fix: localhost-first host discovery and cancel inFlight on SAS popup close

@@ -104,11 +104,11 @@104104 export function productionDesktopPairingDeps(): DesktopPairingDeps {105105   return {106106     async findHost(port) {107-      // mDNS first — instant and reliable when chrome.mdns is available. But108-      // chrome.mdns can hand back stale/duplicate cache entries (e.g. a host109-      // that's since gone, or one not running `peach-sync pair`), so only commit110-      // to a discovered host that actually accepts a pairing connection right111-      // now; otherwise fall through to the probe.107+      // Localhost first: peach-sync runs on the same machine as the extension.108+      // This works in every browser without mDNS or WebRTC, and is the fastest109+      // path. The daemon binds 0.0.0.0 so 127.0.0.1 is always reachable.110+      if (await wsPortOpen("127.0.0.1", port, 800)) return "127.0.0.1";111+      // mDNS next — instant when chrome.mdns is available (Chrome/Chromium).112112       const discovered = await discoverPeachSync();113113       if (discovered && (await wsPortOpen(discovered.ip, port, 800))) return discovered.ip;114114       // Fallback: /24 subnet probe (Firefox, Chrome without mDNS, or a stale hit).

@@ -227,6 +227,14 @@227227       chrome.runtime.onMessage.addListener(handler);228228       onCleanup(() => chrome.runtime.onMessage.removeListener(handler));229229     }230+    // If the popup closes while the user is on the SAS screen, resolve the231+    // pending background confirm as false so the service worker clears232+    // inFlight and future pairing attempts aren't stuck with "pairing_in_progress".233+    onCleanup(() => {234+      if (desktopPhase() === "sas") {235+        void sendMessage({ type: "DESKTOP_PAIR_CONFIRM", payload: { confirmed: false } });236+      }237+    });230238   });231239 232240   async function handleStartPairing(): Promise<void> {