Fix lab director section layout on mobile

- Stack image and text vertically on mobile view
- Reset negative margin on director figure for mobile

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: jeremymanning

css/style.css

@@ -1404,10 +1404,15 @@ body.homepage .site-header {
     }
 
     .two-column,
-    .two-column.reverse {
+    .two-column.reverse,
+    .two-column.lab-director {
         grid-template-columns: 1fr;
     }
 
+    .two-column.lab-director figure {
+        margin-top: 0;  /* Reset negative margin on mobile */
+    }
+
     /* People grid - single column on mobile */
     .people-grid {
         grid-template-columns: 1fr;