iOS 1.0 RC 1: battery and heat work, version label, web player redraw tweaks

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ios/Stemify/App/StemifyApp.swift

@@ -36,6 +36,7 @@ struct StemifyApp: App {
             RootView()
         }
         .onChange(of: phase) { _, p in
+            AppActivity.setPhone(p != .background)
             guard p == .active else { return }
             AppGraph.shared.eq.refreshRoute()
             // Keep downloaded playlists in step with the server, like Plexamp.

ios/Stemify/App/WidgetBridge.swift

@@ -34,6 +34,7 @@ final class WidgetBridge: @unchecked Sendable {
     private var last: WidgetSnapshot?
     private var artKey: String?
     private var savedArt: String?
+    private var pending: DispatchWorkItem?
 
     func start(_ g: AppGraph) {
         let pm = g.playback, s = g.settings, plex = g.plex
@@ -46,13 +47,19 @@ final class WidgetBridge: @unchecked Sendable {
     }
 
     /// Writes the snapshot and asks WidgetKit to redraw, but only when something the widgets show has changed.
+    /// Changes settle for a moment first: a fader drag would otherwise relaunch the widget extension every frame.
     func publish(_ pm: PlaybackManager, _ s: Settings, force: Bool = false) {
         let snap = make(pm, s)
         guard force || snap != last else { return }
         last = snap
-        WidgetStore.save(snap)
-        WidgetCenter.shared.reloadAllTimelines()
-        if #available(iOS 18.0, *) { ControlCenter.shared.reloadAllControls() }
+        pending?.cancel()
+        let push = DispatchWorkItem {
+            WidgetStore.save(snap)
+            WidgetCenter.shared.reloadAllTimelines()
+            if #available(iOS 18.0, *) { ControlCenter.shared.reloadAllControls() }
+        }
+        pending = push
+        if force { push.perform() } else { DispatchQueue.main.asyncAfter(deadline: .now() + 0.6, execute: push) }
     }
 
     private func make(_ pm: PlaybackManager, _ s: Settings) -> WidgetSnapshot {