fix(clients): dial-first reconnect — don't gate the connect on mDNS presence

A saved host that stopped advertising on mDNS but has a learned Wake-on-LAN
MAC was routed into a wake-and-WAIT-for-mDNS flow instead of being dialed. For
a host reached over a routed network (Tailscale/VPN/another subnet) mDNS never
sees it, so the wait could never succeed and reconnects were impossible — the
host log showed no connection attempt at all. The tile's Offline pip and this
connect gate shared the same LAN-only `advertises`/`liveAdvert` predicate, so a
perfectly reachable host read as unreachable. The first connect worked only
because the MAC hadn't been learned yet (a direct dial); once learned, every
reconnect wedged in the waker.

All four full clients carried this pattern (deliberate mirrors of the Apple
`HostWaker`). Each now DIALS FIRST: fire the magic packet up front
(fire-and-forget — harmless if the host is awake, and a genuinely-asleep box is
booting while the dial times out) and attempt the connection unconditionally.
Only a FAILED dial falls into the visible "Waking…" wait, whose redial carries
no fallback so it can't loop. A fingerprint-mismatch/trust-rejection failure
means the host ANSWERED, so it never takes the wake path.

- apple: SessionModel.connect gains `onUnreachable`; startSession dials first.
- linux (relm4): AppMsg::WakeConnect wakes+dials; a per-request wake_fallback
  is armed and consumed in SessionExited, matched by fingerprint/address.
- windows: initiate_waking + ConnectOpts.wake_on_fail; the worker's Failed arm
  escalates to wake_and_connect only on a non-trust failure.
- android: doConnectDirect gains onFailure; doConnect wakes+dials first.

Decky was already correct (always launches `--connect`; WoL fire-and-forget).
Explicit "Wake host" menu actions are unchanged — waiting on mDNS is right when
the user explicitly asked to wake a box.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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

@@ -135,6 +135,10 @@ final class SessionModel: ObservableObject {
     /// successful connect streams directly (the approval IS the trust decision) — the caller pins
     /// the observed fingerprint as paired. `host.pinnedSHA256`, when set, pins the advertised cert
     /// for the wait; nil = trust-on-first-use.
+    /// `onUnreachable`, when set, replaces the "could not connect" alert for a plain connect
+    /// failure: the caller takes over recovery (the Wake-on-LAN wait for a host that stopped
+    /// advertising). It never fires for the delegated-approval path, whose failure text carries
+    /// its own instructions.
     func connect(to host: StoredHost, width: UInt32, height: UInt32, hz: UInt32,
                  compositor: PunktfunkConnection.Compositor = .auto,
                  gamepad: PunktfunkConnection.GamepadType = .auto,
@@ -145,7 +149,8 @@ final class SessionModel: ObservableObject {
                  launchID: String? = nil,
                  allowTofu: Bool = false,
                  autoTrust: Bool = false,
-                 requestAccess: Bool = false) {
+                 requestAccess: Bool = false,
+                 onUnreachable: (@MainActor () -> Void)? = nil) {
         guard phase == .idle else { return }
         phase = .connecting
         activeHost = host
@@ -241,7 +246,11 @@ final class SessionModel: ObservableObject {
                 case .failure:
                     self.phase = .idle
                     self.activeHost = nil
-                    if requestAccess {
+                    if let onUnreachable, !requestAccess {
+                        // The caller owns recovery (wake-and-retry) — no error alert here; its
+                        // own overlay explains what's happening.
+                        onUnreachable()
+                    } else if requestAccess {
                         // The delegated-approval connect ended without being admitted: the
                         // operator didn't approve it before the host's park window elapsed (or
                         // the host was unreachable).