refactor(store): split gatewayStore into specialized domain stores

Major restructuring:
- Split monolithic gatewayStore into 5 focused stores:
  - connectionStore: WebSocket connection and gateway lifecycle
  - configStore: quickConfig, workspaceInfo, MCP services
  - agentStore: clones, usage stats, agent management
  - handStore: hands, approvals, triggers, hand runs
  - workflowStore: workflows, workflow runs, execution

- Update all components to use new stores with selector pattern
- Remove

desktop/src/components/WorkflowList.tsx

@@ -7,8 +7,7 @@
  */
 
 import { useState, useEffect, useCallback } from 'react';
-import { useGatewayStore } from '../store/gatewayStore';
-import type { Workflow } from '../store/gatewayStore';
+import { useWorkflowStore, type Workflow } from '../store/workflowStore';
 import { WorkflowEditor } from './WorkflowEditor';
 import { WorkflowHistory } from './WorkflowHistory';
 import {
@@ -236,7 +235,13 @@ function WorkflowRow({ workflow, onExecute, onEdit, onDelete, onHistory, isExecu
 // === Main WorkflowList Component ===
 
 export function WorkflowList() {
-  const { workflows, loadWorkflows, executeWorkflow, deleteWorkflow, createWorkflow, updateWorkflow, isLoading } = useGatewayStore();
+  const workflows = useWorkflowStore((s) => s.workflows);
+  const loadWorkflows = useWorkflowStore((s) => s.loadWorkflows);
+  const triggerWorkflow = useWorkflowStore((s) => s.triggerWorkflow);
+  const deleteWorkflow = useWorkflowStore((s) => s.deleteWorkflow);
+  const createWorkflow = useWorkflowStore((s) => s.createWorkflow);
+  const updateWorkflow = useWorkflowStore((s) => s.updateWorkflow);
+  const isLoading = useWorkflowStore((s) => s.isLoading);
   const [viewMode, setViewMode] = useState<ViewMode>('list');
   const [executingWorkflowId, setExecutingWorkflowId] = useState<string | null>(null);
   const [deletingWorkflowId, setDeletingWorkflowId] = useState<string | null>(null);
@@ -254,11 +259,11 @@ export function WorkflowList() {
   const handleExecute = useCallback(async (id: string, input?: Record<string, unknown>) => {
     setExecutingWorkflowId(id);
     try {
-      await executeWorkflow(id, input);
+      await triggerWorkflow(id, input);
     } finally {
       setExecutingWorkflowId(null);
     }
-  }, [executeWorkflow]);
+  }, [triggerWorkflow]);
 
   const handleExecuteClick = useCallback((workflow: Workflow) => {
     setSelectedWorkflow(workflow);