Share cards compartibles: brand header grande, fecha, Dark/Light (build 83) #35

- Header de marca arriba, grande (logo BrandMark 48px + nombre title2 rounded),
  nunca se corta en Story (9:16 real 360x640, Post 4:5 360x450).
- Héroe = retorno % (privacy/branding-friendly), valor como apoyo.
- Fecha del último check-in bajo el nombre (share_as_of) para dar contexto a
  quien no conoce la app; DashboardViewModel.shareAsOfDate.
- Tema Dark + Light (ShareCardTheme) con selector en el sheet + preview vivo.
- Sparkline real (viewModel.evolutionData), ya se pasaba.
- CTA de descarga + QR con ct=snapshot_share (atribución App Analytics).
- L10n x7 (as_of, theme_dark/light, cta, hero, metrics).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L38583J7AYWCVPevkivscj

PortfolioJournal/Resources/it.lproj/Localizable.strings

@@ -660,3 +660,15 @@
 "share_format_post" = "Post";
 "share_format_story" = "Storia";
 "share_card_cta" = "Condividi";
+
+// Share cards 2.1 — brand header + download CTA (1.6.0)
+"share_hero_eyebrow" = "Rendimento totale";
+"share_metric_yoy" = "Quest'anno";
+"share_metric_since_inception" = "Dall'inizio";
+"share_cta_headline" = "Monitora il tuo — gratis";
+"share_cta_sub" = "Scansiona per Portfolio Journal";
+
+// Share cards 2.2 — as-of date + theme (1.6.0)
+"share_as_of" = "Al %@";
+"share_theme_dark" = "Scuro";
+"share_theme_light" = "Chiaro";