Fix dark mode header text colors on CV page

- Update h1, h2, and h3 text colors to lighter blue in dark mode
- "Allen Hart" title and all section headers now visible in dark mode

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: AllenGrahamHart

assets/css/extended/cv-style.css

@@ -57,13 +57,19 @@
 
 /* Dark mode adjustments */
 .dark .cv-page h1 {
+    color: #7ab8e8;
     border-bottom-color: #7ab8e8;
 }
 
 .dark .cv-page h2 {
+    color: #7ab8e8;
     border-bottom-color: #7ab8e8;
 }
 
+.dark .cv-page h3 {
+    color: #7ab8e8;
+}
+
 .dark .cv-page .cv-contact {
     border-left-color: #7ab8e8;
 }