feat: Show node.name from workflow editor in debug panel

- Add name field to WorkflowNode model
- Add node_name field to NodeExecutionState
- Set node_name in execute_workflow from node.name
- Display priority: node_name > debug_prompt_slug > node_label > node_id

User sees 'Qualitätseinschätzung' instead of 'node_abc123'

backend/workflow_executor.py

@@ -166,10 +166,13 @@ async def execute_workflow(
                 enable_debug=enable_debug
             )
 
-            # Add human-readable label to node_state for debug UI
+            # Add human-readable label and name to node_state for debug UI
             node_label = node.prompt_slug if hasattr(node, 'prompt_slug') and node.prompt_slug else f"{node.type.value}-{node_id[:8]}"
             if not node_state.debug_prompt_slug:
                 node_state.debug_prompt_slug = node_label
+            # Set node_name from graph (user-defined name in editor)
+            if not node_state.node_name and hasattr(node, 'name'):
+                node_state.node_name = node.name
 
             node_states.append(node_state)
             context["node_results"][node_id] = node_state

backend/workflow_models.py

@@ -196,6 +196,7 @@ class WorkflowNode(BaseModel):
     """
     id: str = Field(..., description="Eindeutige Knoten-ID")
     type: NodeType = Field(..., description="Knotentyp")
+    name: Optional[str] = Field(None, description="Node-Name (vom Editor)")
     position: Optional[Position] = Field(None, description="Position im visuellen Editor")
 
     # ANALYSIS-Knoten
@@ -341,6 +342,7 @@ class NodeExecutionState(BaseModel):
     Erweitert NodeState um Phase-1-Komponenten (analysis_core, decision_signals, etc.)
     """
     node_id: str = Field(..., description="Knoten-ID")
+    node_name: Optional[str] = Field(None, description="Node-Name aus Workflow-Editor")
     status: NodeStatus = Field(..., description="Ausführungsstatus")
 
     # Phase 1 Result Container

frontend/src/components/workflow/panels/WorkflowResultViewer.jsx

@@ -226,7 +226,7 @@ export function WorkflowResultViewer({ result, onClose }) {
                       {(node.debug_node_type || node.node_type) === 'join' && '🔀'}
                       {(node.debug_node_type || node.node_type) === 'end' && '🏁'}
                       {' '}
-                      {node.debug_prompt_slug || node.node_label || ((node.debug_node_type || node.node_type) ? `${node.debug_node_type || node.node_type}-${node.node_id.substring(0, 8)}` : node.node_id)}
+                      {node.node_name || node.debug_prompt_slug || node.node_label || node.node_id}
                       {node.status === 'skipped' && (
                         <span style={{ color: 'var(--text3)', marginLeft: '8px' }}>
                           (skipped)