fix: change mobile terminal wrapper from grid to flexbox

Grid layout was not properly sizing the content area, causing 0 height.
Flexbox with flex: 1 on content area ensures proper filling.

apps/web/src/styles.css

@@ -3122,8 +3122,8 @@ a.nav-item,
 }
 
 .mobile-terminal-wrapper {
-  display: grid;
-  grid-template-rows: auto 1fr auto;
+  display: flex;
+  flex-direction: column;
   height: 100%;
   min-height: 0;
   background: #1e1e1e;