Initial commit: Conjuga Spanish conjugation app

Includes SwiftData dual-store architecture (local reference + CloudKit user data),
JSON-based data seeding, 20 tense guides, 20 grammar notes, SRS review system,
course vocabulary, and widget support.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Conjuga/SharedModels/Sources/SharedModels/CourseCardStore.swift

@@ -0,0 +1,75 @@
+import CryptoKit
+import Foundation
+import SwiftData
+
+public enum CourseCardStore {
+    private static var sortDescriptors: [SortDescriptor<VocabCard>] {
+        [
+            SortDescriptor(\VocabCard.deckId),
+            SortDescriptor(\VocabCard.front),
+            SortDescriptor(\VocabCard.back),
+        ]
+    }
+
+    public static func reviewKey(for card: VocabCard) -> String {
+        reviewKey(
+            deckId: card.deckId,
+            front: card.front,
+            back: card.back,
+            examplesES: card.examplesES,
+            examplesEN: card.examplesEN
+        )
+    }
+
+    public static func reviewKey(
+        deckId: String,
+        front: String,
+        back: String,
+        examplesES: [String],
+        examplesEN: [String]
+    ) -> String {
+        let source = [
+            deckId,
+            front,
+            back,
+            examplesES.joined(separator: "\u{1F}"),
+            examplesEN.joined(separator: "\u{1F}"),
+        ].joined(separator: "\u{1E}")
+
+        let digest = SHA256.hash(data: Data(source.utf8))
+        return digest.map { String(format: "%02x", $0) }.joined()
+    }
+
+    public static func fetchCardCount(context: ModelContext) -> Int {
+        (try? context.fetchCount(FetchDescriptor<VocabCard>())) ?? 0
+    }
+
+    public static func fetchCard(at index: Int, context: ModelContext) -> VocabCard? {
+        guard index >= 0 else { return nil }
+        var descriptor = FetchDescriptor<VocabCard>(sortBy: sortDescriptors)
+        descriptor.fetchOffset = index
+        descriptor.fetchLimit = 1
+        return (try? context.fetch(descriptor))?.first
+    }
+
+    public static func fetchCards(offset: Int, limit: Int, context: ModelContext) -> [VocabCard] {
+        guard limit > 0 else { return [] }
+        var descriptor = FetchDescriptor<VocabCard>(sortBy: sortDescriptors)
+        descriptor.fetchOffset = max(offset, 0)
+        descriptor.fetchLimit = limit
+        return (try? context.fetch(descriptor)) ?? []
+    }
+
+    public static func fetchWordOfDayCard(
+        for date: Date,
+        wordOffset: Int,
+        context: ModelContext
+    ) -> VocabCard? {
+        let count = fetchCardCount(context: context)
+        guard count > 0 else { return nil }
+
+        let dayOfYear = Calendar.current.ordinality(of: .day, in: .year, for: date) ?? 1
+        let index = (dayOfYear + wordOffset) % count
+        return fetchCard(at: index, context: context)
+    }
+}

Conjuga/SharedModels/Sources/SharedModels/CourseDeck.swift

@@ -0,0 +1,24 @@
+import SwiftData
+import Foundation
+
+@Model
+public final class CourseDeck {
+    public var id: String = ""
+    public var weekNumber: Int = 0
+    public var title: String = ""
+    public var cardCount: Int = 0
+    public var courseName: String = ""
+    public var isReversed: Bool = false
+
+    @Relationship(deleteRule: .cascade, inverse: \VocabCard.deck)
+    public var cards: [VocabCard]?
+
+    public init(id: String, weekNumber: Int, title: String, cardCount: Int, courseName: String, isReversed: Bool) {
+        self.id = id
+        self.weekNumber = weekNumber
+        self.title = title
+        self.cardCount = cardCount
+        self.courseName = courseName
+        self.isReversed = isReversed
+    }
+}

Conjuga/SharedModels/Sources/SharedModels/VocabCard.swift

@@ -0,0 +1,28 @@
+import SwiftData
+import Foundation
+
+@Model
+public final class VocabCard {
+    public var front: String = ""
+    public var back: String = ""
+    public var deckId: String = ""
+    public var examplesES: [String] = []
+    public var examplesEN: [String] = []
+
+    public var deck: CourseDeck?
+
+    // Legacy SRS fields retained only so old local progress can be migrated to CourseReviewCard.
+    public var easeFactor: Double = 2.5
+    public var interval: Int = 0
+    public var repetitions: Int = 0
+    public var dueDate: Date = Date()
+    public var lastReviewDate: Date?
+
+    public init(front: String, back: String, deckId: String, examplesES: [String] = [], examplesEN: [String] = []) {
+        self.front = front
+        self.back = back
+        self.deckId = deckId
+        self.examplesES = examplesES
+        self.examplesEN = examplesEN
+    }
+}

Conjuga/SharedModels/Sources/SharedModels/WidgetSnapshot.swift

@@ -0,0 +1,64 @@
+import Foundation
+
+public struct WordOfDay: Codable, Equatable, Sendable {
+    public var spanish: String
+    public var english: String
+    public var weekNumber: Int
+
+    public init(spanish: String, english: String, weekNumber: Int) {
+        self.spanish = spanish
+        self.english = english
+        self.weekNumber = weekNumber
+    }
+}
+
+public struct WidgetData: Codable, Equatable, Sendable {
+    public var todayCount: Int
+    public var dailyGoal: Int
+    public var currentStreak: Int
+    public var dueCardCount: Int
+    public var wordOfTheDay: WordOfDay?
+    public var latestTestScore: Int?
+    public var latestTestWeek: Int?
+    public var currentWeek: Int
+    public var lastUpdated: Date
+
+    public init(
+        todayCount: Int,
+        dailyGoal: Int,
+        currentStreak: Int,
+        dueCardCount: Int,
+        wordOfTheDay: WordOfDay?,
+        latestTestScore: Int?,
+        latestTestWeek: Int?,
+        currentWeek: Int,
+        lastUpdated: Date
+    ) {
+        self.todayCount = todayCount
+        self.dailyGoal = dailyGoal
+        self.currentStreak = currentStreak
+        self.dueCardCount = dueCardCount
+        self.wordOfTheDay = wordOfTheDay
+        self.latestTestScore = latestTestScore
+        self.latestTestWeek = latestTestWeek
+        self.currentWeek = currentWeek
+        self.lastUpdated = lastUpdated
+    }
+
+    public static let placeholder = WidgetData(
+        todayCount: 12,
+        dailyGoal: 50,
+        currentStreak: 3,
+        dueCardCount: 8,
+        wordOfTheDay: WordOfDay(spanish: "hablar", english: "to speak", weekNumber: 1),
+        latestTestScore: 85,
+        latestTestWeek: 2,
+        currentWeek: 2,
+        lastUpdated: Date()
+    )
+
+    public var progressPercent: Double {
+        guard dailyGoal > 0 else { return 0 }
+        return min(Double(todayCount) / Double(dailyGoal), 1.0)
+    }
+}