Add comprehensive WCAG 2.1 AA accessibility support

- Add VoiceOver labels and hints to all voting layouts, settings, widgets,
  onboarding screens, and entry cells
- Add Reduce Motion support to button animations throughout the app
- Ensure 44x44pt minimum touch targets on widget mood buttons
- Enhance AccessibilityHelpers with Dynamic Type support, ScaledValue wrapper,
  and VoiceOver detection utilities
- Gate premium features (Insights, Month/Year views) behind subscription
- Update widgets to show subscription prompts for non-subscribers

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Shared/Views/FeelsSubscriptionStoreView.swift

@@ -52,8 +52,8 @@ struct FeelsSubscriptionStoreView: View {
                 VStack(alignment: .leading, spacing: 12) {
                     FeatureHighlight(icon: "calendar", text: "Month & Year Views")
                     FeatureHighlight(icon: "lightbulb.fill", text: "AI-Powered Insights")
-                    FeatureHighlight(icon: "photo.fill", text: "Photos & Journal Notes")
-                    FeatureHighlight(icon: "heart.fill", text: "Health Data Correlation")
+                    FeatureHighlight(icon: "heart.text.square.fill", text: "Health Data Correlation")
+                    FeatureHighlight(icon: "square.grid.2x2.fill", text: "Interactive Widgets")
                 }
                 .padding(.top, 8)
             }