feat(clockout): weekend "今天不上班" mode

Saturday/Sunday previously kept showing the workday countdown even
though no one's working — UX surfaced friction where there was
nothing to count. Now ClockoutView switches to a purple
weekend-hero card with "🌴 今天是周末 · 去做你想做的事" copy.

Implementation:
- WorkerStore.isWeekend computed (Sun=1, Sat=7)
- ClockoutView.body branches: weekendHero + weekendTipText for
  weekend, original countdown+progress+controls for weekday
- Clockout celebration logic still runs in the background — if
  someone does work Saturday and crosses their configured clockout
  hour, the next-weekday view will see the dedupe key updated;
  no spurious extra fire

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Sources/engine/WorkerStore.swift

@@ -576,6 +576,14 @@ final class WorkerStore: ObservableObject {
     /// no observable "zero" frame — celebrating the "下班" moment was
     /// impossible. Now: hit zero, hold zero until midnight, restart at
     /// new day's wall-time countdown.
+    /// True iff today is Saturday or Sunday (local time). Used by
+    /// ClockoutView to switch to a "今天不上班" mode without forcing
+    /// the user to fiddle with their clockout time on the weekend.
+    var isWeekend: Bool {
+        let weekday = calendar.component(.weekday, from: Date())
+        return weekday == 1 || weekday == 7  // Sun = 1, Sat = 7
+    }
+
     var clockoutRemainingSec: Int {
         let now = Date()
         var comps = calendar.dateComponents([.year, .month, .day], from: now)

Sources/ui/ClockoutView.swift

@@ -16,23 +16,22 @@ struct ClockoutView: View {
     var body: some View {
         ZStack(alignment: .top) {
             VStack(spacing: 18) {
-                statusBadge
-
-                countdownDisplay
-
-                progressBar
-
-                controls
-
-                Divider()
-                    .background(WorkerTheme.overlay08)
-                    .padding(.horizontal, 24)
-
-                timeRow
-
-                tipText
-
-                Spacer(minLength: 0)
+                if store.isWeekend {
+                    weekendHero
+                    weekendTipText
+                    Spacer(minLength: 0)
+                } else {
+                    statusBadge
+                    countdownDisplay
+                    progressBar
+                    controls
+                    Divider()
+                        .background(WorkerTheme.overlay08)
+                        .padding(.horizontal, 24)
+                    timeRow
+                    tipText
+                    Spacer(minLength: 0)
+                }
             }
             .padding(.top, 8)
 
@@ -275,6 +274,72 @@ struct ClockoutView: View {
         )
     }
 
+    // MARK: - Weekend mode
+
+    /// Weekend-mode hero — replaces the countdown card with a purple
+    /// "today's a weekend" panel. The clockout countdown still works
+    /// in the background (anyone working Saturday's edge case), but
+    /// the default UI no longer rubs in the fact that there's
+    /// theoretically a clockout time on a day no one's working.
+    private var weekendHero: some View {
+        VStack(spacing: 8) {
+            HStack(spacing: 8) {
+                Circle()
+                    .fill(WorkerTheme.weekendPurple)
+                    .frame(width: 8, height: 8)
+                    .shadow(color: WorkerTheme.weekendPurple.opacity(0.7), radius: 4)
+                Text("今天不上班")
+                    .font(.system(size: 12.5, weight: .semibold))
+                    .foregroundColor(WorkerTheme.fg85)
+            }
+            .padding(.horizontal, 12)
+            .frame(height: 26)
+            .background(Capsule().fill(WorkerTheme.overlay06))
+
+            Text("🌴")
+                .font(.system(size: 64))
+                .padding(.top, 8)
+
+            Text("今天是周末")
+                .font(.system(size: 22, weight: .bold))
+                .foregroundColor(WorkerTheme.fgPrimary)
+
+            Text("去做你想做的事")
+                .font(.system(size: 13))
+                .foregroundColor(WorkerTheme.fg55)
+        }
+        .frame(maxWidth: .infinity)
+        .padding(.vertical, 28)
+        .background(
+            RoundedRectangle(cornerRadius: 14)
+                .fill(
+                    LinearGradient(
+                        colors: [
+                            WorkerTheme.weekendPurple.opacity(0.18),
+                            WorkerTheme.weekendPurple.opacity(0.04)
+                        ],
+                        startPoint: .topLeading, endPoint: .bottomTrailing
+                    )
+                )
+                .overlay(
+                    RoundedRectangle(cornerRadius: 14)
+                        .stroke(WorkerTheme.weekendPurple.opacity(0.35), lineWidth: 0.5)
+                )
+        )
+        .padding(.horizontal, 16)
+        .padding(.top, 12)
+    }
+
+    private var weekendTipText: some View {
+        Text("如果你周末也上班，记得在 周末 tab 取消休息时调整设置。\n（暂时还没做这个 toggle — 反正下周一会自动恢复倒计时。）")
+            .font(.system(size: 11))
+            .foregroundColor(WorkerTheme.fg45)
+            .padding(.horizontal, 20)
+            .padding(.top, 8)
+            .multilineTextAlignment(.center)
+            .frame(maxWidth: .infinity)
+    }
+
     private var tipText: some View {
         Text("到点会有通知 + 一段 Glass 音效庆祝下班\n每日只触发一次，重启插件不会重复响铃。")
             .font(.system(size: 11))