اريد تحسين التصميم هنا
 appBar: AppBar(
        toolbarHeight: 100,
        title: Row(
          children: [
            const SizedBox(width: 12),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                mainAxisSize: MainAxisSize.min,
                children: [
                  Text(
                    'تحويل ذكي',
                    style: TextStyle(
                      fontSize: 20,
                      fontWeight: FontWeight.bold,
                      fontFamily: tajawalFont,
                    ),
                    overflow: TextOverflow.ellipsis,
                  ),
                  const SizedBox(height: 8),
                  Container(
                    padding: const EdgeInsets.symmetric(
                      horizontal: 12,
                      vertical: 6,
                    ),
                    decoration: BoxDecoration(
                      color: lightColorScheme.surface.withOpacity(0.9),
                      borderRadius: BorderRadius.circular(12),
                      boxShadow: [
                        BoxShadow(
                          color: Colors.black.withOpacity(0.1),
                          blurRadius: 8,
                          offset: const Offset(0, 2),
                        ),
                      ],
                      gradient: LinearGradient(
                        colors: [
                          lightColorScheme.surfaceVariant.withOpacity(0.7),
                          lightColorScheme.surfaceVariant.withOpacity(0.4),
                        ],
                        begin: Alignment.topLeft,
                        end: Alignment.bottomRight,
                      ),
                    ),
                    child: Row(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        Icon(
                          Icons.account_balance_wallet_rounded,
                          size: 20,
                          color: lightColorScheme.primary,
                        ),
                        const SizedBox(width: 8),
                        Text(
                          'الرصيد: ${_formatWithThousandsSeparator(_currentBalance)}',
                          style: TextStyle(
                            fontSize: 16,
                            fontWeight: FontWeight.w600,
                            fontFamily: tajawalFont,
                            color: lightColorScheme.onSurface,
                          ),
                        ),
                      ],
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
        actions: [
          Tooltip(
            message: 'إدارة المبالغ المحفوظة',
            child: CircleAvatar(
              backgroundColor: lightColorScheme.primaryContainer.withOpacity(
                0.7,
              ),
              child: IconButton(
                icon: Icon(Icons.attach_money_rounded, color: Colors.white),
                onPressed: _showAmountsManagementDialog,
              ),
            ),
          ),
          SizedBox(width: 12),
          Tooltip(
            message: 'إدارة الأرقام المحفوظة',
            child: CircleAvatar(
              backgroundColor: lightColorScheme.primaryContainer.withOpacity(
                0.7,
              ),
              child: IconButton(
                icon: Icon(Icons.person, color: Colors.white),
                onPressed: _showSavedNumbersSelection,
              ),
            ),
          ),
          SizedBox(width: 12),
          Tooltip(
            message: 'إدارة الرقم السري',
            child: CircleAvatar(
              backgroundColor: lightColorScheme.primaryContainer.withOpacity(
                0.7,
              ),
              child: IconButton(
                icon: Icon(Icons.lock, color: Colors.white),
                onPressed: _showPinManagementDialog,
              ),
            ),
          ),
          const SizedBox(width: 12),

          // ** الزر الجديد لسجلات التحويل **
          if (_transferLogs
              .isNotEmpty) // إظهار الزر فقط إذا كانت هناك سجلات للتحويل
            Tooltip(
              message: 'سجل التحويلات السابقة',
              child: CircleAvatar(
                backgroundColor: lightColorScheme.primaryContainer.withOpacity(
                  0.7,
                ),
                child: IconButton(
                  icon: Icon(Icons.history_rounded, color: Colors.white),
                  onPressed: _showTransferLogsDialog,
                ),
              ),
            ),
          const SizedBox(width: 12),
        ],
        flexibleSpace: Container(
          decoration: BoxDecoration(
            gradient: LinearGradient(
              colors: [
                lightColorScheme.primary,
                lightColorScheme.primaryContainer,
              ],
              begin: Alignment.topLeft,
              end: Alignment.bottomRight,
            ),
            borderRadius: BorderRadius.vertical(bottom: Radius.circular(20)),
          ),
        ),
        elevation: 6,
        shadowColor: lightColorScheme.primary.withOpacity(0.4),
      ),