feat: Add optional in-app tip jar

App/Shared/Resources/de.lproj/Localizable.strings

@@ -111,3 +111,13 @@
 "No data" = "Keine Daten";
 "No weight yet" = "Noch kein Gewicht";
 "No weight" = "Kein Gewicht";
+
+"Support" = "Support";
+"Support LogWeight" = "LogWeight unterstützen";
+"LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way." = "LogWeight ist kostenlos, ohne Werbung und ohne Tracking. Wenn es dir nützlich ist, hilft ein Trinkgeld, das so zu halten.";
+"Thank you for supporting LogWeight!" = "Danke, dass du LogWeight unterstützt!";
+"The purchase didn't go through. Please try again." = "Der Kauf ist fehlgeschlagen. Bitte versuche es erneut.";
+"Enjoying LogWeight?" = "Gefällt dir LogWeight?";
+"It's free, with no ads and no tracking. If it's been useful, a small tip helps keep it that way." = "Es ist kostenlos, ohne Werbung und ohne Tracking. Wenn es dir nützlich war, hilft ein kleines Trinkgeld, das so zu halten.";
+"Leave a tip" = "Trinkgeld geben";
+"Maybe later" = "Vielleicht später";

App/Shared/Resources/en.lproj/Localizable.strings

@@ -111,3 +111,13 @@
 "No data" = "No data";
 "No weight yet" = "No weight yet";
 "No weight" = "No weight";
+
+"Support" = "Support";
+"Support LogWeight" = "Support LogWeight";
+"LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way." = "LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way.";
+"Thank you for supporting LogWeight!" = "Thank you for supporting LogWeight!";
+"The purchase didn't go through. Please try again." = "The purchase didn't go through. Please try again.";
+"Enjoying LogWeight?" = "Enjoying LogWeight?";
+"It's free, with no ads and no tracking. If it's been useful, a small tip helps keep it that way." = "It's free, with no ads and no tracking. If it's been useful, a small tip helps keep it that way.";
+"Leave a tip" = "Leave a tip";
+"Maybe later" = "Maybe later";

App/Shared/Resources/es.lproj/Localizable.strings

@@ -111,3 +111,13 @@
 "No data" = "Sin datos";
 "No weight yet" = "Aún no hay peso";
 "No weight" = "Sin peso";
+
+"Support" = "Apoyo";
+"Support LogWeight" = "Apoyar a LogWeight";
+"LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way." = "LogWeight es gratis, sin anuncios ni seguimiento. Si te resulta útil, una propina ayuda a que siga siendo así.";
+"Thank you for supporting LogWeight!" = "¡Gracias por apoyar a LogWeight!";
+"The purchase didn't go through. Please try again." = "La compra no se pudo completar. Inténtalo de nuevo.";
+"Enjoying LogWeight?" = "¿Te gusta LogWeight?";
+"It's free, with no ads and no tracking. If it's been useful, a small tip helps keep it that way." = "Es gratis, sin anuncios ni seguimiento. Si te ha resultado útil, una pequeña propina ayuda a que siga siendo así.";
+"Leave a tip" = "Dejar una propina";
+"Maybe later" = "Quizá más tarde";

App/Shared/Resources/fr.lproj/Localizable.strings

@@ -111,3 +111,13 @@
 "No data" = "Aucune donnée";
 "No weight yet" = "Aucun poids pour le moment";
 "No weight" = "Aucun poids";
+
+"Support" = "Soutien";
+"Support LogWeight" = "Soutenir LogWeight";
+"LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way." = "LogWeight est gratuit, sans publicité ni suivi. Si l’application vous est utile, un pourboire aide à le rester.";
+"Thank you for supporting LogWeight!" = "Merci de soutenir LogWeight !";
+"The purchase didn't go through. Please try again." = "L’achat n’a pas abouti. Veuillez réessayer.";
+"Enjoying LogWeight?" = "LogWeight vous plaît ?";
+"It's free, with no ads and no tracking. If it's been useful, a small tip helps keep it that way." = "L’application est gratuite, sans publicité ni suivi. Si elle vous a été utile, un petit pourboire aide à le rester.";
+"Leave a tip" = "Laisser un pourboire";
+"Maybe later" = "Plus tard";

App/Shared/Resources/it.lproj/Localizable.strings

@@ -111,3 +111,13 @@
 "No data" = "Nessun dato";
 "No weight yet" = "Nessun peso ancora";
 "No weight" = "Nessun peso";
+
+"Support" = "Supporto";
+"Support LogWeight" = "Sostieni LogWeight";
+"LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way." = "LogWeight è gratuita, senza pubblicità né tracciamento. Se ti è utile, una mancia aiuta a mantenerla così.";
+"Thank you for supporting LogWeight!" = "Grazie per aver sostenuto LogWeight!";
+"The purchase didn't go through. Please try again." = "L’acquisto non è andato a buon fine. Riprova.";
+"Enjoying LogWeight?" = "Ti piace LogWeight?";
+"It's free, with no ads and no tracking. If it's been useful, a small tip helps keep it that way." = "È gratuita, senza pubblicità né tracciamento. Se ti è stata utile, una piccola mancia aiuta a mantenerla così.";
+"Leave a tip" = "Lascia una mancia";
+"Maybe later" = "Forse più tardi";

App/Shared/Resources/ja.lproj/Localizable.strings

@@ -111,3 +111,13 @@
 "No data" = "データなし";
 "No weight yet" = "まだ体重がありません";
 "No weight" = "体重なし";
+
+"Support" = "サポート";
+"Support LogWeight" = "LogWeightをサポート";
+"LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way." = "LogWeightは無料で、広告もトラッキングもありません。役立っていると感じたら、チップがその継続を支えます。";
+"Thank you for supporting LogWeight!" = "LogWeightを応援していただきありがとうございます！";
+"The purchase didn't go through. Please try again." = "購入を完了できませんでした。もう一度お試しください。";
+"Enjoying LogWeight?" = "LogWeightは気に入っていますか？";
+"It's free, with no ads and no tracking. If it's been useful, a small tip helps keep it that way." = "無料で、広告もトラッキングもありません。役立っていたら、少額のチップがその継続を支えます。";
+"Leave a tip" = "チップを送る";
+"Maybe later" = "また今度";

App/Shared/Resources/ko.lproj/Localizable.strings

@@ -111,3 +111,13 @@
 "No data" = "데이터 없음";
 "No weight yet" = "아직 체중 없음";
 "No weight" = "체중 없음";
+
+"Support" = "지원";
+"Support LogWeight" = "LogWeight 후원";
+"LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way." = "LogWeight는 광고와 추적 없이 무료로 제공됩니다. 유용하셨다면 팁이 이를 유지하는 데 도움이 됩니다.";
+"Thank you for supporting LogWeight!" = "LogWeight를 후원해 주셔서 감사합니다!";
+"The purchase didn't go through. Please try again." = "구매가 완료되지 않았습니다. 다시 시도해 주세요.";
+"Enjoying LogWeight?" = "LogWeight를 잘 사용하고 계신가요?";
+"It's free, with no ads and no tracking. If it's been useful, a small tip helps keep it that way." = "광고와 추적 없이 무료로 제공됩니다. 유용하셨다면 소액의 팁이 이를 유지하는 데 도움이 됩니다.";
+"Leave a tip" = "팁 남기기";
+"Maybe later" = "나중에";

App/Shared/Resources/nl.lproj/Localizable.strings

@@ -111,3 +111,13 @@
 "No data" = "Geen gegevens";
 "No weight yet" = "Nog geen gewicht";
 "No weight" = "Geen gewicht";
+
+"Support" = "Ondersteuning";
+"Support LogWeight" = "LogWeight ondersteunen";
+"LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way." = "LogWeight is gratis, zonder advertenties en zonder tracking. Als het nuttig voor je is, helpt een fooi om dat zo te houden.";
+"Thank you for supporting LogWeight!" = "Bedankt voor je steun aan LogWeight!";
+"The purchase didn't go through. Please try again." = "De aankoop is niet gelukt. Probeer het opnieuw.";
+"Enjoying LogWeight?" = "Bevalt LogWeight je?";
+"It's free, with no ads and no tracking. If it's been useful, a small tip helps keep it that way." = "Het is gratis, zonder advertenties en zonder tracking. Als het nuttig was, helpt een kleine fooi om dat zo te houden.";
+"Leave a tip" = "Een fooi geven";
+"Maybe later" = "Misschien later";

App/Shared/Resources/pt-BR.lproj/Localizable.strings

@@ -111,3 +111,13 @@
 "No data" = "Sem dados";
 "No weight yet" = "Ainda sem peso";
 "No weight" = "Sem peso";
+
+"Support" = "Apoio";
+"Support LogWeight" = "Apoiar o LogWeight";
+"LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way." = "O LogWeight é gratuito, sem anúncios e sem rastreamento. Se ele é útil para você, uma gorjeta ajuda a manter assim.";
+"Thank you for supporting LogWeight!" = "Obrigado por apoiar o LogWeight!";
+"The purchase didn't go through. Please try again." = "A compra não foi concluída. Tente novamente.";
+"Enjoying LogWeight?" = "Está gostando do LogWeight?";
+"It's free, with no ads and no tracking. If it's been useful, a small tip helps keep it that way." = "É gratuito, sem anúncios e sem rastreamento. Se tem sido útil, uma pequena gorjeta ajuda a manter assim.";
+"Leave a tip" = "Deixar uma gorjeta";
+"Maybe later" = "Talvez depois";

App/Shared/Resources/zh-Hans.lproj/Localizable.strings

@@ -111,3 +111,13 @@
 "No data" = "无数据";
 "No weight yet" = "尚无体重";
 "No weight" = "无体重";
+
+"Support" = "支持";
+"Support LogWeight" = "支持 LogWeight";
+"LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way." = "LogWeight 免费提供，没有广告也没有追踪。如果它对你有帮助，赞赏有助于保持这样。";
+"Thank you for supporting LogWeight!" = "感谢你支持 LogWeight！";
+"The purchase didn't go through. Please try again." = "购买未完成，请重试。";
+"Enjoying LogWeight?" = "喜欢 LogWeight 吗？";
+"It's free, with no ads and no tracking. If it's been useful, a small tip helps keep it that way." = "它是免费的，没有广告也没有追踪。如果对你有帮助，一点小赞赏有助于保持这样。";
+"Leave a tip" = "赞赏一下";
+"Maybe later" = "以后再说";

App/Shared/Resources/zh-Hant.lproj/Localizable.strings

@@ -111,3 +111,13 @@
 "No data" = "沒有資料";
 "No weight yet" = "尚無體重";
 "No weight" = "沒有體重";
+
+"Support" = "支援";
+"Support LogWeight" = "支援 LogWeight";
+"LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way." = "LogWeight 免費提供，沒有廣告也沒有追蹤。如果它對你有幫助，贊賞有助於保持這樣。";
+"Thank you for supporting LogWeight!" = "感謝你支援 LogWeight！";
+"The purchase didn't go through. Please try again." = "購買未完成，請再試一次。";
+"Enjoying LogWeight?" = "喜歡 LogWeight 嗎？";
+"It's free, with no ads and no tracking. If it's been useful, a small tip helps keep it that way." = "它是免費的，沒有廣告也沒有追蹤。如果對你有幫助，一點小贊賞有助於保持這樣。";
+"Leave a tip" = "贊賞一下";
+"Maybe later" = "以後再說";

App/Shared/Views/SettingsView.swift

@@ -80,6 +80,17 @@ struct SettingsView: View {
                 }
 #endif
 
+#if os(iOS)
+                Section("Support") {
+                    NavigationLink {
+                        TipJarView()
+                    } label: {
+                        Label("Support LogWeight", systemImage: "heart")
+                    }
+                    .accessibilityIdentifier("settings.tipjar")
+                }
+#endif
+
                 Section("Apple Health") {
                     Link(destination: URL(string: "x-apple-health://")!) {
                         Label("Open Apple Health", systemImage: "heart.text.square")

App/iOS/LogWeightApp.swift

@@ -20,6 +20,7 @@ struct LogWeightApp: App {
     private static let preparingHintDelay: Duration = .seconds(1.4)
 
     init() {
+        Self.resetUserDefaultsForUITestIfNeeded()
         SettingsMigrator.migrateIfNeeded()
         let store = Self.makeStore()
         self.healthKitStore = store
@@ -90,6 +91,20 @@ struct LogWeightApp: App {
         return InMemoryHealthKitStore(samples: fixtureSamples)
     }
 
+    /// UI tests run in the same simulator app container across launches (and, on a
+    /// persistent CI runner, across separate CI jobs). `--use-in-memory-store` already
+    /// isolates HealthKit; without this, `logweight_*` UserDefaults keys — notably the
+    /// tip-jar `successfulEntryCount` counter — keep accumulating and can cross
+    /// `TipPromptCoordinator.promptThreshold`, popping the tip sheet mid-test and
+    /// breaking assertions that don't expect it.
+    private static func resetUserDefaultsForUITestIfNeeded() {
+        guard CommandLine.arguments.contains("--use-in-memory-store") else { return }
+        let defaults = UserDefaults.standard
+        for (key, _) in defaults.dictionaryRepresentation() where key.hasPrefix("logweight_") {
+            defaults.removeObject(forKey: key)
+        }
+    }
+
     private static func parseSeedFixture(from arguments: [String]) -> ScreenshotFixture? {
         let prefix = "--seed="
         guard let raw = arguments.first(where: { $0.hasPrefix(prefix) })?.dropFirst(prefix.count) else {

App/iOS/Support/TipJarStore.swift

@@ -0,0 +1,75 @@
+import Observation
+import StoreKit
+import LogWeightCore
+
+/// Loads tip-jar products and drives purchases via StoreKit 2.
+///
+/// Tips are consumables: a successful purchase has nothing to unlock or
+/// restore, so there is no entitlement to track beyond `purchaseState` for
+/// the confirmation UI. No server round-trip, no receipt validation needed.
+@Observable
+@MainActor
+final class TipJarStore {
+
+    enum PurchaseState: Equatable {
+        case idle
+        case purchasing(TipJarProduct)
+        case thankYou(TipJarProduct)
+        case failed
+    }
+
+    private(set) var products: [Product] = []
+    private(set) var purchaseState: PurchaseState = .idle
+    @ObservationIgnored
+    private nonisolated(unsafe) var transactionListener: Task<Void, Never>?
+
+    init() {
+        transactionListener = Task { [weak self] in
+            for await result in Transaction.updates {
+                await self?.handle(result)
+            }
+        }
+    }
+
+    deinit {
+        transactionListener?.cancel()
+    }
+
+    func loadProducts() async {
+        do {
+            let identifiers = TipJarProduct.allCases.map(\.rawValue)
+            products = try await Product.products(for: identifiers)
+                .sorted { $0.price < $1.price }
+        } catch {
+            products = []
+        }
+    }
+
+    func purchase(_ product: Product) async {
+        guard let tip = TipJarProduct(rawValue: product.id) else { return }
+        purchaseState = .purchasing(tip)
+        do {
+            switch try await product.purchase() {
+            case .success(.verified(let transaction)):
+                await transaction.finish()
+                purchaseState = .thankYou(tip)
+            case .success(.unverified):
+                purchaseState = .failed
+            case .userCancelled, .pending:
+                purchaseState = .idle
+            @unknown default:
+                purchaseState = .idle
+            }
+        } catch {
+            purchaseState = .failed
+        }
+    }
+
+    private func handle(_ result: VerificationResult<Transaction>) async {
+        guard case .verified(let transaction) = result else { return }
+        await transaction.finish()
+        if let tip = TipJarProduct(rawValue: transaction.productID) {
+            purchaseState = .thankYou(tip)
+        }
+    }
+}

App/iOS/Views/EntryView.swift

@@ -20,6 +20,9 @@ struct EntryView: View {
     @AppStorage(SettingsKey.hapticsEnabled) private var hapticsEnabled: Bool = true
 
     @State private var showSettings = false
+    @State private var showTipPrompt = false
+    @State private var showTipJar = false
+    @State private var pendingOpenTipJar = false
     @State private var isEditingValue = false
     @State private var typedValue: String = ""
     @State private var clearSavedStatusTask: Task<Void, Never>?
@@ -110,6 +113,17 @@ struct EntryView: View {
             .sheet(isPresented: $showSettings) {
                 SettingsView()
             }
+            .sheet(isPresented: $showTipPrompt, onDismiss: {
+                if pendingOpenTipJar {
+                    pendingOpenTipJar = false
+                    showTipJar = true
+                }
+            }) {
+                TipPromptSheet(onOpenTipJar: { pendingOpenTipJar = true })
+            }
+            .sheet(isPresented: $showTipJar) {
+                NavigationStack { TipJarView() }
+            }
             .sensoryFeedback(.success, trigger: state.saveStatus) { _, new in
                 if hapticsEnabled, case .savedAt = new { return true }
                 return false
@@ -264,6 +278,10 @@ struct EntryView: View {
                 await state.commit(store: store)
                 if case .savedAt = state.saveStatus {
                     syncWidgetAfterSuccessfulSave()
+                    if TipPromptCoordinator.recordSuccessfulEntry() {
+                        TipPromptCoordinator.markPresented()
+                        showTipPrompt = true
+                    }
                 }
             }
         } label: {

App/iOS/Views/TipJarView.swift

@@ -0,0 +1,72 @@
+import SwiftUI
+import StoreKit
+import LogWeightCore
+
+/// "Support LogWeight" screen: lists consumable tip tiers.
+///
+/// No paywall, no nagging — reachable only from Settings, or from the
+/// one-time `TipPromptSheet` shown after `TipPromptCoordinator.promptThreshold`
+/// successful entries.
+struct TipJarView: View {
+    @State private var store = TipJarStore()
+
+    var body: some View {
+        List {
+            Section {
+                ForEach(store.products, id: \.id) { product in
+                    Button {
+                        Task { await store.purchase(product) }
+                    } label: {
+                        HStack {
+                            Label(product.displayName, systemImage: symbol(for: product))
+                            Spacer()
+                            Text(product.displayPrice)
+                                .foregroundStyle(.secondary)
+                        }
+                    }
+                    .disabled(isPurchasing)
+                    .accessibilityIdentifier("tipjar.product.\(product.id)")
+                }
+
+                Text("LogWeight is free, with no ads and no tracking. If it's useful to you, a tip helps keep it that way.")
+                    .font(.footnote)
+                    .foregroundStyle(.secondary)
+            }
+
+            if case .thankYou = store.purchaseState {
+                Section {
+                    Label("Thank you for supporting LogWeight!", systemImage: "heart.fill")
+                        .foregroundStyle(.pink)
+                        .accessibilityIdentifier("tipjar.thankyou")
+                }
+            }
+
+            if case .failed = store.purchaseState {
+                Section {
+                    Text("The purchase didn't go through. Please try again.")
+                        .foregroundStyle(.red)
+                }
+            }
+        }
+        .navigationTitle("Support LogWeight")
+        .navigationBarTitleDisplayMode(.inline)
+        .task {
+            await store.loadProducts()
+        }
+    }
+
+    private var isPurchasing: Bool {
+        if case .purchasing = store.purchaseState { return true }
+        return false
+    }
+
+    private func symbol(for product: Product) -> String {
+        TipJarProduct(rawValue: product.id)?.sfSymbol ?? "heart"
+    }
+}
+
+#if DEBUG
+#Preview {
+    NavigationStack { TipJarView() }
+}
+#endif