feat: project override on runSavedFlow

Empty keeps the saved flow's own project:, then general (resolved
hub-side) — the wire field existed, the wrapper now exposes it.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/src/hub_client.dart

@@ -766,8 +766,13 @@ class HubClient {
     Map<String, String> textInputs = const {},
     Map<String, Uint8List> fileInputs = const {},
     Map<String, String> fileMimeTypes = const {},
+    String project = '',
   }) async {
-    final req = pb.RunSavedFlowRequest()..name = name;
+    // Project override for this run; empty keeps the saved flow's
+    // own `project:`, then `general` (resolved hub-side).
+    final req = pb.RunSavedFlowRequest()
+      ..name = name
+      ..project = project;
     for (final entry in textInputs.entries) {
       req.inputs[entry.key] = pb_common.Payload()..text = entry.value;
     }