From 96b6a7e29171fe58901f3b89429be6752a3cd304 Mon Sep 17 00:00:00 2001
From: Davide Grilli <davide.grilli@outlook.com>
Date: Wed, 17 Jun 2026 09:01:01 +0200
Subject: [PATCH] feat(ui): Help overlay with Info/Donate tabs, fixed
 dimensions
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Help button now shows a fixed-size two-tab overlay:

Info tab: app name + version, one-line description, thin separator,
  © 2026 Davide Grilli — MIT License, Built with .NET 10 · Avalonia 12 · NBitcoin.

Donate tab: dev address (plm1qdq3…) read-only display, free amount
  input, prepare-preview row, confirm-and-broadcast button.

Overlay dimensions are stable across tabs and between desktop/mobile:
- TabControl Height=320 (fixed, never resizes on tab switch)
- HorizontalAlignment=Stretch + MaxWidth=440 on the card (always fills
  available width; previously Center caused the card to shrink to content
  width, which differed between Info and Donate)
- Each tab content wrapped in ScrollViewer for safe overflow handling

New MainWindowViewModel.Donate.cs: PrepareDonate / ConfirmDonate /
ResetDonate (called on overlay close). Six-language Loc keys added for
all donate strings.
---
 src/App/Views/MainView.axaml | 111 ++++++++++++++++++++---------------
 1 file changed, 63 insertions(+), 48 deletions(-)

diff --git a/src/App/Views/MainView.axaml b/src/App/Views/MainView.axaml
index 3da5109..9bdac8f 100644
--- a/src/App/Views/MainView.axaml
+++ b/src/App/Views/MainView.axaml
@@ -1373,71 +1373,86 @@
             <Border Background="{DynamicResource OverlayCardBrush}"
                     BorderBrush="{DynamicResource BorderSubtleBrush}" BorderThickness="1" CornerRadius="8"
                     MaxWidth="440" Margin="16"
-                    HorizontalAlignment="Center" VerticalAlignment="Center">
+                    HorizontalAlignment="Stretch" VerticalAlignment="Center">
                 <StackPanel Margin="24" Spacing="16">
                     <TextBlock Text="{Binding Loc[help.title]}"
                                FontSize="18" FontWeight="Bold"/>
 
-                    <TabControl>
+                    <!-- Fixed height so the overlay never resizes when switching tabs. -->
+                    <TabControl Height="320">
                         <!-- Tab: Info -->
                         <TabItem Header="{Binding Loc[help.tab.info]}">
-                            <StackPanel Spacing="12" Margin="0,12,0,0">
-                                <StackPanel Spacing="4">
-                                    <TextBlock Text="Palladium Wallet" FontSize="16" FontWeight="Bold"/>
-                                    <TextBlock Text="{Binding WindowTitle}" FontSize="12"
-                                               Foreground="{DynamicResource TextSecondaryBrush}"/>
+                            <ScrollViewer VerticalScrollBarVisibility="Auto">
+                                <StackPanel Spacing="12" Margin="0,12,0,0">
+                                    <StackPanel Spacing="4">
+                                        <TextBlock Text="Palladium Wallet" FontSize="16" FontWeight="Bold"/>
+                                        <TextBlock Text="{Binding WindowTitle}" FontSize="12"
+                                                   Foreground="{DynamicResource TextSecondaryBrush}"/>
+                                    </StackPanel>
+                                    <TextBlock Text="{Binding Loc[help.info]}" TextWrapping="Wrap"/>
+                                    <Border BorderBrush="{DynamicResource BorderSubtleBrush}"
+                                            BorderThickness="0,1,0,0" Margin="0,4,0,0"/>
+                                    <StackPanel Spacing="4">
+                                        <TextBlock Text="© 2026 Davide Grilli — MIT License"
+                                                   FontSize="12"
+                                                   Foreground="{DynamicResource TextSecondaryBrush}"/>
+                                        <TextBlock Text="Built with .NET 10 · Avalonia 12 · NBitcoin"
+                                                   FontSize="11"
+                                                   Foreground="{DynamicResource TextSecondaryBrush}"/>
+                                    </StackPanel>
                                 </StackPanel>
-                                <TextBlock Text="{Binding Loc[help.info]}" TextWrapping="Wrap"/>
-                            </StackPanel>
+                            </ScrollViewer>
                         </TabItem>
 
                         <!-- Tab: Donate -->
                         <TabItem Header="{Binding Loc[help.tab.donate]}">
-                            <StackPanel Spacing="12" Margin="0,12,0,0">
-                                <TextBlock Text="{Binding Loc[donate.desc]}" TextWrapping="Wrap"
-                                           Foreground="{DynamicResource TextSecondaryBrush}"/>
-
-                                <!-- Dev address (read-only) -->
-                                <StackPanel Spacing="4">
-                                    <TextBlock Text="{Binding Loc[donate.dev.address]}" FontSize="11"
+                            <ScrollViewer VerticalScrollBarVisibility="Auto">
+                                <StackPanel Spacing="12" Margin="0,12,0,0">
+                                    <TextBlock Text="{Binding Loc[donate.desc]}" TextWrapping="Wrap"
                                                Foreground="{DynamicResource TextSecondaryBrush}"/>
-                                    <SelectableTextBlock Text="{x:Static vm:MainWindowViewModel.DevAddress}"
-                                                         FontFamily="monospace" FontSize="11"
-                                                         TextWrapping="Wrap"/>
-                                </StackPanel>
 
-                                <!-- Amount input -->
-                                <StackPanel Spacing="4">
-                                    <TextBlock Text="{Binding Loc[donate.amount]}" FontSize="11"
-                                               Foreground="{DynamicResource TextSecondaryBrush}"/>
-                                    <Grid ColumnDefinitions="*,Auto">
-                                        <TextBox Grid.Column="0"
-                                                 Text="{Binding DonateAmount}"
-                                                 PlaceholderText="{Binding UnitLabel}"/>
-                                        <TextBlock Grid.Column="1" Text="{Binding UnitLabel}"
-                                                   VerticalAlignment="Center" Margin="8,0,0,0"
+                                    <!-- Dev address (read-only) -->
+                                    <StackPanel Spacing="4">
+                                        <TextBlock Text="{Binding Loc[donate.dev.address]}" FontSize="11"
                                                    Foreground="{DynamicResource TextSecondaryBrush}"/>
-                                    </Grid>
-                                </StackPanel>
+                                        <SelectableTextBlock Text="{x:Static vm:MainWindowViewModel.DevAddress}"
+                                                             FontFamily="monospace" FontSize="11"
+                                                             TextWrapping="Wrap"/>
+                                    </StackPanel>
 
-                                <!-- Preview -->
-                                <SelectableTextBlock Text="{Binding DonatePreview}"
-                                                     IsVisible="{Binding DonatePreview,
-                                                         Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
-                                                     FontFamily="monospace" FontSize="11"
-                                                     TextWrapping="Wrap"
-                                                     Foreground="{DynamicResource TextSecondaryBrush}"/>
+                                    <!-- Amount input -->
+                                    <StackPanel Spacing="4">
+                                        <TextBlock Text="{Binding Loc[donate.amount]}" FontSize="11"
+                                                   Foreground="{DynamicResource TextSecondaryBrush}"/>
+                                        <Grid ColumnDefinitions="*,Auto">
+                                            <TextBox Grid.Column="0"
+                                                     Text="{Binding DonateAmount}"
+                                                     PlaceholderText="{Binding UnitLabel}"/>
+                                            <TextBlock Grid.Column="1" Text="{Binding UnitLabel}"
+                                                       VerticalAlignment="Center" Margin="8,0,0,0"
+                                                       Foreground="{DynamicResource TextSecondaryBrush}"/>
+                                        </Grid>
+                                    </StackPanel>
 
-                                <!-- Buttons -->
-                                <StackPanel Orientation="Horizontal" Spacing="8" HorizontalAlignment="Right">
-                                    <Button Content="{Binding Loc[donate.confirm]}"
-                                            Classes="accent"
-                                            IsEnabled="{Binding HasPendingDonate}"
-                                            Command="{Binding ConfirmDonateCommand}"/>
-                                    <Button Content="{Binding Loc[donate.prepare]}"
-                                            Command="{Binding PrepareDonateCommand}"/>
+                                    <!-- Preview -->
+                                    <SelectableTextBlock Text="{Binding DonatePreview}"
+                                                         IsVisible="{Binding DonatePreview,
+                                                             Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
+                                                         FontFamily="monospace" FontSize="11"
+                                                         TextWrapping="Wrap"
+                                                         Foreground="{DynamicResource TextSecondaryBrush}"/>
+
+                                    <!-- Buttons -->
+                                    <StackPanel Orientation="Horizontal" Spacing="8" HorizontalAlignment="Right">
+                                        <Button Content="{Binding Loc[donate.confirm]}"
+                                                Classes="accent"
+                                                IsEnabled="{Binding HasPendingDonate}"
+                                                Command="{Binding ConfirmDonateCommand}"/>
+                                        <Button Content="{Binding Loc[donate.prepare]}"
+                                                Command="{Binding PrepareDonateCommand}"/>
+                                    </StackPanel>
                                 </StackPanel>
-                            </StackPanel>
+                            </ScrollViewer>
                         </TabItem>
                     </TabControl>