- Create AppTheme enum bundling color tint, icon pack, entry style, voting layout, paywall style, and lock screen style into unified themes
- Add AppThemePickerView for selecting themes with preview cards and detail sheets
- Extend PaywallStyle to 12 variants (celestial, garden, neon, minimal, zen, editorial, mixtape, heartfelt, luxe, forecast, playful, journal)
- Add LockScreenStyle enum with 13 variants including aurora default
- Create themed subscription paywalls with unique backgrounds, decorative elements, and typography for each style
- Create themed lock screens with unique backgrounds, central elements, and unlock buttons
- Update FeelsSubscriptionStoreView to read style from AppStorage so it auto-matches current theme
- Update PaywallPreviewSettingsView to support all 12 paywall styles
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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