fix: improve drag handler installation logic to prevent multiple installations and enhance retry mechanism

src/webdrop_bridge/ui/bridge_script_intercept.js

@@ -15,6 +15,7 @@
     var angularDragHandlers = [];
     var originalAddEventListener = EventTarget.prototype.addEventListener;
     var listenerPatchActive = true;
+    var dragHandlerInstalled = false;
     
     // Capture Authorization token from XHR requests
     window.capturedAuthToken = null;
@@ -75,8 +76,16 @@
       return;
     }
     
-    // Stop intercepting addEventListener
+    // Only install once, even if called multiple times
-    listenerPatchActive = false;
+    if (dragHandlerInstalled) {
+      console.log('[Intercept] Handler already installed, skipping');
+      return;
+    }
+    
+    dragHandlerInstalled = true;
+    
+    // NOTE: Keep listenerPatchActive = true to catch new Angular handlers registered later
+    // This is important for page reloads where Angular might register handlers at different times
     
     // Register OUR handler in capture phase
     originalAddEventListener.call(document, 'dragstart', function(e) {
@@ -150,8 +159,23 @@
   }
   
   // Wait for Angular to register its listeners, then install our handler
-  // Start checking after 2 seconds (give Angular time to load on first page load)
+  // Start checking after 3 seconds (give Angular time to load), then retry for up to 30 seconds
-  setTimeout(installDragHandler, 2000);
+  var installRetries = 0;
+  var maxRetries = 27; // 3 initial + 27 retries * 1s = 30s total
+  
+  function scheduleInstall() {
+    if (dragHandlerInstalled) return; // Already done
+    installRetries++;
+    console.log('[Intercept] Install attempt', installRetries, '/', maxRetries + 3);
+    installDragHandler();
+    if (!dragHandlerInstalled && installRetries < maxRetries) {
+      setTimeout(scheduleInstall, 1000);
+    } else if (!dragHandlerInstalled) {
+      console.warn('[Intercept] Gave up waiting for Angular handlers after 30s');
+    }
+  }
+  
+  setTimeout(scheduleInstall, 3000);
   
   // ============================================================================
   // PART 3: QWebChannel connection