Refactor device event handling and improve icon loading in InstalledAppsWidget

- Updated DeviceInfoWidget to include necessary headers for UI components.
- Modified DiskUsageWidget to enable debug mode for gallery usage.
- Enhanced iDescriptor.h by adding new AddType for pairing failures.
- Replaced QLabel with IDLoadingIconLabel in InstalledAppsWidget for better icon handling.
- Implemented asynchronous icon loading in InstalledAppsWidget using a queue.
- Improved event handling in main window to differentiate between connection states.
- Added alreadyExists method in NetworkDeviceCard to handle already connected devices.
- Updated Rust dependencies and added new header for device event subscription.
- Refactored Rust code to improve device pairing logic and event callback handling.

src/diskusagewidget.cpp

@@ -516,8 +516,13 @@ void DiskUsageWidget::fetchData()
             return result;
         }
 
-        result["galleryUsage"] = QVariant::fromValue(uint64_t(0));
-        return result;
+        // FIXME:
+        // bool debug = qgetenv("ID_DESCRIPTOR_DEBUG_GALLERY_USAGE") == "1";
+        bool debug = true;
+        if (debug) {
+            result["galleryUsage"] = QVariant::fromValue(uint64_t(0));
+            return result;
+        }
 
         const size_t CHUNK_SIZE = 256 * 1024;
         uint8_t *db_data = nullptr;