fix(site-import): extract 清洗未闭合块/style 守卫/logo 日期钉位

评审收口三项：clean_html 配对块清理后兜底删 EOF 未闭合块（>500KB
截断防 script/style 泄漏误判 is_thin，顺序钉死配对先行）；style 属性
正则补 \s 守卫（data-style 不参与配色计数）；FIXTURE_WP 旧日期 logo
前置使日期优先真被甄别（首现即胜的伪绿不再成立）。

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

tests/test_site_import_extract.py

@@ -29,6 +29,7 @@ FIXTURE_WP = """<!DOCTYPE html>
   times on every order of building products.</p>
   <div class="hero" style="background:#ffffff">
     <img src="https://ex.com/wp-content/uploads/2026/01/hero-banner.jpg" alt="hero">
+    <img src="https://ex.com/wp-content/uploads/2020/02/logo-old.png" alt="old logo">
     <a href="/"><img src="https://ex.com/wp-content/uploads/2026/03/logo-new.png" alt="logo"></a>
   </div>
   <section style="background-color:#ffffff">
@@ -41,7 +42,6 @@ FIXTURE_WP = """<!DOCTYPE html>
     <a href="https://wa.me/8618603858592">WhatsApp us</a> |
     <a href="mailto:sales@hesuu.com">Email sales</a> |
     <a href="https://blog.other.com/building-tips">External blog</a>
-    <img src="https://ex.com/wp-content/uploads/2020/02/logo-old.png" alt="old logo">
   </section>
   <section class="cards" style="background:#ffffff">
     <div class="card" style="background:#ffffff;border-top:4px solid #FCCA03">
@@ -96,6 +96,9 @@ FIXTURE_CROSS = """<html><body>
 <a href="javascript:void(0)">JS</a>
 </body></html>"""
 
+# >500KB 抓取截断可能切在 script 中间——EOF 未闭合块不得泄漏进清洗文本
+FIXTURE_UNCLOSED = '<html><body><p>keep this text</p><script>var j = "JAVAJUNK";'
+
 
 class TestCleanHtml:
     def test_去script_style_nav_footer_header_comment(self):
@@ -108,6 +111,11 @@ class TestCleanHtml:
         t = clean_html(FIXTURE_9K)
         assert len(t) <= 8192
 
+    def test_EOF未闭合script不泄漏(self):
+        t = clean_html(FIXTURE_UNCLOSED)
+        assert "JAVAJUNK" not in t
+        assert "keep this text" in t
+
 
 class TestExtractColor:
     def test_排除白黑灰取最高频(self):
@@ -125,6 +133,11 @@ class TestExtractColor:
         html = '<span style="color:#fc3">x</span><b style="color:#fc3">y</b>'
         assert extract_color(html, None) == "#ffcc33"
 
+    def test_data_style不参与计数(self):
+        # #123456 为可配色——若 data-style 被误收则返回它而非 None
+        html = '<div data-style="color:#123456">x</div>'
+        assert extract_color(html, None) is None
+
 
 class TestExtractLogoUrl:
     def test_取日期新者(self):