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/PermissionsView.xaml

@@ -28,21 +28,6 @@
                 DockPanel.Dock="Top" Margin="0,0,0,8" Padding="8">
         <StackPanel>
 
-          <!-- Site URL -->
-          <TextBlock Text="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[perm.site.url]}"
-                     Margin="0,0,0,2" />
-          <TextBox Text="{Binding SiteUrl, UpdateSourceTrigger=PropertyChanged}"
-                   Margin="0,0,0,6" />
-
-          <!-- View Sites + selected label -->
-          <TextBlock Text="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[perm.or.select]}"
-                     Margin="0,0,0,2" />
-          <Button Content="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[btn.view.sites]}"
-                  Command="{Binding OpenSitePickerCommand}"
-                  HorizontalAlignment="Left" Padding="8,2" Margin="0,0,0,4" />
-          <TextBlock Text="{Binding SitesSelectedLabel}"
-                     FontStyle="Italic" Foreground="Gray" Margin="0,0,0,8" />
-
           <!-- Checkboxes -->
           <CheckBox Content="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[chk.scan.folders]}"
                     IsChecked="{Binding ScanFolders}" Margin="0,0,0,4" />