Rework the Apple Watch progress flow

Watch root lists every in-progress workout; picking an exercise runs a paged Ready -> work/rest -> Finish flow (One More + auto-firing Done), with a phase-dot row and brand-tinted count-up/down timers. Includes the configurable rest and auto-finish settings synced over WatchConnectivity and the wrist-down timer fix.

Shared/Connectivity/WCPayload.swift

@@ -10,17 +10,19 @@ enum WCPayload {
     static let workoutsKey = "workouts"
     static let workoutKey = "workout"
     static let restSecondsKey = "restSeconds"
+    static let doneCountdownSecondsKey = "doneCountdownSeconds"
 
     static let workoutUpdateType = "workoutUpdate"   // watch → phone (one workout)
     static let requestSyncType = "requestSync"       // watch → phone (please push state)
 
     // MARK: - Phone → Watch (application context: latest-state-wins)
 
-    static func encodeState(splits: [SplitDocument], workouts: [WorkoutDocument], restSeconds: Int) -> [String: Any] {
+    static func encodeState(splits: [SplitDocument], workouts: [WorkoutDocument], restSeconds: Int, doneCountdownSeconds: Int) -> [String: Any] {
         var dict: [String: Any] = [:]
         if let s = try? DocumentCoder.encoder.encode(splits) { dict[splitsKey] = s }
         if let w = try? DocumentCoder.encoder.encode(workouts) { dict[workoutsKey] = w }
         dict[restSecondsKey] = restSeconds
+        dict[doneCountdownSecondsKey] = doneCountdownSeconds
         return dict
     }
 
@@ -36,6 +38,8 @@ enum WCPayload {
 
     static func decodeRestSeconds(_ dict: [String: Any]) -> Int? { dict[restSecondsKey] as? Int }
 
+    static func decodeDoneCountdownSeconds(_ dict: [String: Any]) -> Int? { dict[doneCountdownSecondsKey] as? Int }
+
     // MARK: - Watch → Phone (a single updated workout)
 
     static func encodeWorkoutUpdate(_ workout: WorkoutDocument) -> [String: Any] {