fix(rag): Final RAG stability and status fixes

- Corrected GeminiEmbeddingProvider model name to gemini-embedding-001.
- Prevented _fetch_models from overwriting active i_status (sending/done/error).
- Updated 	est_rag_engine.py to correctly patch the lazy-loaded chromadb getter.
- Adjusted RAG simulation tests to account for the new initializing... status and automatic initial indexing.
- Fixed typo in 	est_z_negative_flows.py.

src/app_controller.py

@@ -1983,8 +1983,10 @@ class AppController:
     if self.current_model not in models_list and models_list:
      self.current_model = models_list[0]
      ai_client.set_provider(self._current_provider, self.current_model)
+    if self.ai_status == "fetching models...":
      self.ai_status = f"models loaded: {len(models_list)}"
    except Exception as e:
+    if self.ai_status == "fetching models...":
      self.ai_status = f"model fetch error: {e}"
   self.models_thread = threading.Thread(target=do_fetch, daemon=True)
   self.models_thread.start()

tests/test_rag_engine.py

@@ -19,14 +19,17 @@ def test_rag_engine_init_mock(mock_rag_config):
  assert engine.collection == "mock"
 
 @patch('src.rag_engine.LocalEmbeddingProvider.embed')
-@patch('src.rag_engine.chromadb.PersistentClient')
+@patch('src.rag_engine._get_chromadb')
-def test_rag_engine_chroma(mock_chroma, mock_embed):
+def test_rag_engine_chroma(mock_get_chroma, mock_embed):
- mock_embed.return_value = [[0.1, 0.2, 0.3]]
+ mock_chroma = MagicMock()
+ mock_settings = MagicMock()
+ mock_get_chroma.return_value = (mock_chroma, mock_settings)
 
+ mock_embed.return_value = [[0.1, 0.2, 0.3]]
  mock_collection = MagicMock()
  mock_client = MagicMock()
  mock_client.get_or_create_collection.return_value = mock_collection
- mock_chroma.return_value = mock_client
+ mock_chroma.PersistentClient.return_value = mock_client
 
  vs_config = models.VectorStoreConfig(provider='chroma', collection_name='test')
  config = models.RAGConfig(enabled=True, vector_store=vs_config, embedding_provider='local')

tests/test_rag_visual_sim.py

@@ -29,7 +29,7 @@ def test_rag_full_lifecycle_sim(live_gui):
   
   # 3. Verify initial status
   status = client.get_value('rag_status')
-  assert status in ['idle', 'ready'], f"Unexpected initial status: {status}"
+  assert status in ['idle', 'ready', 'initializing...'], f"Unexpected initial status: {status}"
   
   # 4. Trigger Rebuild Index
   print("[SIM] Triggering index rebuild...")