feat(apple): wake-until-up overlay + host edit with MAC prefill

- HostWaker + WakeOverlay: after sending the Wake-on-LAN packet, wait until the host
  is really back (resend + mDNS poll, timeout, cancel/retry) before connecting.
  macOS-only in practice — WoL stays gated off on iOS/tvOS pending the multicast
  entitlement.
- Add/Edit host sheet gains a Wake-on-LAN MAC field, prefilled from the stored MAC
  or the live mDNS advert; parseMacs validates aa:bb:cc:dd:ee:ff.
- Gamepad chrome/home and glass-style polish.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

clients/apple/Sources/PunktfunkClient/Stores/HostStore.swift

@@ -98,6 +98,13 @@ final class HostStore: ObservableObject {
         hosts.removeAll { $0.id == host.id }
     }
 
+    /// Replace a saved host in place (the edit sheet) — matched by id, so identity/pin/last-connected
+    /// carried on the passed value are preserved.
+    func update(_ host: StoredHost) {
+        guard let i = hosts.firstIndex(where: { $0.id == host.id }) else { return }
+        hosts[i] = host
+    }
+
     func markConnected(_ hostID: UUID) {
         guard let i = hosts.firstIndex(where: { $0.id == hostID }) else { return }
         hosts[i].lastConnected = Date()