Fix navbar across all pages: add nav include, fonts, active state, spacing, stats, error pages

- Add nav.php include to 5 missing pages (cost-calculator, thank-you, 403, 404, 500)
- Add ErrorDocument directives to .htaccess for custom 403/404/500 pages
- Fix bogus accuracy stats (homepage, web-scraping, location pages)
- Fix invisible CTA buttons on property and financial service pages
- Add Google Fonts (Roboto Slab + Lato) to all pages missing it (tools, blog articles, error pages)
- Add active nav link highlighting (teal underline for current page)
- Improve footer contrast to WCAG AA, equal-height cards, mobile text scaling
- Consistent navbar-to-content spacing across all pages
- Bump cache version to v1.1.3

services/web-scraping.php

@@ -592,7 +592,7 @@ $breadcrumbs = [
                     <span class="stat-label">Projects Delivered</span>
                 </div>
                 <div class="stat">
-                    <span class="stat-number">99.8%</span>
+                    <span class="stat-number">99.7%</span>
                     <span class="stat-label">Data Accuracy</span>
                 </div>
                 <div class="stat">
@@ -667,7 +667,7 @@ $breadcrumbs = [
                     <p>From simple static pages to complex JavaScript applications, we handle all website technologies. Extract from one site or thousands simultaneously with our scalable infrastructure.</p>
                 </div>
                 <div class="feature-card">
-                    <h3>99.8% Data Accuracy</h3>
+                    <h3>99.7% Data Accuracy</h3>
                     <p>Multi-layer validation, automated quality checks, and human review processes ensure the data you receive is accurate, complete, and properly formatted.</p>
                 </div>
                 <div class="feature-card">