fix: ensure namespace detail drawer has no transparency (#12)

Add explicit opacity: 1 to namespace detail drawer panel to prevent
any transparency issues in dark/light modes.

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Happy <yesreply@happy.engineering>

src/components/NamespacesListView.tsx

@@ -109,6 +109,7 @@ function NamespaceDetailPanel({ namespace, onClose }: NamespaceDetailPanelProps)
         overflowY: 'auto',
         zIndex: 1200,
         padding: '20px',
+        opacity: 1,
       }}
     >
       <div