feat(import): add merge strategy and new-rundown destination to spreadsheet import

Co-authored-by: Carlos Valente <34649812+cpvalente@users.noreply.github.com>

apps/server/src/services/runtime-service/runtime.service.ts

@@ -165,6 +165,13 @@ class RuntimeService {
     }
   }
 
+  /**
+   * Returns the id of the currently loaded event, or null if none is loaded
+   */
+  public getLoadedEventId(): EntryId | null {
+    return runtimeState.getState().eventNow?.id ?? null;
+  }
+
   /**
    * Called when the underlying data has changed,
    * we check if the change affects the runtime