feat(apple): gamepad UI v2 — controller settings + add host, aurora, macOS

Sources reorganized (client: Home/Session/Settings/Stores/Support/Trust; kit:
Audio/Connection/Gamepad/Input/Support/Video/Views) with the big files split
along the same seams.

The gamepad mode is couch-complete, and now on macOS too (the living-room
Mac case), not just iOS/iPadOS:

- GamepadSettingsView: a console-style, fully controller-navigable settings
  screen (X from the launcher) — up/down moves focus, left/right steps values
  (clamped, boundary thud), A cycles/toggles, B closes; the focused row shows a
  one-line description. Backed by GamepadMenuList, the vertical sibling of
  GamepadCarousel, and SettingsOptions — the option lists hoisted out of
  SettingsView statics and shared by the touch, tvOS and gamepad settings.
- GamepadAddHostView + GamepadKeyboard: register a host end to end with a pad
  — field rows open an on-screen controller keyboard (dpad grid, A types,
  X backspaces, B done); the launcher carousel ends in an Add Host tile, so
  the dead-end "add one with touch first" empty state is gone.
- Launcher polish: contextual hint bar with the pad's real button glyphs,
  controller name + battery chip, one shared console chrome.
- GamepadScreenBackground: an animated aurora (TimelineView-driven drifting
  blobs in the brand's violet family, breathing radii, slow hue shift,
  legibility scrim; freezes under Reduce Motion). Pure SwiftUI on purpose — a
  .metal library only bundles reliably in one of the two build systems (SPM vs
  the xcodeproj's synced folders) these sources compile under.
- macOS port: settings/add-host/library present as sized sheets (a macOS sheet
  takes its content's IDEAL size, and the GeometryReader-driven screens
  collapsed to nothing), NSScreen-based mode lists, scroll indicators .never
  (the "always show scroll bars" setting overrides .hidden), tray scrims so
  scrolled rows dim under the pinned title/hints, extra title clearance, and a
  PUNKTFUNK_FORCE_GAMEPAD_UI=1 dev hook — launcher/settings/add-host/keyboard/
  library render-verified live on a real Mac + LAN hosts.
- GamepadMenuInput: X button support, and (re)start now snapshots held buttons
  so a controller handoff press never fires twice (the B that closed the
  keyboard no longer also cancels the screen underneath).
- Cleanups: one "Connection failed" alert in ContentView instead of one per
  home screen; HostDiscovery.advertises/unsaved shared by both home screens.
- host: can_encode_444 stub for the non-Linux/Windows host build (the macOS
  synthetic-source loopback used by the Swift tests).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

clients/apple/Sources/PunktfunkClient/Session/StreamCommands.swift

@@ -0,0 +1,49 @@
+// The app's "Stream" menu (macOS menu bar + iPad hardware-keyboard shortcuts). These live at
+// the Scene level so they keep working when the HUD overlay is hidden — in particular ⌘D
+// disconnect, which used to be reachable only via the HUD's button. The toggle just flips the
+// shared `hudEnabled` setting; ContentView reads the same @AppStorage and reacts.
+//
+// tvOS has no menu bar / hardware-keyboard command surface (disconnect there is the Siri
+// Remote's Menu button, handled by ContentView's `.onExitCommand`), so this whole file is
+// non-tvOS only.
+
+#if !os(tvOS)
+import PunktfunkKit
+import SwiftUI
+
+/// The live session's menu-reachable actions, published by ContentView via
+/// `.focusedSceneValue` so the Scene-level commands can drive it.
+struct SessionFocus {
+    var isStreaming: Bool
+    var disconnect: () -> Void
+}
+
+private struct SessionFocusKey: FocusedValueKey {
+    typealias Value = SessionFocus
+}
+
+extension FocusedValues {
+    var sessionFocus: SessionFocus? {
+        get { self[SessionFocusKey.self] }
+        set { self[SessionFocusKey.self] = newValue }
+    }
+}
+
+struct StreamCommands: Commands {
+    @FocusedValue(\.sessionFocus) private var session
+    @AppStorage(DefaultsKey.hudEnabled) private var hudEnabled = true
+
+    var body: some Commands {
+        CommandMenu("Stream") {
+            Button(hudEnabled ? "Hide Statistics" : "Show Statistics") {
+                hudEnabled.toggle()
+            }
+            .keyboardShortcut("s", modifiers: [.command, .shift])
+            Divider()
+            Button("Disconnect") { session?.disconnect() }
+                .keyboardShortcut("d", modifiers: .command)
+                .disabled(session?.isStreaming != true)
+        }
+    }
+}
+#endif