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/store/workflowStore.ts

@@ -1,7 +1,23 @@
 import { create } from 'zustand';
-import { Workflow, WorkflowRun } from './gatewayStore';
 import type { GatewayClient } from '../lib/gateway-client';
 
+// === Core Types (previously imported from gatewayStore) ===
+
+export interface Workflow {
+  id: string;
+  name: string;
+  steps: number;
+  description?: string;
+  createdAt?: string;
+}
+
+export interface WorkflowRun {
+  runId: string;
+  status: string;
+  step?: string;
+  result?: unknown;
+}
+
 // === Types ===
 
 interface RawWorkflowRun {
@@ -256,8 +272,7 @@ export const useWorkflowStore = create<WorkflowStateSlice & WorkflowActionsSlice
   },
 }));
 
-// Re-export types from gatewayStore for convenience
-export type { Workflow, WorkflowRun };
+// Types are now defined locally in this file (no longer imported from gatewayStore)
 
 // === Client Injection ===