SEO: fix garbled blog article HTML, update H1, fix BI dashboard description

data-quality-validation-pipelines.php:
- Fix H1 to match title (was still "Advanced Statistical Validation..." after title was updated)
- Remove 3 orphaned text fragments from broken AI edit merges ("racy and reliability.", "ta pipelines...", "ust in your analytics.")
- Fix split <strong> tag mid-word
- Fix internal link from /services/web-scraping-services.php to /services/web-scraping

business-intelligence-dashboard-design.php:
- Rewrite meta description - old one concatenated with title into bizarre GSC query
  "2025 ux best practices for displaying data analysis results competitive intelligence dashboard..."
  (74 impressions, 0 clicks)

blog/articles/business-intelligence-dashboard-design.php

@@ -4,7 +4,7 @@ header('Strict-Transport-Security: max-age=31536000; includeSubDomains');
 
 // Article-specific SEO variables
 $article_title = "BI Dashboard Design: 2025 UX Best Practices";
-$article_description = "Design effective BI & competitive intelligence dashboards. Our guide covers 2025 UX best practices for data display, user feedback, and actionable insig...";
+$article_description = "How to design effective business intelligence dashboards that turn complex data into clear decisions. Practical guide for UK data teams.";
 $article_keywords = "business intelligence dashboard, BI dashboard design, data visualisation, dashboard UX, analytics dashboard, KPI dashboard";
 $article_author = "David Martinez";
 $canonical_url = "https://ukdataservices.co.uk/blog/articles/business-intelligence-dashboard-design.php";