Add iOS & Android build + frontend fixes for desktop

frontend/src/components/MedicineResults.css

@@ -3,6 +3,10 @@
   grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
   gap: 1.25rem;
   margin-top: 1rem;
+  max-height: 60vh;
+  overflow-y: auto;
+  overscroll-behavior: contain;
+  padding: 0.5rem 0.5rem 0.5rem 0;
   animation: fadeInUp 0.8s ease-out 0.4s backwards;
 }
 

frontend/src/main.jsx

@@ -2,6 +2,7 @@ import React from 'react';
 import ReactDOM from 'react-dom/client';
 import App from './App';
 import './index.css';
+import { initNativeShell } from './utils/native';
 
 ReactDOM.createRoot(document.getElementById('root')).render(
   <React.StrictMode>
@@ -9,3 +10,5 @@ ReactDOM.createRoot(document.getElementById('root')).render(
   </React.StrictMode>
 );
 
+initNativeShell();
+

frontend/src/utils/native.js

@@ -0,0 +1,38 @@
+// Capacitor bootstrap — no-ops on the web, configures native shell on mobile.
+// Plugins are dynamic-imported so the web bundle isn't penalized.
+
+let initStarted = false;
+
+export function isNativeApp() {
+  return typeof window !== 'undefined' && Boolean(window.Capacitor?.isNativePlatform?.());
+}
+
+export async function initNativeShell() {
+  if (initStarted || !isNativeApp()) return;
+  initStarted = true;
+
+  try {
+    const { StatusBar, Style } = await import('@capacitor/status-bar');
+    await StatusBar.setBackgroundColor({ color: '#0f766e' }).catch(() => {});
+    await StatusBar.setStyle({ style: Style.Light }).catch(() => {});
+  } catch {
+    /* plugin not present — fine on web */
+  }
+
+  try {
+    const { SplashScreen } = await import('@capacitor/splash-screen');
+    await SplashScreen.hide({ fadeOutDuration: 250 }).catch(() => {});
+  } catch {
+    /* plugin not present — fine on web */
+  }
+
+  try {
+    const { App } = await import('@capacitor/app');
+    App.addListener('backButton', ({ canGoBack }) => {
+      if (canGoBack) window.history.back();
+      else App.exitApp();
+    });
+  } catch {
+    /* plugin not present — fine on web */
+  }
+}