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/TriggersPanel.tsx

@@ -5,8 +5,8 @@
  */
 
 import { useState, useEffect, useCallback } from 'react';
-import { useGatewayStore } from '../store/gatewayStore';
-import type { Trigger } from '../store/gatewayStore';
+import { useHandStore } from '../store/handStore';
+import type { Trigger } from '../store/handStore';
 import { CreateTriggerModal } from './CreateTriggerModal';
 import {
   Zap,
@@ -105,7 +105,11 @@ function TriggerCard({ trigger, onToggle, onDelete, isToggling, isDeleting }: Tr
 }
 
 export function TriggersPanel() {
-  const { triggers, loadTriggers, isLoading, client, deleteTrigger } = useGatewayStore();
+  const triggers = useHandStore((s) => s.triggers);
+  const loadTriggers = useHandStore((s) => s.loadTriggers);
+  const deleteTrigger = useHandStore((s) => s.deleteTrigger);
+  const isLoading = useHandStore((s) => s.isLoading);
+  const client = useHandStore((s) => s.client);
   const [togglingTrigger, setTogglingTrigger] = useState<string | null>(null);
   const [deletingTrigger, setDeletingTrigger] = useState<string | null>(null);
   const [refreshing, setRefreshing] = useState(false);