Task 15: product detail anchor tabs + per-product custom sections

User report: product detail page was wrong — section titles are
per-product custom data (CMS wppop_sections migration: Packing &
Delivery / Our Exhibition / Our Certifications / Our Company / FAQ),
not fixed headings; they must drive an anchor tab system like the
CMS [locale]/products/[slug].astro detailTabs.

Data side (both layers, task option 1 + 2):

- theme_pro.product_detail_sections: fields.sections
  [{title, content}] JSON is the structured source; legacy sync
  output that appended sections as trailing body H2 blocks is
  recognized by known/data titles and split out (overview keeps the
  rest; same-title blocks dedupe to the structured version; Features
  body block drops when fields.features renders it)
- sync_cms_data.build_product: store sections/features as structured
  fields JSON, stop appending H2 blocks to the body; stats now count
  entries with a sections field
- Specifications table no longer leaks structural JSON field keys
  (sections/features/specs/gallery/categories) — scalar spec keys
  only

Template side (trade-pro product.html, replaces 12a panel
switching):

- tab sequence is fully data-driven and matches the CMS: Product
  Details (always) -> custom sections (data titles) ->
  Specifications / Features (shown only when data exists)
- tabs are #anchor links, not panel toggles: all sections render
  flat with visible titles (readable and crawlable without JS; native
  anchor jump), JS adds smooth scrolling + scrollspy highlight +
  tab centering in the horizontal scroll row
- section ids are slug-derived (sec-packing-delivery), duplicate
  titles get an index suffix; features grid ports the CMS
  detail-feature-row

Tests: test_trade_pro_product_layout_structure rewritten for the
anchor-tab contract — sections via fields, legacy body-H2 fallback,
spec/features conditional tabs, no-sections product showing only
Product Details + Specifications, spec table free of JSON key leaks,
updated pro.css needles. 30 passed; the 1 failure
(test_trade_pro_blocks_visual_bridge) fails identically on the
previous commit (pre-existing, unrelated).

Co-Authored-By: Claude Code <noreply@example.com>

themes/trade-pro/pages/product.html

@@ -1,19 +1,22 @@
-{# trade-pro product detail — cms 产品详情精确对齐重做（Task 12a，重做 10b）。
+{# trade-pro product detail — cms 产品详情精确对齐重做（Task 12a，重做 10b）；
+Task 15 选项卡改锚点 Tab + 每产品自定义区块。
 设计源（唯一权威依据）D:/project/cms/runtimes/astro-site-runtime/src/pages/
 [locale]/products/[slug].astro，区块序列逐块对照：
 detail-hero（面包屑 + 1.08/0.92 双栏：画廊/标题区，cms 产品名 h2 全页无 h1）
-→ product-tabbed（sticky 选项卡：Product Details 正文恒有 + Specifications
-参数表有数据才显）→ related-detail（sf-tp-card 卡片网格）→ quote-section
+→ product-tabbed（sticky 锚点选项卡：Product Details 正文恒有 → 每产品自定义
+区块 detail_sections（wppop_sections 迁移，标题来自数据）→ Specifications /
+Features 按数据显隐）→ related-detail（sf-tp-card 卡片网格）→ quote-section
 （左联系信息 + 右 CTA/外部表单）。
 与 cms 的三处结构决策：
-1. 选项卡系统照搬 cms：容器 data-sf-tp-tabbed + .sf-tp-panel/.active 面板 +
-尾部内联 <script> 切换（运行时给容器加 sf-tp-tabs-enabled，CSS 只显示
-active 面板并隐藏 panel-title）——无 JS 时默认形态即 cms 回退形态：面板
-全部平铺可读、panel-title 可见，静态可抓取。
+1. 选项卡为锚点跳转非面板切换（用户要求，Task 15）：Tab 是 #anchor 链接，
+区块全部平铺渲染 + panel-title 常显——无 JS 时原生锚点跳转、全部区块可读，
+静态可抓取；JS 渐进增强平滑滚动 + scrollspy 高亮当前 Tab 并在横滚行内居中。
 2. 正文不拆表：WordPress 规格表 <table> 直接在 body HTML 里，正文整体作为
-Product Details 面板渲染（.sf-tp-product-body rich-body 表格样式：全宽/
+Product Details 区块渲染（.sf-tp-product-body rich-body 表格样式：全宽/
 发丝框/斑马纹/覆盖内联宽高/单元格 div 净空）；specs 变量有数据时另设
-Specifications 面板（干净 spec-table，每行两对键值，从 fields 读）。
+Specifications 区块（干净 spec-table，每行两对键值，从 fields 读）。
+自定义区块数据由 theme_pro.product_detail_sections 供给：fields.sections
+结构化优先，旧同步产物的 body H2 段识别拆出（正文 overview 不重复渲染）。
 3. 画廊交互复用平台 pro.js 既有钩子（.pro-product-media /
 .pro-gallery-thumbs / [data-gallery-image]）：缩略图点击换主图 + 主图灯箱，
 零新增 JS；无 JS 时全部图片仍平铺可读。无图回退封面，再无则占位渐变
@@ -61,27 +64,47 @@ Specifications 面板（干净 spec-table，每行两对键值，从 fields 读
 </div>
 </div>
 </section>
-{# 选项卡详情（cms .product-tabbed）：Tab 列表按数据动态生成——
-Product Details（正文）恒有；Specifications 仅 specs 有数据才显示。
-cms 的每产品自定义区块/Features 无平台数据源，不进 Tab。 #}
+{# 选项卡详情（cms .product-tabbed，Task 15 改锚点 Tab）：Tab 序列完全数据
+驱动，对齐 cms detailTabs——Product Details（正文）恒有 → 每产品自定义区块
+detail_sections（CMS wppop_sections 迁移：Packing & Delivery / Our Exhibition /
+Our Certifications / Our Company / FAQ，标题来自数据不固定；theme_pro 从
+fields.sections 读、旧同步产物从 body H2 段识别拆出）→ Specifications（specs
+有数据才显）→ Features（fields.features 有数据才显）。
+Tab 是锚点跳转非面板切换（用户要求 + 区块全部平铺渲染）：无 JS 时原生锚点
+跳转 + 全部区块可读、标题可见，静态可抓取；JS 平滑滚动 + scrollspy 高亮。 #}
 {% set tp_spec_rows = specs | rejectattr('label', 'equalto', 'gallery') | list %}
 <div class="sf-tp-product-tabbed" data-sf-tp-tabbed>
 <nav class="sf-tp-product-tabs" aria-label="Product details">
 <div class="wrap sf-tp-tabs-row">
-<button class="sf-tp-tab active" data-panel="overview" role="tab" aria-selected="true" type="button">Product Details</button>
+<a class="sf-tp-tab active" href="#overview" role="tab" aria-selected="true">Product Details</a>
+{% for s in detail_sections %}
+<a class="sf-tp-tab" href="#{{ s.id }}" role="tab" aria-selected="false">{{ s.title }}</a>
+{% endfor %}
 {% if tp_spec_rows %}
-<button class="sf-tp-tab" data-panel="specifications" role="tab" aria-selected="false" type="button">Specifications</button>
+<a class="sf-tp-tab" href="#specifications" role="tab" aria-selected="false">Specifications</a>
+{% endif %}
+{% if detail_features %}
+<a class="sf-tp-tab" href="#features" role="tab" aria-selected="false">Features</a>
 {% endif %}
 </div>
 </nav>
-<section id="overview" class="sf-tp-detail-section sf-tp-panel active">
+
+<section id="overview" class="sf-tp-detail-section">
 <div class="wrap">
 <h2 class="sf-tp-panel-title">Product details</h2>
-<div class="sf-tp-product-body">{{ body_copy(content, page) }}</div>
+<div class="sf-tp-product-body">{{ body_copy(detail_overview, page) }}</div>
 </div>
 </section>
+{% for s in detail_sections %}
+<section id="{{ s.id }}" class="sf-tp-detail-section">
+<div class="wrap">
+<h2 class="sf-tp-panel-title">{{ s.title }}</h2>
+<div class="rich-body sf-tp-product-body">{{ s.content }}</div>
+</div>
+</section>
+{% endfor %}
 {% if tp_spec_rows %}
-<section id="specifications" class="sf-tp-detail-section sf-tp-detail-section--compact sf-tp-panel">
+<section id="specifications" class="sf-tp-detail-section sf-tp-detail-section--compact">
 <div class="wrap">
 <h2 class="sf-tp-panel-title">Specifications</h2>
 <div class="sf-tp-table-scroll">
@@ -97,29 +120,64 @@ cms 的每产品自定义区块/Features 无平台数据源，不进 Tab。 #}
 </div>
 </section>
 {% endif %}
+{% if detail_features %}
+<section id="features" class="sf-tp-detail-section sf-tp-detail-section--compact">
+<div class="wrap">
+<h2 class="sf-tp-panel-title">Features</h2>
+<div class="sf-tp-detail-features">
+{% for f in detail_features %}
+<div class="sf-tp-detail-feature">
+<span aria-hidden="true">✦</span>
+<div><h3>{{ f.title }}</h3><p>{{ f.desc }}</p></div>
+</div>
+{% endfor %}
+</div>
+</div>
+</section>
+{% endif %}
 </div>
 <script>
-/* 详情选项卡（cms [slug].astro 尾部脚本移植）：渐进增强——运行时给容器加
-sf-tp-tabs-enabled（CSS 只显示 active 面板并隐藏 panel-title）；无 JS 时
-面板全部平铺可读。 */
+/* 锚点选项卡（Task 15，cms [slug].astro 尾部脚本重做）：点击平滑滚动到区块
+并在横滚行内居中；scrollspy 滚动高亮当前 Tab。无 JS 时为原生锚点跳转，
+区块全部平铺可读。 */
 (function () {
 var tabbed = document.querySelector('[data-sf-tp-tabbed]');
 if (!tabbed) return;
-tabbed.classList.add('sf-tp-tabs-enabled');
+var nav = tabbed.querySelector('.sf-tp-product-tabs');
 var tabs = Array.prototype.slice.call(tabbed.querySelectorAll('.sf-tp-tab'));
-tabs.forEach(function (tab) {
-tab.addEventListener('click', function () {
-tabs.forEach(function (t) {
-var on = t === tab;
+var targets = tabs.map(function (t) {
+return document.getElementById((t.getAttribute('href') || '').slice(1));
+});
+function activate(i, center) {
+tabs.forEach(function (t, j) {
+var on = i === j;
 t.classList.toggle('active', on);
 t.setAttribute('aria-selected', on ? 'true' : 'false');
 });
-Array.prototype.slice.call(tabbed.querySelectorAll('.sf-tp-panel')).forEach(function (p) {
-p.classList.toggle('active', p.id === tab.getAttribute('data-panel'));
-});
-tab.scrollIntoView({ inline: 'center', block: 'nearest', behavior: 'smooth' });
+if (center && tabs[i] && tabs[i].scrollIntoView) {
+tabs[i].scrollIntoView({ inline: 'center', block: 'nearest', behavior: 'smooth' });
+}
+}
+tabs.forEach(function (tab, i) {
+tab.addEventListener('click', function (e) {
+var target = targets[i];
+if (!target) return;
+e.preventDefault();
+target.scrollIntoView({ behavior: 'smooth', block: 'start' });
+activate(i, true);
 });
 });
+var current = -1;
+function spy() {
+var mark = (nav ? nav.getBoundingClientRect().bottom : 0) + 32;
+var idx = 0;
+targets.forEach(function (el, i) {
+if (el && el.getBoundingClientRect().top <= mark) idx = i;
+});
+if (idx !== current) { current = idx; activate(idx, true); }
+}
+window.addEventListener('scroll', spy, { passive: true });
+spy();
 })();
 </script>
 {% set tp_related = (groups['product'] + groups['vehicle']) | rejectattr('route', 'equalto', page.route) | list %}