Add 3 passing UI tests (batch 5): heatmap, reduce motion, high contrast

- TC-148: Year View heatmap grid renders with data (added accessibility ID)
- TC-143: App navigable with Reduce Motion enabled
- TC-144: App navigable with High Contrast mode enabled
- Marked 89 blocked tests RED in QA spreadsheet

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

Shared/Views/YearView/YearView.swift

@@ -609,6 +609,7 @@ struct YearCard: View, Equatable {
                 yearIndex: yearIndex,
                 demoManager: demoManager
             )
+            .accessibilityIdentifier(AccessibilityID.YearView.heatmap)
             .padding(.horizontal, 16)
             .padding(.bottom, 16)
         }