fix: avoid web fallback after app handoff

app.js

@@ -60,11 +60,87 @@ function isMobileDevice() {
   return /Android|iPhone|iPad|iPod/i.test(navigator.userAgent);
 }
 
-function getMobileUrl(service) {
+function getMobilePlatform() {
+  const userAgent = navigator.userAgent || '';
+  if (/Android/i.test(userAgent)) return 'android';
+  if (/iPhone|iPad|iPod/i.test(userAgent)) return 'ios';
+  return 'other';
+}
+
+function getMobileLaunch(service) {
   if (service.id === 'drive') {
-    return 'nextcloud://openFiles';
+    const fallbackUrl = service.url;
+    if (getMobilePlatform() === 'android') {
+      return {
+        url: `intent://openFiles#Intent;scheme=nextcloud;package=com.nextcloud.client;S.browser_fallback_url=${encodeURIComponent(fallbackUrl)};end`,
+        fallbackUrl
+      };
+    }
+    return {
+      url: 'nextcloud://openFiles',
+      fallbackUrl
+    };
   }
-  return service.mobileUrl;
+  if (!service.mobileUrl) return null;
+  return {
+    url: service.mobileUrl,
+    fallbackUrl: service.url
+  };
+}
+
+function openMobileLaunch(url, fallbackUrl) {
+  let didLeavePage = false;
+  let fallbackTimer = null;
+  let cleanupTimer = null;
+  let launcherFrame = null;
+
+  const cleanup = () => {
+    window.removeEventListener('pagehide', markPageLeft);
+    document.removeEventListener('visibilitychange', handleVisibilityChange);
+    if (fallbackTimer) window.clearTimeout(fallbackTimer);
+    if (cleanupTimer) window.clearTimeout(cleanupTimer);
+    if (launcherFrame) launcherFrame.remove();
+  };
+
+  const markPageLeft = () => {
+    didLeavePage = true;
+    cleanup();
+  };
+
+  const handleVisibilityChange = () => {
+    if (document.visibilityState === 'hidden') {
+      markPageLeft();
+    }
+  };
+
+  window.addEventListener('pagehide', markPageLeft, { once: true });
+  document.addEventListener('visibilitychange', handleVisibilityChange);
+
+  fallbackTimer = window.setTimeout(() => {
+    cleanup();
+    if (!didLeavePage && document.visibilityState === 'visible') {
+      window.location.href = fallbackUrl;
+    }
+  }, 2200);
+
+  if (/^https?:\/\//i.test(url) || /^intent:/i.test(url)) {
+    window.location.href = url;
+    return;
+  }
+
+  launcherFrame = document.createElement('iframe');
+  launcherFrame.hidden = true;
+  launcherFrame.style.display = 'none';
+  launcherFrame.setAttribute('aria-hidden', 'true');
+  document.body.appendChild(launcherFrame);
+  launcherFrame.src = url;
+
+  cleanupTimer = window.setTimeout(() => {
+    if (launcherFrame && launcherFrame.parentNode) {
+      launcherFrame.remove();
+      launcherFrame = null;
+    }
+  }, 2600);
 }
 
 function createServiceCard(service) {
@@ -92,28 +168,13 @@ function createServiceCard(service) {
     <span class="card-domain">${service.domain}</span>
   `;
 
-  const mobileUrl = getMobileUrl(service);
+  const mobileLaunch = getMobileLaunch(service);
-  if (mobileUrl) {
+  if (mobileLaunch) {
     card.addEventListener('click', (e) => {
       if (!isMobileDevice()) return;
 
       e.preventDefault();
-
+      openMobileLaunch(mobileLaunch.url, mobileLaunch.fallbackUrl);
-      if (/^https?:\/\//i.test(mobileUrl)) {
-        window.location.href = mobileUrl;
-        return;
-      }
-
-      const start = Date.now();
-      // Try to open the native mobile app through its registered URL scheme.
-      window.location.href = mobileUrl;
-
-      // Web fallback if the app is not installed or the scheme is not handled.
-      setTimeout(() => {
-        if (Date.now() - start < 1500) {
-          window.open(service.url, '_blank');
-        }
-      }, 800);
     });
   }
 

index.html

@@ -119,6 +119,6 @@
         </svg>
     </div>
 
-    <script src="/app.js?v=30" defer></script>
+    <script src="/app.js?v=31" defer></script>
 </body>
 </html>

sw.js

@@ -1,10 +1,10 @@
-const CACHE_NAME = 'mischlabs-pwa-v13';
+const CACHE_NAME = 'mischlabs-pwa-v14';
 const APP_SHELL = [
   '/',
   '/index.html',
   '/offline.html',
   '/style.css?v=27',
-  '/app.js?v=30',
+  '/app.js?v=31',
   '/services.json?v=1',
   '/manifest.webmanifest?v=4',
   '/favicon.ico?v=4',