Fix widget layout clipping and add comprehensive widget previews

- Fix LargeVotingView mood icons getting clipped at edges by using
  flexible HStack spacing with maxWidth: .infinity
- Fix VotingView medium layout with smaller icons and even distribution
- Add comprehensive #Preview macros for all widget states:
  - Vote widget: small/medium, voted/not voted, all mood states
  - Timeline widget: small/medium/large with various data states
- Reduce icon sizes and padding to fit within widget bounds
- Update accessibility labels and hints across views

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

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

Shared/Onboarding/views/OnboardingCustomizeTwo.swift

@@ -25,6 +25,7 @@ struct OnboardingCustomizeTwo: View {
                         .foregroundColor(Color(UIColor.darkText))
                         .opacity(0.04)
                         .scaleEffect(1.2, anchor: .trailing)
+                        .accessibilityHidden(true)
                     Spacer()
                 }