fix: fluid section title with clamp() to prevent wrapping below 900px

src/shared/styles/theme.css

@@ -20,6 +20,9 @@
   --font-weight-body: 600;
   --font-weight-normal: 400;
 
+  /* Fluid section title: scales from 2rem at ~267px to 8rem at ~1707px */
+  --text-section-title: clamp(2rem, 7.5vw, 8rem);
+
   /* === LINE HEIGHT === */
   --line-height-tight: 1.2;
   --line-height-normal: 1.5;