fix(team): resolve TypeScript errors in team collaboration module

- Remove unused imports and variables in Team components
- Fix CollaborationEvent type import in useTeamEvents
- Add proper type guards for Hand status in gatewayStore
- Fix Session status type compatibility in gateway-client
- Remove unused getGatewayClient import from teamStore
- Handle unknown payload types in TeamCollaborationView

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src/components/TeamOrchestrator.tsx

@@ -7,11 +7,10 @@
  * @module components/TeamOrchestrator
  */
 
-import { useState, useEffect, useCallback } from 'react';
+import { useState, useEffect } from 'react';
 import { useTeamStore } from '../store/teamStore';
 import { useGatewayStore } from '../store/gatewayStore';
 import type {
-  Team,
   TeamMember,
   TeamTask,
   TeamMemberRole,
@@ -19,9 +18,9 @@ import type {
   CollaborationPattern,
 } from '../types/team';
 import {
-  Users, Plus, Trash2, Edit2, Check, X, ChevronDown, ChevronUp,
-  Bot, GitBranch, ArrowRight, Clock, AlertTriangle, CheckCircle,
-  Play, Pause, Settings, UserPlus, FileText, Activity,
+  Users, Plus, Trash2, X,
+  Bot, Clock, AlertTriangle, CheckCircle,
+  Play, UserPlus, FileText,
 } from 'lucide-react';
 
 // === Sub-Components ===
@@ -115,7 +114,7 @@ interface TaskCardProps {
   onStatusChange: (status: TeamTask['status']) => void;
 }
 
-function TaskCard({ task, members, isSelected, onSelect, onAssign, onStatusChange }: TaskCardProps) {
+function TaskCard({ task, members, isSelected, onSelect, onAssign, onStatusChange: _onStatusChange }: TaskCardProps) {
   const [showAssignMenu, setShowAssignMenu] = useState(false);
 
   const priorityColors: Record<TaskPriority, string> = {
@@ -216,7 +215,6 @@ export function TeamOrchestrator({ isOpen, onClose }: TeamOrchestratorProps) {
     teams,
     activeTeam,
     metrics,
-    isLoading,
     error,
     selectedTaskId,
     selectedMemberId,