Add 3 interactive chart types: Compare, What If, Period vs Period (build 34)

- Compare (free): multi-source overlay chart, Base 100 / Return % / Value modes,
  chip selector, reactive to time range filter
- What If (premium): allocation simulator with sliders per source, dual-line chart
  actual vs simulated indexed to 100, orange warning when weights ≠ 100%
- Period vs Period (free): date-picker-driven comparison of any two custom periods,
  return % normalized from month 1 = 0%, color-coded legend with period labels

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

PortfolioJournal/Views/Charts/ChartsContainerView.swift

@@ -192,6 +192,10 @@ struct ChartsContainerView: View {
 
     private var hasAnyFilter: Bool {
         let chartType = viewModel.selectedChartType
+        // These chart types manage their own controls internally, no external filter bar needed
+        if chartType == .comparison || chartType == .simulator || chartType == .periodComparison {
+            return !viewModel.availableTimeRanges(for: chartType).isEmpty
+        }
         let hasTimeRange = chartType != .allocation && chartType != .riskReturn
         let hasCategories = !viewModel.availableCategories(for: chartType).isEmpty
         let hasSources = !viewModel.availableSources(for: chartType).isEmpty
@@ -498,6 +502,12 @@ struct ChartsContainerView: View {
                 )
             case .yearOverYear:
                 YearOverYearChartView(series: viewModel.yearOverYearData)
+            case .comparison:
+                ComparisonChartView(viewModel: viewModel)
+            case .simulator:
+                AllocationSimulatorView(viewModel: viewModel)
+            case .periodComparison:
+                PeriodComparisonChartView(viewModel: viewModel)
             }
         }
     }