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/Onboarding/views/OnboardingTime.swift

@@ -63,6 +63,8 @@ struct OnboardingTime: View {
                         .datePickerStyle(.wheel)
                         .labelsHidden()
                         .colorScheme(.light)
+                        .accessibilityLabel(String(localized: "Reminder time"))
+                        .accessibilityHint(String(localized: "Select when you want to be reminded"))
                 }
                 .padding(.vertical, 20)
                 .padding(.horizontal, 24)
@@ -80,6 +82,7 @@ struct OnboardingTime: View {
                     Image(systemName: "info.circle.fill")
                         .font(.system(size: 20))
                         .foregroundColor(.white.opacity(0.8))
+                        .accessibilityHidden(true)
 
                     Text("You'll get a gentle reminder at \(formatter.string(from: onboardingData.date)) every day")
                         .font(.system(size: 14, weight: .medium))
@@ -87,6 +90,7 @@ struct OnboardingTime: View {
                 }
                 .padding(.horizontal, 30)
                 .padding(.bottom, 80)
+                .accessibilityElement(children: .combine)
             }
         }
     }