Watch: activity line on working cards, All threads browsing, a thread's subagents, Load earlier, and markdown messages

watch/WristCode/Views/Theme.swift

@@ -22,6 +22,11 @@ extension Phase {
     }
 }
 
+extension ThreadRow {
+    /// The status dot: amber waiting, teal working, red failed, grey otherwise.
+    var color: Color { phase == .failed ? Theme.bad : phase?.color ?? Theme.done }
+}
+
 /// A dark rounded card with a 4 pt colored left edge.
 struct Card<Content: View>: View {
     var edge: Color
@@ -135,6 +140,16 @@ enum Format {
         return "\(hours / 24) d"
     }
 
+    /// A compact time since a date, such as "42s", "3m", "1h" or "2d", for an activity's elapsed time
+    /// and a thread row's age.
+    static func elapsed(since date: Date, now: Date = .now) -> String {
+        let seconds = max(0, Int(now.timeIntervalSince(date)))
+        if seconds < 60 { return "\(seconds)s" }
+        if seconds < 3600 { return "\(seconds / 60)m" }
+        if seconds < 86_400 { return "\(seconds / 3600)h" }
+        return "\(seconds / 86_400)d"
+    }
+
     /// How long until a date, such as "40 s", "3 min" or "2 h".
     static func countdown(to date: Date, now: Date = .now) -> String {
         let seconds = max(0, Int(date.timeIntervalSince(now).rounded()))