docs(08-02): complete ViewModel Toggle Logic plan summary

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

.planning/phases/08-simplified-permissions/08-02-SUMMARY.md

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+---
+phase: 08-simplified-permissions
+plan: 02
+subsystem: viewmodel
+tags: [permissions, simplified-mode, toggle, viewmodel, observable]
+dependency_graph:
+  requires: [RiskLevel, PermissionLevelMapping, SimplifiedPermissionEntry, PermissionSummary, PermissionSummaryBuilder]
+  provides: [IsSimplifiedMode, IsDetailView, SimplifiedResults, Summaries, ActiveItemsSource]
+  affects: [08-03, 08-04]
+tech_stack:
+  added: []
+  patterns: [computed-property-from-cache, partial-method-change-handlers, mode-toggle-without-rescan]
+key_files:
+  created: []
+  modified:
+    - SharepointToolbox/ViewModels/Tabs/PermissionsViewModel.cs
+decisions:
+  - "ActiveItemsSource returns Results (raw) or SimplifiedResults depending on IsSimplifiedMode -- View binds to this single property"
+  - "RebuildSimplifiedData called on toggle-on and after scan completion, not eagerly on every Results mutation"
+  - "IsDetailView defaults to true so first toggle to simplified mode shows detailed rows"
+  - "OnTenantSwitched resets SimplifiedResults and Summaries to empty arrays for clean state"
+metrics:
+  duration: 84s
+  completed: 2026-04-07T12:10:22Z
+  tasks_completed: 1
+  tasks_total: 1
+  files_created: 0
+  files_modified: 1
+---
+
+# Phase 08 Plan 02: ViewModel Toggle Logic Summary
+
+IsSimplifiedMode and IsDetailView toggles on PermissionsViewModel with computed SimplifiedResults, Summaries, and ActiveItemsSource -- all mode switches rebuild from cached Results without re-scanning SharePoint.
+
+## Tasks Completed
+
+### Task 1: Add simplified mode properties and summary computation to PermissionsViewModel
+- **Commit:** e2c94bf
+- **Files:** SharepointToolbox/ViewModels/Tabs/PermissionsViewModel.cs
+- Added IsSimplifiedMode and IsDetailView observable properties with partial change handlers
+- Added SimplifiedResults (IReadOnlyList<SimplifiedPermissionEntry>) and Summaries (IReadOnlyList<PermissionSummary>) as manually-raised properties
+- Added ActiveItemsSource computed property returning correct collection for DataGrid binding
+- RebuildSimplifiedData() wraps Results via SimplifiedPermissionEntry.WrapAll and builds summaries
+- RunOperationAsync (both dispatcher and else branches) calls RebuildSimplifiedData when IsSimplifiedMode is active
+- OnTenantSwitched resets SimplifiedResults and Summaries to empty arrays
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Verification Results
+
+- dotnet build succeeded with 0 errors, 0 warnings
+- dotnet test PermissionsViewModelTests passed (1 passed, 0 failed, 0 skipped)
+- IsSimplifiedMode, IsDetailView, SimplifiedResults, Summaries, ActiveItemsSource all present
+- OnIsSimplifiedModeChanged calls RebuildSimplifiedData + raises ActiveItemsSource changed
+- RunOperationAsync calls RebuildSimplifiedData when IsSimplifiedMode is true (both branches)
+- OnTenantSwitched resets SimplifiedResults and Summaries
+
+## Self-Check: PASSED
+
+All modified files exist on disk. Task commit (e2c94bf) verified in git log. All 6 new members confirmed present in PermissionsViewModel.cs (26 occurrences across declarations, usages, and doc comments).