feat: add terminal panel components and Zustand store for state management

- Created a barrel export file for terminal panel components.
- Implemented Zustand store for managing terminal panel UI state, including visibility, active terminal, view mode, and terminal ordering.
- Added actions for opening/closing the terminal panel, setting the active terminal, changing view modes, and managing terminal order.
- Introduced selectors for accessing terminal panel state properties.

ccw/frontend/src/components/shared/LogBlock/LogBlock.tsx

@@ -2,7 +2,7 @@
 // LogBlock Component
 // ========================================
 
-import React, { memo } from 'react';
+import { memo } from 'react';
 import {
   ChevronDown,
   ChevronUp,

ccw/frontend/src/components/shared/LogBlock/LogBlockList.tsx

@@ -3,7 +3,7 @@
 // ========================================
 // Container component for displaying grouped CLI output blocks
 
-import { useState, useCallback, useMemo } from 'react';
+import { useState, useCallback } from 'react';
 import { useCliStreamStore, type LogBlockData } from '@/stores/cliStreamStore';
 import { LogBlock } from './LogBlock';