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/Views/CustomizeView/SubViews/ImagePackPickerView.swift

@@ -31,6 +31,7 @@ struct ImagePackPickerView: View {
                                         .foregroundColor(
                                             moodTint.color(forMood: mood)
                                         )
+                                        .accessibilityLabel(mood.strValue)
                                 }
                                 .frame(minWidth: 0, maxWidth: .infinity)
                             }