perf: reserve layout height for async sections to reduce CLS

Add min-height to taxonomy grids, hero numbers, and language
strip so skeleton placeholders hold space before API data loads.

Author: caiopizzol

apps/web/index.html

@@ -186,6 +186,7 @@
     .numbers {
       display: flex;
       gap: 48px;
+      min-height: 56px;
     }
 
     .num-val {
@@ -207,6 +208,7 @@
       padding: 24px 0;
       border-bottom: 1px solid #f0f0f0;
       margin-bottom: 24px;
+      min-height: 120px;
     }
 
     .section-label {
@@ -272,6 +274,7 @@
       padding: 0 0 24px;
       border-bottom: 1px solid #f0f0f0;
       margin-bottom: 24px;
+      min-height: 100px;
     }
 
     .lang-row {