Workout: per-day history + log KC-8/KC-9

- Add per-day workout history: WorkoutDayLog/LoggedExercise/LoggedSet
  models stored at kisani.workout.history.<uid> (iCloud-synced).
- snapshotDay(_:) captures the active program's completed sets on full
  completion and before the daily reset; only days with >=1 done set.
- New WorkoutHistoryView (clock button in the Workout header) lists past
  days newest-first with per-exercise breakdown.
- Log KC-8 (auto-switch / Rest Day) and KC-9 (history) in ISSUES.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

KisaniCal/Views/WorkoutView.swift

@@ -61,6 +61,7 @@ struct WorkoutView: View {
     @EnvironmentObject var vm: WorkoutViewModel
     @State private var showManage = false
     @State private var showAddSection = false
+    @State private var showHistory = false
     @State private var isReordering = false
     @State private var trainAnyway = false   // override the rest-day state for today
     @ObservedObject private var tm = TutorialManager.shared
@@ -100,6 +101,7 @@ struct WorkoutView: View {
                             .foregroundColor(AppColors.text3(cs))
                     }
                     Spacer()
+                    IButton(icon: "clock.arrow.circlepath") { showHistory = true }
                     IButton(icon: "ellipsis") { showManage = true }
                 }
                 .listRowBackground(Color.clear)
@@ -286,6 +288,11 @@ struct WorkoutView: View {
                 .presentationDetents([.large])
                 .presentationDragIndicator(.visible)
         }
+        .sheet(isPresented: $showHistory) {
+            WorkoutHistoryView().environmentObject(vm)
+                .presentationDetents([.large])
+                .presentationDragIndicator(.visible)
+        }
         .sheet(isPresented: $showAddSection) {
             AddSectionSheet().environmentObject(vm)
                 .presentationDetents([.height(240)])
@@ -552,6 +559,77 @@ struct DotProgressCard: View {
     }
 }
 
+// MARK: - Workout History
+struct WorkoutHistoryView: View {
+    @EnvironmentObject var vm: WorkoutViewModel
+    @Environment(\.colorScheme) var cs
+    @Environment(\.dismiss) var dismiss
+
+    private let parser: DateFormatter = {
+        let f = DateFormatter(); f.dateFormat = "yyyy-MM-dd"; return f
+    }()
+    private let pretty: DateFormatter = {
+        let f = DateFormatter(); f.dateFormat = "EEE, MMM d"; return f
+    }()
+
+    private func label(_ key: String) -> String {
+        guard let d = parser.date(from: key) else { return key }
+        if Calendar.current.isDateInToday(d) { return "Today" }
+        if Calendar.current.isDateInYesterday(d) { return "Yesterday" }
+        return pretty.string(from: d)
+    }
+
+    var body: some View {
+        VStack(spacing: 0) {
+            HStack {
+                Text("Workout History").font(AppFonts.sans(17, weight: .bold)).foregroundColor(AppColors.text(cs))
+                Spacer()
+                Button("Done") { dismiss() }.font(AppFonts.sans(13, weight: .semibold)).foregroundColor(AppColors.accent).buttonStyle(.plain)
+            }
+            .padding(.horizontal, 20).padding(.top, 20).padding(.bottom, 14)
+            Divider().background(AppColors.border(cs))
+
+            if vm.historySorted.isEmpty {
+                VStack(spacing: 8) {
+                    Image(systemName: "clock.arrow.circlepath").font(.system(size: 28)).foregroundColor(AppColors.text3(cs))
+                    Text("No history yet").font(AppFonts.sans(14, weight: .semibold)).foregroundColor(AppColors.text2(cs))
+                    Text("Completed workouts are saved here each day.")
+                        .font(AppFonts.sans(11)).foregroundColor(AppColors.text3(cs)).multilineTextAlignment(.center)
+                }
+                .frame(maxWidth: .infinity, maxHeight: .infinity).padding()
+            } else {
+                ScrollView(showsIndicators: false) {
+                    VStack(spacing: 12) {
+                        ForEach(vm.historySorted) { day in
+                            VStack(alignment: .leading, spacing: 10) {
+                                HStack(spacing: 8) {
+                                    ProgramIcon(name: day.programEmoji, size: 14, color: AppColors.accent)
+                                    Text(day.programName).font(AppFonts.sans(14, weight: .semibold)).foregroundColor(AppColors.text(cs))
+                                    Spacer()
+                                    Text(label(day.date)).font(AppFonts.mono(10)).foregroundColor(AppColors.text3(cs))
+                                }
+                                Text("\(day.doneSets)/\(day.totalSets) sets")
+                                    .font(AppFonts.mono(9, weight: .bold)).foregroundColor(AppColors.green)
+                                ForEach(day.exercises) { ex in
+                                    HStack(spacing: 8) {
+                                        Image(systemName: ex.sfSymbol).font(.system(size: 11)).foregroundColor(AppColors.text3(cs)).frame(width: 18)
+                                        Text(ex.name).font(AppFonts.sans(12)).foregroundColor(AppColors.text2(cs))
+                                        Spacer()
+                                        Text("\(ex.doneSets)/\(ex.sets.count)").font(AppFonts.mono(10)).foregroundColor(AppColors.text3(cs))
+                                    }
+                                }
+                            }
+                            .padding(14).cardStyle()
+                        }
+                    }
+                    .padding(.horizontal, 16).padding(.top, 14).padding(.bottom, 30)
+                }
+            }
+        }
+        .background(AppColors.background(cs).ignoresSafeArea())
+    }
+}
+
 // MARK: - Rest Day Card
 struct RestDayCard: View {
     @Environment(\.colorScheme) private var cs