chore: release v2.4

- Add theme system (Dark/Light palettes, ModernTheme, ThemeManager)
- Add InputDialog, Spinner common view
- Add DuplicatesCsvExportService
- Refresh views, dialogs, and view models across tabs
- Update localization strings (en/fr)
- Tweak services (transfer, permissions, search, user access, ownership elevation, bulk operations)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

SharepointToolbox/Views/Dialogs/InputDialog.xaml

@@ -0,0 +1,22 @@
+<Window x:Class="SharepointToolbox.Views.Dialogs.InputDialog"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="Input"
+        Width="340" Height="140"
+        WindowStartupLocation="CenterOwner"
+        Background="{DynamicResource AppBgBrush}"
+        Foreground="{DynamicResource TextBrush}"
+        TextOptions.TextFormattingMode="Ideal"
+        ResizeMode="NoResize">
+    <DockPanel Margin="12">
+        <StackPanel DockPanel.Dock="Bottom" Orientation="Horizontal"
+                    HorizontalAlignment="Right" Margin="0,10,0,0">
+            <Button Content="Cancel" Width="70" IsCancel="True" Margin="0,0,8,0"
+                    Click="Cancel_Click" />
+            <Button Content="OK" Width="70" IsDefault="True"
+                    Click="Ok_Click" />
+        </StackPanel>
+        <TextBlock x:Name="PromptText" DockPanel.Dock="Top" Margin="0,0,0,6" />
+        <TextBox x:Name="ResponseBox" VerticalContentAlignment="Center" Padding="4" />
+    </DockPanel>
+</Window>