Make live-run mirroring symmetric: phone-driven runs reach the watch

Two-way driving only worked watch->phone: the watch's navigated driver
broadcast and the phone auto-presented a follower cover. The reverse
failed on both ends — the phone's in-list ExerciseProgressView never
broadcast (only its cover did), and the watch had no surface to present
an incoming run.

- Wire the live channel into the phone's in-list driver (broadcast +
  follow) via a progressView(logID:) helper in WorkoutLogListView.
- Add a watch follower cover (LiveRunCoverView, mirroring the phone's),
  presented from ContentView when the phone drives a run the watch isn't
  already in; the watch bridge gains presentable / muteLive.
- Add a navigatedRunID guard on both sides so a device already in the run
  follows it inline rather than stacking a cover over itself.

Now starting or driving on either device surfaces the run on the other —
as a follower cover when idle, or inline when already in that run — and
either side can take over.

Claude-Session: https://claude.ai/code/session_01SCv7zvGFcKy47KSTnTLxRe

Workouts Watch App/ContentView.swift

@@ -8,7 +8,18 @@
 import SwiftUI
 
 struct ContentView: View {
+    @Environment(WatchConnectivityBridge.self) private var bridge
+
     var body: some View {
         ActiveWorkoutGateView()
+            // The iPhone started driving a run we're not already in — follow it live here.
+            .fullScreenCover(isPresented: Binding(
+                get: { bridge.presentable != nil },
+                set: { presenting in if !presenting { bridge.muteLive() } }
+            )) {
+                if let frame = bridge.presentable {
+                    LiveRunCoverView(frame: frame) { bridge.muteLive() }
+                }
+            }
     }
 }