Share cards 2.0: dark panorama + privacidad + Story + atribución (build 82) #34

Rediseño de las cards de compartir con el sistema visual de las screenshots
ASO: fondo navy con glows y grid, sparkline de evolución con gradiente
azul→cian y punto final, chip de delta, footer con marca + QR. Aplica a
Portfolio Snapshot, Monthly Check-in y Monthly Summary.

Potencia referral: sheet de opciones previo con preview en vivo
(PortfolioShareOptionsView) — toggle «Solo porcentajes» (sin importes
absolutos, la fricción #1 para compartir) y formato Post/Story 9:16. QR y
link con ?ct=snapshot_share para atribución en App Analytics. Analytics:
share type portfolio_value_percent. L10n ×7.

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

PortfolioJournal/Services/ShareService.swift

@@ -6,8 +6,55 @@ import LinkPresentation
 class ShareService {
     static let shared = ShareService()
 
+    /// Attributed App Store link for shared cards (ct= shows up in App
+    /// Analytics as a campaign, so referral installs become measurable).
+    static let snapshotShareURL = URL(string: "https://apps.apple.com/app/portfolio-journal-tracker/id6757678318?ct=snapshot_share")!
+
     private init() {}
 
+    /// Extracts the "(±X.XX%)" part of a combined "±1.234 € (±X.XX%)" string.
+    static func percentPart(_ s: String?) -> String? {
+        guard let s else { return nil }
+        guard let open = s.lastIndex(of: "("), let close = s.lastIndex(of: ")"), open < close else {
+            return s
+        }
+        return String(s[s.index(after: open)..<close])
+    }
+
+    struct PortfolioCardStrings {
+        let totalValue: String
+        let changeText: String
+        let yearChange: String?
+        let sinceInceptionChange: String?
+    }
+
+    /// Privacy transform: with `percentOnly` the card leads with the all-time
+    /// return and every row drops absolute amounts. Nobody shares their net
+    /// worth in euros; everybody shares +42%.
+    static func portfolioCardStrings(
+        totalValue: String,
+        changeText: String,
+        yearChange: String?,
+        sinceInceptionChange: String?,
+        percentOnly: Bool
+    ) -> PortfolioCardStrings {
+        guard percentOnly else {
+            return PortfolioCardStrings(
+                totalValue: totalValue, changeText: changeText,
+                yearChange: yearChange, sinceInceptionChange: sinceInceptionChange
+            )
+        }
+        let heroPercent = percentPart(sinceInceptionChange)
+            ?? percentPart(changeText)
+            ?? totalValue
+        return PortfolioCardStrings(
+            totalValue: heroPercent,
+            changeText: percentPart(changeText) ?? changeText,
+            yearChange: percentPart(yearChange),
+            sinceInceptionChange: percentPart(sinceInceptionChange)
+        )
+    }
+
     static func buildMonthlyCheckInShareText(summary: MonthlySummary, appName: String) -> String {
         """
         \(summary.periodLabel) Check-in
@@ -118,31 +165,47 @@ class ShareService {
         changeText: String,
         changeLabel: String,
         yearChange: String?,
-        sinceInceptionChange: String?
+        sinceInceptionChange: String?,
+        sparkline: [Double] = [],
+        isPositive: Bool = true,
+        percentOnly: Bool = false,
+        storyFormat: Bool = false
     ) {
-        FirebaseService.shared.logShare(type: "portfolio_value")
+        FirebaseService.shared.logShare(type: percentOnly ? "portfolio_value_percent" : "portfolio_value")
         let appName = Self.appDisplayName
-        let text = Self.buildPortfolioValueShareText(
+        let display = Self.portfolioCardStrings(
             totalValue: totalValue,
             changeText: changeText,
-            changeLabel: changeLabel,
             yearChange: yearChange,
             sinceInceptionChange: sinceInceptionChange,
+            percentOnly: percentOnly
+        )
+        // Fallback text honors the privacy choice too.
+        let text = Self.buildPortfolioValueShareText(
+            totalValue: display.totalValue,
+            changeText: display.changeText,
+            changeLabel: changeLabel,
+            yearChange: display.yearChange,
+            sinceInceptionChange: display.sinceInceptionChange,
             appName: appName
         )
 
         shareCard(
             cardTitle: "Portfolio Snapshot",
-            fallbackText: text
+            fallbackText: text,
+            shareURL: Self.snapshotShareURL
         ) {
             PortfolioValueShareCardView(
-                totalValue: totalValue,
-                changeText: changeText,
+                totalValue: display.totalValue,
+                changeText: display.changeText,
                 changeLabel: changeLabel,
-                yearChange: yearChange,
-                sinceInceptionChange: sinceInceptionChange,
+                yearChange: display.yearChange,
+                sinceInceptionChange: display.sinceInceptionChange,
                 appName: appName,
-                qrCodeImage: GoalShareService.generateQRCode(for: GoalShareService.appStoreURL, size: 200)
+                qrCodeImage: GoalShareService.generateQRCode(for: Self.snapshotShareURL, size: 200),
+                sparkline: sparkline,
+                isPositive: isPositive,
+                storyFormat: storyFormat
             )
         }
     }
@@ -174,10 +237,10 @@ class ShareService {
     private func shareCard<Content: View>(
         cardTitle: String,
         fallbackText: String,
+        shareURL: URL = GoalShareService.appStoreURL,
         @ViewBuilder card: () -> Content
     ) {
         guard let viewController = ShareService.topViewController() else { return }
-        let shareURL = GoalShareService.appStoreURL
 
         if #available(iOS 16.0, *) {
             let renderer = ImageRenderer(content: card())