fix(desktop): notification click prefers the focused/visible window

Fixes #78

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/sw.ts

@@ -149,11 +149,19 @@ self.addEventListener('notificationclick', (event: NotificationEvent) => {
 
   event.waitUntil(
     (async () => {
-      const windowClients = await self.clients.matchAll({
-        type: 'window',
-        includeUncontrolled: true,
-      });
-      const client = windowClients.find((c): c is WindowClient => 'focus' in c);
+      const windowClients = (
+        await self.clients.matchAll({
+          type: 'window',
+          includeUncontrolled: true,
+        })
+      ).filter((c): c is WindowClient => 'focus' in c);
+      // #78 — prefer a client that's actually focused, then one that's merely
+      // visible, before falling back to whatever matchAll() returned first (its
+      // ordering is unspecified across browsers and not "most recently used").
+      const client =
+        windowClients.find((c) => c.focused) ??
+        windowClients.find((c) => c.visibilityState === 'visible') ??
+        windowClients[0];
       if (client) {
         await client.focus();
         if (path) client.postMessage({ type: 'notificationClick', path });