v1.3.2: 契约第三批 43 份（全量 79/79）+ 令牌导出三格式

契约全量闭环
- 补齐剩余 43 份契约，components/ 现为 79 份契约 JSON（此前 36）
- 批次 A(19)：tag/tabs/steps/breadcrumb/dropdown/popconfirm/buttongroup/
  expandabletable/mergedcelltable/summaryrowtable/fixedcolumntable/
  enhancedtabnav/sidemenu/topmenu/mixednavigation/quicknav/anchornav/
  backtotop/pagetransition
- 批次 B(24)：bankcardinput/idcardinput/plateinput/listpicker/
  rangequickpicker/dragupload/signaturepad/messagepro/notificationpro/
  progressvariants/skeletonpro/emptypro/loadingoverlay/resultvariants/
  exceptionvariants/confirmmodal/alertmodal/formmodal/fullscreenmodal/
  themeswitcher/layoutswitcher/densityswitcher/shortcutpanel/bottomsheet
- 内容逐字来自规格原文（组件1/2/5/6/7.txt）；不发明，规格未明示进
  unknowns、明确排除进 doNotInvent。校验确认 79/79 字段完整、slug 一致
- 此前 43 个扩展组件的 API 靠 extractComponentAPI() 正则启发式，现有契约
  为准、源码扫描兜底

令牌导出（文档清单 C4 项）
- build-site.ps1 构建期产出三种标准格式，与站点展示的令牌同源：
  site/tokens/tokens.css   CSS 自定义属性
  site/tokens/dtcg.json    W3C DTCG（$value/$type/$description，按
                           color/typography/spacing/radius/shadow/motion/size 分组）
  site/tokens/figma.json   Figma Tokens（Tokens Studio 可直接导入）
- 设计规范页新增「令牌导出」区，三个文件可下载（HTTP 200 已验）

规格与实现对齐
- 规格色彩系统同步到 v1.3.1 的 AA 达标值（15 处），原值处标注变更原因
  与对比度实测
- 修正一处既有漂移：Rate 选中星色规格 #FAAD14 白底仅 1.90:1，不满足
  WCAG 1.4.11 的 3:1；实现取 #2F54EB，规格已对齐并注明

修复
- build-site.ps1 令牌导出段两处 PowerShell 问题：$themes/$schema 被当变量
  展开导致 Null 键；Write-Output 字符串里的 {} 被当格式占位符

验证
- 站点版本 1.3.2、契约化 79/79、令牌导出 3 文件、静态薄壳 79
- 回归保持 100%：961 断言 / 0 失败 / 36 N/A / 79 页全通过（无回退）

build-site.ps1

@@ -242,6 +242,79 @@ $utf8NoBom = New-Object System.Text.UTF8Encoding($false)
 [System.IO.File]::WriteAllText((Join-Path (Get-Location) "site/data.js"), $js, $utf8NoBom)
 [System.IO.File]::WriteAllText((Join-Path (Get-Location) "site/data.json"), $json, $utf8NoBom)
 
+# ---------------- design token export (W3C DTCG + Figma Tokens) ----------------
+# Two standard interchange formats so the tokens can be consumed outside this repo
+# without hand-copying values. Both are generated here, never edited by hand.
+function Get-TokenGroup([string]$name) {
+  if ($name -match 'color|brand|text|bg|border|success|warning|error|info|mask') { return 'color' }
+  if ($name -match 'font|type') { return 'typography' }
+  if ($name -match 'radius') { return 'radius' }
+  if ($name -match 'space|gap|padding') { return 'spacing' }
+  if ($name -match 'shadow|elevation') { return 'shadow' }
+  if ($name -match 'duration|ease|motion') { return 'motion' }
+  if ($name -match 'size|height|width|icon') { return 'size' }
+  return 'misc'
+}
+
+# W3C Design Tokens Community Group format: nested groups, $value / $type.
+$dtcg = [ordered]@{}
+foreach ($t in $tokens) {
+  $g = Get-TokenGroup $t.name
+  if (-not $dtcg.Contains($g)) { $dtcg[$g] = [ordered]@{} }
+  $type = switch ($g) {
+    'color'      { 'color' }
+    'radius'     { 'dimension' }
+    'spacing'    { 'dimension' }
+    'size'       { 'dimension' }
+    'shadow'     { 'shadow' }
+    'typography' { 'fontFamily' }
+    default      { 'other' }
+  }
+  $node = [ordered]@{ '$value' = $t.value; '$type' = $type }
+  if ($t.comment) { $node['$description'] = $t.comment }
+  $dtcg[$g][$t.name] = $node
+}
+$dtcgDoc = [ordered]@{
+  '$schema'   = 'https://schemas.design-tokens.org/draft/dtcg.json'
+  '$metadata' = [ordered]@{ name = 'Aurora Admin'; version = $siteVersion; brand = '#2F54EB'; generated = (Get-Date -Format 'yyyy-MM-dd HH:mm') }
+  'tokens'    = $dtcg
+}
+New-Item -ItemType Directory -Force -Path "site/tokens" | Out-Null
+[System.IO.File]::WriteAllText((Join-Path (Get-Location) "site/tokens/dtcg.json"), (Json-Value $dtcgDoc), $utf8NoBom)
+
+# Figma Tokens (Tokens Studio) format: flat "global" set, value + type + description.
+$figmaGlobal = [ordered]@{}
+foreach ($t in $tokens) {
+  $g = Get-TokenGroup $t.name
+  $ft = switch ($g) {
+    'color'   { 'color' }
+    'size'    { 'sizing' }
+    'spacing' { 'spacing' }
+    'radius'  { 'borderRadius' }
+    'shadow'  { 'boxShadow' }
+    default   { 'other' }
+  }
+  $figmaGlobal[$t.name] = [ordered]@{ value = $t.value; type = $ft; description = $t.comment }
+}
+$figmaDoc = [ordered]@{
+  global          = $figmaGlobal
+  '$themes'       = @()
+  '$metadata'     = [ordered]@{ tokenSetOrder = @('global') }
+}
+[System.IO.File]::WriteAllText((Join-Path (Get-Location) "site/tokens/figma.json"), (Json-Value $figmaDoc), $utf8NoBom)
+
+# Plain CSS custom properties — drop-in for any project that just wants the variables.
+$cssLines = New-Object System.Text.StringBuilder
+[void]$cssLines.AppendLine('/* Aurora Admin design tokens - generated by build-site.ps1 */')
+[void]$cssLines.AppendLine(':root {')
+foreach ($t in $tokens) {
+  $note = if ($t.comment) { ' /* ' + $t.comment + ' */' } else { '' }
+  [void]$cssLines.AppendLine(('  --{0}: {1};{2}' -f $t.name, $t.value, $note))
+}
+[void]$cssLines.AppendLine('}')
+[System.IO.File]::WriteAllText((Join-Path (Get-Location) "site/tokens/tokens.css"), $cssLines.ToString(), $utf8NoBom)
+Write-Output ("token export: site/tokens/ (dtcg.json + figma.json + tokens.css), {0} tokens" -f $tokens.Count)
+
 # ---------------- static thin shells + sitemap (SEO / crawler entry points) ----------------
 # UPDATE $SiteUrlBase after repository deployment (GitHub Pages URL), then rebuild once.
 $SiteUrlBase = "https://YOUR-ACCOUNT.github.io/aurora-admin/"