Add a Live Activity for the running workout

A new iOS widget extension shows the active exercise, its phase, and the
work/rest countdown on the lock screen and in the Dynamic Island, driven
by the run flow's live frames so locking the phone mid-set keeps the
timer. The activity is seeded on open, refreshed on every page settle,
dismissed when the flow is left, and cleared on next launch if stranded.
Unifies the build-info stamping across all targets via a YAML anchor.

Claude-Session: https://claude.ai/code/session_01HJDQQDA9QdP8zByg43H5v3

Workouts Widget/WorkoutsWidgetBundle.swift

@@ -0,0 +1,18 @@
+//
+// WorkoutsWidgetBundle.swift
+// Workouts Widget
+//
+// Copyright 2025 Rouslan Zenetl. All Rights Reserved.
+//
+
+import SwiftUI
+import WidgetKit
+
+/// The iOS widget extension's entry point. It currently hosts only the active-workout Live
+/// Activity; ordinary home/lock-screen widgets can be added to the bundle later.
+@main
+struct WorkoutsWidgetBundle: WidgetBundle {
+    var body: some Widget {
+        WorkoutLiveActivity()
+    }
+}