fix(nav): keep long More-menu tile labels inside their tile

The More hub grid tile label was a flex child without min-w-0, so
long compound labels (e.g. "Benachrichtigungen") painted past the
tile's rounded border instead of wrapping. Give the span min-w-0
and tightened leading so it wraps cleanly within the tile.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/layout/bottom-nav.tsx

@@ -255,7 +255,9 @@ export function BottomNav() {
                   )}
                 >
                   <item.icon className="h-5 w-5 shrink-0" aria-hidden="true" />
-                  <span className="text-sm font-medium">{t(item.tKey)}</span>
+                  <span className="min-w-0 text-sm font-medium leading-tight">
+                    {t(item.tKey)}
+                  </span>
                 </Link>
               );
             })}