feat: Improve dragstart handler installation with retry logic for Angular handlers

src/webdrop_bridge/ui/bridge_script_intercept.js

@@ -65,9 +65,15 @@
   // PART 3: Install OUR dragstart handler in capture phase
   // ============================================================================
   
-  setTimeout(function() {
+  function installDragHandler() {
     console.log('[Intercept] Installing dragstart handler, have', angularDragHandlers.length, 'Angular handlers');
     
+    if (angularDragHandlers.length === 0) {
+      console.warn('[Intercept] No Angular handlers found yet, will retry in 1s...');
+      setTimeout(installDragHandler, 1000);
+      return;
+    }
+    
     // Stop intercepting addEventListener
     listenerPatchActive = false;
     
@@ -124,7 +130,11 @@
     }, true); // Capture phase
     
     console.log('[Intercept] dragstart handler installed ✓');
-  }, 1500); // Wait for Angular to register its listeners
+  }
+  
+  // 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)
+  setTimeout(installDragHandler, 2000);
   
   // ============================================================================
   // PART 3: QWebChannel connection