docs(09-03): complete ViewModel chart properties and View XAML plan summary

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

.planning/REQUIREMENTS.md

@@ -25,7 +25,7 @@
 
 - [x] **VIZZ-01**: Storage Metrics tab includes a graph showing space by file type
 - [x] **VIZZ-02**: User can toggle between pie/donut chart and bar chart views
-- [ ] **VIZZ-03**: Graph updates automatically when storage scan completes
+- [x] **VIZZ-03**: Graph updates automatically when storage scan completes
 
 ## Future Requirements
 
@@ -54,7 +54,7 @@ None deferred — all active requirements scoped to v1.1.
 | SIMP-03 | Phase 8 | Complete |
 | VIZZ-01 | Phase 9 | Complete |
 | VIZZ-02 | Phase 9 | Complete |
-| VIZZ-03 | Phase 9 | Pending |
+| VIZZ-03 | Phase 9 | Complete |
 
 **Coverage:**
 - v1.1 requirements: 10 total

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: completed
-stopped_at: Completed 09-02-PLAN.md
+stopped_at: Completed 09-03-PLAN.md
-last_updated: "2026-04-07T13:25:16.593Z"
+last_updated: "2026-04-07T13:37:09.659Z"
-last_activity: 2026-04-07 — Completed 09-02 (CollectFileTypeMetricsAsync CamlQuery implementation)
+last_activity: 2026-04-07 — Completed 09-03 (ViewModel chart properties and View XAML)
 progress:
   total_phases: 4
   completed_phases: 3
   total_plans: 25
-  completed_plans: 23
+  completed_plans: 24
 ---
 
 # Project State
@@ -25,12 +25,12 @@ See: .planning/PROJECT.md (updated 2026-04-07)
 ## Current Position
 
 Phase: 9 — Storage Visualization
-Plan: 2 of 4
+Plan: 3 of 4
-Status: Plan 09-02 complete — CollectFileTypeMetricsAsync CamlQuery implementation
+Status: Plan 09-03 complete — ViewModel chart properties and View XAML
-Last activity: 2026-04-07 — Completed 09-02 (CollectFileTypeMetricsAsync CamlQuery implementation)
+Last activity: 2026-04-07 — Completed 09-03 (ViewModel chart properties and View XAML)
 
 ```
-v1.1 Progress: [█████████░] 92%
+v1.1 Progress: [██████████] 96%
 Phase 6 [x] → Phase 7 [x] → Phase 8 [x] → Phase 9 [~]
 ```
 
@@ -64,6 +64,7 @@ Phase 6 [x] → Phase 7 [x] → Phase 8 [x] → Phase 9 [~]
 | Phase 08 P06 | 2 | 2 tasks | 3 files |
 | Phase 09 P01 | 1 | 2 tasks | 3 files |
 | Phase 09 P02 | 1 | 1 tasks | 1 files |
+| Phase 09 P03 | 573 | 2 tasks | 5 files |
 
 ## Accumulated Context
 
@@ -112,6 +113,7 @@ Decisions are logged in PROJECT.md Key Decisions table.
 - [Phase 09-01]: FileTypeMetric record uses Extension (with dot), TotalSizeBytes (long), FileCount (int), DisplayLabel (computed) matching existing model patterns
 - [Phase 09-01]: CollectFileTypeMetricsAsync omits StorageScanOptions since file-type scan covers all non-hidden libraries without folder depth filtering
 - [Phase 09-02]: Added System.IO using explicitly -- WPF project implicit usings do not include System.IO for Path.GetExtension
+- [Phase 09]: Used wrapper Grid elements with MultiDataTrigger for LiveCharts2 chart visibility -- more reliable than styling third-party controls directly
 
 ### Pending Todos
 
@@ -123,6 +125,6 @@ None.
 
 ## Session Continuity
 
-Last session: 2026-04-07T13:25:16.591Z
+Last session: 2026-04-07T13:37:09.651Z
-Stopped at: Completed 09-02-PLAN.md
+Stopped at: Completed 09-03-PLAN.md
 Resume file: None

.planning/phases/09-storage-visualization/09-03-SUMMARY.md

@@ -0,0 +1,92 @@
+---
+phase: 09-storage-visualization
+plan: 03
+subsystem: storage-visualization
+tags: [viewmodel, xaml, charts, livecharts2, localization]
+dependency_graph:
+  requires: [09-01, 09-02]
+  provides: [chart-ui, chart-toggle, chart-data-binding]
+  affects: [StorageViewModel, StorageView]
+tech_stack:
+  added: [LiveChartsCore.SkiaSharpView.WPF chart controls in XAML]
+  patterns: [MultiDataTrigger visibility, ObservableCollection chart binding, top-10 aggregation]
+key_files:
+  created:
+    - SharepointToolbox/Views/Converters/BytesLabelConverter.cs
+  modified:
+    - SharepointToolbox/ViewModels/Tabs/StorageViewModel.cs
+    - SharepointToolbox/Views/Tabs/StorageView.xaml
+    - SharepointToolbox/Localization/Strings.resx
+    - SharepointToolbox/Localization/Strings.fr.resx
+decisions:
+  - "Used wrapper Grid elements with MultiDataTrigger for chart visibility instead of styling LiveCharts controls directly -- more reliable for third-party controls"
+  - "Removed ToolTipLabelFormatter from ColumnSeries (not available in LiveCharts2 rc5); DataLabelsFormatter provides size labels on bars"
+  - "Used XML entities for FR accented chars matching existing resx convention"
+metrics:
+  duration: 573s
+  completed: 2026-04-07
+---
+
+# Phase 09 Plan 03: ViewModel Chart Properties and View XAML Summary
+
+StorageViewModel extended with chart data binding (pie/donut + bar) using LiveCharts2, StorageView updated with split layout (DataGrid + chart panel), chart toggle radio buttons, and EN/FR localization keys.
+
+## What Was Done
+
+### Task 1: Extend StorageViewModel with chart data and toggle
+- Added LiveCharts2 using statements (LiveChartsCore, SkiaSharpView, SkiaSharp)
+- Added IsDonutChart toggle property (ObservableProperty, default true)
+- Added FileTypeMetrics ObservableCollection with property-changed notification
+- Added HasChartData computed property
+- Added PieChartSeries, BarChartSeries, BarXAxes, BarYAxes properties
+- Implemented UpdateChartSeries: top-10 by size with "Other" aggregation, PieSeries with configurable InnerRadius for donut mode, ColumnSeries with labeled axes
+- Added FormatBytes static helper for chart labels
+- Updated RunOperationAsync to call CollectFileTypeMetricsAsync after storage scan
+- Updated OnTenantSwitched to clear FileTypeMetrics
+- **Commit:** 70048dd
+
+### Task 2: Update StorageView.xaml with chart panel, toggle, and localization
+- Restructured StorageView.xaml: right content area now uses Grid with DataGrid (top), GridSplitter, chart panel (bottom)
+- Chart panel contains PieChart and CartesianChart wrapped in Grid elements with MultiDataTrigger visibility (IsDonutChart + HasChartData)
+- Added radio button group in left panel for donut/bar chart toggle
+- Added "no data" placeholder TextBlock with DataTrigger visibility
+- Created BytesLabelConverter for chart tooltip formatting
+- Added 5 stor.chart.* localization keys in Strings.resx (EN) and Strings.fr.resx (FR)
+- **Commit:** a8d79a8
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 1 - Bug] Removed ToolTipLabelFormatter from ColumnSeries**
+- **Found during:** Task 1
+- **Issue:** LiveCharts2 rc5 ColumnSeries does not have ToolTipLabelFormatter property (only PieSeries does)
+- **Fix:** Removed the property; DataLabelsFormatter still provides size labels on bar chart columns
+- **Files modified:** SharepointToolbox/ViewModels/Tabs/StorageViewModel.cs
+- **Commit:** 70048dd
+
+**2. [Rule 1 - Bug] Used wrapper Grid elements for chart visibility**
+- **Found during:** Task 2
+- **Issue:** Setting Style/Visibility directly on LiveCharts WPF controls may not work reliably with third-party controls
+- **Fix:** Wrapped each chart in a Grid element and applied MultiDataTrigger visibility on the wrapper instead
+- **Files modified:** SharepointToolbox/Views/Tabs/StorageView.xaml
+- **Commit:** a8d79a8
+
+**3. [Rule 1 - Bug] Used DataTrigger for no-data placeholder visibility**
+- **Found during:** Task 2
+- **Issue:** InverseBoolConverter only returns bool, not Visibility; cannot use it with ConverterParameter=Visibility
+- **Fix:** Used Style with DataTrigger binding on HasChartData instead of converter approach
+- **Files modified:** SharepointToolbox/Views/Tabs/StorageView.xaml
+- **Commit:** a8d79a8
+
+## Verification
+
+- `dotnet build SharepointToolbox/SharepointToolbox.csproj` succeeds with 0 errors
+- StorageViewModel has all required properties: IsDonutChart, FileTypeMetrics, PieChartSeries, BarChartSeries, BarXAxes, BarYAxes, HasChartData
+- RunOperationAsync calls CollectFileTypeMetricsAsync after CollectStorageAsync
+- StorageView.xaml contains lvc:PieChart and lvc:CartesianChart controls
+- Radio buttons bind to IsDonutChart with InverseBoolConverter for bar option
+- Strings.resx and Strings.fr.resx have stor.chart.title, stor.chart.donut, stor.chart.bar, stor.chart.toggle, stor.chart.nodata
+- No data placeholder shown via DataTrigger when HasChartData is False
+
+## Self-Check: PASSED