri']).toBe('#{$pri}');
+    expect(tokens['font-body']).toBe('16px');
+  });
+
+  it('returns empty object when selector not found', () => {
+    const scss = `page { --tk-font-h1: 28px; }`;
+    const tokens = parseTokensFromScss(scss, '.nonexistent');
+    expect(tokens).toEqual({});
+  });
+});
+
+describe('resolveTokenValues', () => {
+  it('replaces SCSS variable references with actual values', () => {
+    const tokensScss = `page {
+  --tk-pri: #{$pri};
+}`;
+    const varsScss = '$pri: #C4623A;';
+    const result = resolveTokenValues(tokensScss, varsScss, 'page');
+    expect(result).toEqual({ pri: '#C4623A' });
+  });
+
+  it('handles plain values without SCSS references', () => {
+    const tokensScss = `page {
+  --tk-card-radius: 16px;
+  --tk-font-body: 16px;
+}`;
+    const varsScss = '$r: 16px;';
+    const result = resolveTokenValues(tokensScss, varsScss, 'page');
+    expect(result['card-radius']).toBe('16px');
+    expect(result['font-body']).toBe('16px');
+  });
+
+  it('handles multiple variable references', () => {
+    const tokensScss = `page {
+  --tk-pri: #{$pri};
+  --tk-pri-l: #{$pri-l};
+  --tk-font-body: 16px;
+}`;
+    const varsScss = '$pri: #C4623A;\n$pri-l: #F0DDD4;';
+    const result = resolveTokenValues(tokensScss, varsScss, 'page');
+    expect(result['pri']).toBe('#C4623A');
+    expect(result['pri-l']).toBe('#F0DDD4');
+    expect(result['font-body']).toBe('16px');
+  });
+});

apps/miniprogram/scripts/generate-tokens.ts

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+// scripts/generate-tokens.ts
+// 从 src/styles/tokens.scss + variables.scss 解析 CSS 变量，
+// 输出 src/styles/token-values.ts 供 JS 运行时使用
+import { readFileSync, writeFileSync } from 'fs';
+import { resolve, dirname } from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+interface TokenMap {
+  [key: string]: string;
+}
+
+/** 解析 SCSS 文件中的 CSS 变量声明 */
+function parseTokensFromScss(
+  scssContent: string,
+  selector: string = 'page',
+): TokenMap {
+  const tokens: TokenMap = {};
+  const blockRegex = new RegExp(
+    `${selector.replace('.', '\\.')}\\s*\\{([\\s\\S]+?)\\n\\}`,
+  );
+  const blockMatch = scssContent.match(blockRegex);
+  if (!blockMatch) return tokens;
+
+  const varRegex = /--tk-([\w-]+)\s*:\s*([^;]+);/g;
+  let match: RegExpExecArray | null;
+  while ((match = varRegex.exec(blockMatch[1])) !== null) {
+    tokens[match[1]] = match[2].trim();
+  }
+  return tokens;
+}
+
+/** 解析 SCSS 变量（如 $pri: #C4623A）用于替换 #{...} 引用 */
+function parseScssVariables(scssContent: string): Record<string, string> {
+  const vars: Record<string, string> = {};
+  const regex = /\$([\w-]+)\s*:\s*([^;]+);/g;
+  let match: RegExpExecArray | null;
+  while ((match = regex.exec(scssContent)) !== null) {
+    vars[match[1]] = match[2].trim();
+  }
+  return vars;
+}
+
+/** 解析 tokens.scss，替换 SCSS 变量引用 */
+function resolveTokenValues(
+  tokensContent: string,
+  variablesContent: string,
+  selector: string,
+): TokenMap {
+  const scssVars = parseScssVariables(variablesContent);
+  const rawTokens = parseTokensFromScss(tokensContent, selector);
+  const resolved: TokenMap = {};
+  for (const [key, value] of Object.entries(rawTokens)) {
+    let resolvedValue = value;
+    resolvedValue = resolvedValue.replace(
+      /#\{\$([\w-]+)\}/g,
+      (_, varName) => scssVars[varName] || '',
+    );
+    resolved[key] = resolvedValue;
+  }
+  return resolved;
+}
+
+function generateTokenFile(
+  tokensPath: string,
+  variablesPath: string,
+  outputPath: string,
+): void {
+  const tokensContent = readFileSync(tokensPath, 'utf-8');
+  const variablesContent = readFileSync(variablesPath, 'utf-8');
+
+  const normalTokens = resolveTokenValues(
+    tokensContent,
+    variablesContent,
+    'page',
+  );
+  const elderTokens = resolveTokenValues(
+    tokensContent,
+    variablesContent,
+    '.elder-mode',
+  );
+  const doctorTokens = resolveTokenValues(
+    tokensContent,
+    variablesContent,
+    '.doctor-mode',
+  );
+
+  const output = `// Auto-generated by scripts/generate-tokens.ts — DO NOT EDIT
+// Generated at: ${new Date().toISOString()}
+
+export const TOKEN_VALUES = ${JSON.stringify(normalTokens, null, 2)} as const;
+
+export const ELDER_TOKEN_OVERRIDES = ${JSON.stringify(elderTokens, null, 2)} as const;
+
+export const DOCTOR_TOKEN_OVERRIDES = ${JSON.stringify(doctorTokens, null, 2)} as const;
+
+// Canvas 专用：字号（数字，单位 px）
+export const CANVAS_FONT_NORMAL = {
+  yLabel: 10,
+  xLabel: 10,
+  tooltip: 12,
+  pointNormal: 3,
+  pointAbnormal: 5,
+} as const;
+
+export const CANVAS_FONT_ELDER = {
+  yLabel: 14,
+  xLabel: 14,
+  tooltip: 16,
+  pointNormal: 5,
+  pointAbnormal: 8,
+} as const;
+`;
+
+  writeFileSync(outputPath, output, 'utf-8');
+  console.log(`[generate-tokens] Generated ${outputPath}`);
+  console.log(`  Normal: ${Object.keys(normalTokens).length} tokens`);
+  console.log(`  Elder: ${Object.keys(elderTokens).length} overrides`);
+  console.log(`  Doctor: ${Object.keys(doctorTokens).length} overrides`);
+}
+
+// CLI 入口
+if (process.argv[1]?.endsWith('generate-tokens.ts')) {
+  const root = resolve(__dirname, '..');
+  generateTokenFile(
+    resolve(root, 'src/styles/tokens.scss'),
+    resolve(root, 'src/styles/variables.scss'),
+    resolve(root, 'src/styles/token-values.ts'),
+  );
+}
+
+export { parseTokensFromScss, parseScssVariables, resolveTokenValues, generateTokenFile };