chore: archive v1.1 Enhanced Reports milestone

v1.1 shipped with 4 phases (25 plans), 10/10 requirements complete:
- Global site selection (toolbar picker, all tabs consume)
- User access audit (Graph people-picker, direct/group/inherited)
- Simplified permissions (plain-language labels, risk levels, detail toggle)
- Storage visualization (LiveCharts2 pie/donut + bar charts)

Post-phase polish: centralized site selection (removed per-tab pickers),
claims prefix stripping, StorageMetrics backfill, chart tooltip fix,
summary stats in app + HTML exports.

205 tests passing, 10,484 LOC.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

SharepointToolbox/Views/Tabs/DuplicatesView.xaml

@@ -6,11 +6,6 @@
         <!-- Options panel -->
         <ScrollViewer DockPanel.Dock="Left" Width="240" VerticalScrollBarVisibility="Auto" Margin="8,8,4,8">
             <StackPanel>
-                <Label Content="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[lbl.site.url]}" />
-                <TextBox Text="{Binding SiteUrl, UpdateSourceTrigger=PropertyChanged}"
-                         IsEnabled="{Binding IsRunning, Converter={StaticResource InverseBoolConverter}}"
-                         Height="26" Margin="0,0,0,8" />
-
                 <GroupBox Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[grp.dup.type]}" Margin="0,0,0,8">
                     <StackPanel Margin="4">
                         <RadioButton Content="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[rad.dup.files]}"