corp-app/CORP-MAUI/Pages/ChatPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:CORP_MAUI.Pages"
             x:Class="CORP_MAUI.Pages.ChatPage"
             Title="Чат">

    <Grid RowDefinitions="Auto,*,Auto">
        
        <!-- Шапка с информацией о собеседнике -->
        <Border 
            Grid.Row="0"
            Padding="15"
            BackgroundColor="{StaticResource Primary}"
            Shadow="{Shadow Brush=Black, Opacity=0.3, Offset='0,2', Radius=4}">
            
            <Grid ColumnDefinitions="Auto,Auto,*">
                <!-- Кнопка "Назад" -->
                <Button 
                    Grid.Column="0"
                    Text="←"
                    FontSize="24"
                    TextColor="White"
                    BackgroundColor="Transparent"
                    WidthRequest="40"
                    HeightRequest="40"
                    Padding="0"
                    VerticalOptions="Center"
                    Clicked="OnBackButtonClicked"/>
                
                <!-- Аватар -->
                <Border 
                    Grid.Column="1"
                    WidthRequest="50"
                    HeightRequest="50"
                    StrokeShape="RoundRectangle 25"
                    Padding="0"
                    Margin="10,0,0,0"
                    BackgroundColor="White">
                    <Image 
                        x:Name="RecipientAvatar"
                        Source="dotnet_bot.png"
                        Aspect="AspectFill"/>
                </Border>

                <!-- Информация о собеседнике -->
                <VerticalStackLayout 
                    Grid.Column="2"
                    VerticalOptions="Center"
                    Margin="10,0,0,0">
                    <Label 
                        x:Name="RecipientName"
                        Text="Выберите собеседника"
                        FontSize="18"
                        FontAttributes="Bold"
                        TextColor="White"/>
                    <Label 
                        x:Name="RecipientStatus"
                        Text="Offline"
                        FontSize="12"
                        TextColor="White"
                        Opacity="0.8"/>
                </VerticalStackLayout>
            </Grid>
        </Border>

        <!-- Список сообщений -->
        <CollectionView 
            Grid.Row="1"
            x:Name="MessagesCollectionView"
            SelectionMode="None"
            Margin="10">
            <CollectionView.ItemTemplate>
                <DataTemplate x:DataType="{x:Type local:MessageViewModel}">
                    <Grid Padding="5">
                        <!-- Сообщение отправленное -->
                        <Border 
                            HorizontalOptions="End"
                            MaximumWidthRequest="300"
                            BackgroundColor="{StaticResource Primary}"
                            StrokeShape="RoundRectangle 15"
                            Padding="10"
                            Margin="50,0,0,0"
                            Shadow="{Shadow Brush=Black, Opacity=0.2, Offset='0,1', Radius=3}">
                            <Border.Triggers>
                                <DataTrigger TargetType="Border" Binding="{Binding IsMyMessage}" Value="False">
                                    <Setter Property="HorizontalOptions" Value="Start"/>
                                    <Setter Property="BackgroundColor" Value="{StaticResource Gray200}"/>
                                    <Setter Property="Margin" Value="0,0,50,0"/>
                                </DataTrigger>
                            </Border.Triggers>

                            <VerticalStackLayout Spacing="5">
                                <Label 
                                    Text="{Binding SenderName}"
                                    FontSize="12"
                                    FontAttributes="Bold"
                                    TextColor="White">
                                    <Label.Triggers>
                                        <DataTrigger TargetType="Label" Binding="{Binding IsMyMessage}" Value="False">
                                            <Setter Property="TextColor" Value="{StaticResource Gray900}"/>
                                        </DataTrigger>
                                    </Label.Triggers>
                                </Label>

                                <Label 
                                    Text="{Binding Content}"
                                    FontSize="14"
                                    TextColor="White">
                                    <Label.Triggers>
                                        <DataTrigger TargetType="Label" Binding="{Binding IsMyMessage}" Value="False">
                                            <Setter Property="TextColor" Value="{StaticResource Gray900}"/>
                                        </DataTrigger>
                                    </Label.Triggers>
                                </Label>

                                <Label 
                                    Text="{Binding Timestamp, StringFormat='{0:HH:mm}'}"
                                    FontSize="10"
                                    HorizontalOptions="End"
                                    TextColor="White"
                                    Opacity="0.7">
                                    <Label.Triggers>
                                        <DataTrigger TargetType="Label" Binding="{Binding IsMyMessage}" Value="False">
                                            <Setter Property="TextColor" Value="{StaticResource Gray600}"/>
                                        </DataTrigger>
                                    </Label.Triggers>
                                </Label>
                            </VerticalStackLayout>
                        </Border>
                    </Grid>
                </DataTemplate>
            </CollectionView.ItemTemplate>
        </CollectionView>

        <!-- Панель ввода сообщения -->
        <Border 
            Grid.Row="2"
            Padding="10"
            BackgroundColor="{StaticResource Gray100}"
            Shadow="{Shadow Brush=Black, Opacity=0.3, Offset='0,-2', Radius=4}">
            
            <Grid ColumnDefinitions="*,Auto">
                <Entry 
                    x:Name="MessageEntry"
                    Grid.Column="0"
                    Placeholder="Введите сообщение..."
                    PlaceholderColor="{StaticResource Gray400}"
                    TextColor="{StaticResource Gray900}"
                    BackgroundColor="White"
                    HeightRequest="45"
                    VerticalOptions="Center"
                    TextChanged="OnMessageTextChanged"
                    Completed="OnSendMessageClicked"/>

                <Button 
                    Grid.Column="1"
                    x:Name="SendButton"
                    Text="➤"
                    FontSize="24"
                    WidthRequest="50"
                    HeightRequest="45"
                    BackgroundColor="{StaticResource Primary}"
                    TextColor="White"
                    CornerRadius="10"
                    Margin="10,0,0,0"
                    Clicked="OnSendMessageClicked"/>
            </Grid>
        </Border>

        <!-- Индикатор подключения -->
        <Border 
            Grid.Row="1"
            x:Name="ConnectionIndicator"
            IsVisible="False"
            BackgroundColor="{StaticResource Secondary}"
            Padding="10"
            StrokeShape="RoundRectangle 20"
            VerticalOptions="Start"
            HorizontalOptions="Center"
            Margin="0,10,0,0"
            Shadow="{Shadow Brush=Black, Opacity=0.3, Offset='0,2', Radius=4}">
            <Label 
                Text="Подключение..."
                TextColor="White"
                FontSize="12"/>
        </Border>

    </Grid>
    
</ContentPage>