Indexing: Refresh UI after full scan completes

- Emit `index-dir-updated` with `["/"]` after aggregation completes so both panes refresh and show directory sizes immediately
- Previously, sizes only appeared after the user navigated or scrolled

Author: vdavid

apps/desktop/src-tauri/src/indexing/mod.rs

@@ -599,6 +599,15 @@ impl IndexManager {
                     // the progress overlay.
                     let _ = app.emit("index-aggregation-complete", ());
 
+                    // Tell the frontend to refresh all visible listings — directory
+                    // sizes are now available for the first time after a full scan.
+                    let _ = app.emit(
+                        "index-dir-updated",
+                        IndexDirUpdatedEvent {
+                            paths: vec!["/".to_string()],
+                        },
+                    );
+
                     // Open a read connection for path resolution during replay
                     let replay_conn = match IndexStore::open_write_connection(&writer.db_path()) {
                         Ok(c) => c,