feat: US-006 - Render live dashboard behind login with blur overlay

src/App.tsx

@@ -73,16 +73,16 @@ function App() {
           />
        )}
 
-        {phase === 'login' && (
-          <LoginScreen onComplete={() => setPhase('pmr')} />
-        )}
-
-        {phase === 'pmr' && (
+        {(phase === 'login' || phase === 'pmr') && (
           <DetailPanelProvider>
             <DashboardLayout />
           </DetailPanelProvider>
         )}
 
+        {phase === 'login' && (
+          <LoginScreen onComplete={() => setPhase('pmr')} />
+        )}
+
         {(phase === 'boot' || phase === 'ecg') && (
           <SkipButton onSkip={skipToLogin} />
         )}

src/components/LoginScreen.tsx

@@ -147,7 +147,11 @@ export function LoginScreen({ onComplete }: LoginScreenProps) {
   return (
     <div
       className="fixed inset-0 flex items-center justify-center z-50"
-      style={{ backgroundColor: '#1A2B2A' }}
+      style={{
+        backgroundColor: 'rgba(240, 245, 244, 0.7)',
+        backdropFilter: 'blur(20px)',
+        WebkitBackdropFilter: 'blur(20px)',
+      }}
       role="dialog"
       aria-label="Clinical system login"
       aria-modal="true"