fix(desktop): deliver Windows notifications and clear false "blocked" banner

desktop/src/features/notifications/lib/desktop.ts

@@ -5,8 +5,13 @@ import {
   isPermissionGranted,
   onAction,
   requestPermission,
+  sendNotification,
 } from "@tauri-apps/plugin-notification";
-import { isLinuxPlatform, isMacPlatform } from "@/shared/lib/platform";
+import {
+  isLinuxPlatform,
+  isMacPlatform,
+  isWindowsPlatform,
+} from "@/shared/lib/platform";
 
 // Backend event emitted when a native Linux notification is clicked or a
 // queued macOS activation becomes available. See src-tauri notification code.
@@ -146,6 +151,19 @@ export async function getDesktopNotificationPermissionState(): Promise<DesktopNo
     }
   }
 
+  // On Windows the app runs in WebView2, whose DOM `Notification.permission`
+  // reports "denied" by default even though native toasts are delivered by the
+  // Tauri notification plugin. Trusting the DOM value falsely surfaces the
+  // "notifications are blocked" banner and refuses the enable toggle, so read
+  // the plugin (the real delivery path here) as the source of truth instead.
+  if (isTauri() && isWindowsPlatform()) {
+    try {
+      return (await isPermissionGranted()) ? "granted" : "default";
+    } catch {
+      return "default";
+    }
+  }
+
   if (window.Notification.permission !== "default") {
     return window.Notification.permission;
   }
@@ -443,6 +461,26 @@ export async function sendDesktopNotification(
     }
   }
 
+  // On Windows the DOM `Notification` API inside WebView2 does not surface an OS
+  // toast. Post through the Tauri notification plugin, which uses the native
+  // Windows toast system. Click-through comes back via the plugin's `onAction`
+  // listener (registered for non-Linux, non-macOS platforms in
+  // listenForDesktopNotificationActions), which reads the target from `extra`.
+  // `silent` avoids the toast doubling the app's own in-app notification sound.
+  if (isTauri() && isWindowsPlatform()) {
+    try {
+      sendNotification({
+        title: payload.title,
+        body: payload.body,
+        extra: notificationExtra(payload.target),
+        silent: true,
+      });
+      return true;
+    } catch {
+      return false;
+    }
+  }
+
   // block/buzz#5081 — WebKit throws `NotificationError` from the constructor
   // when the notification backend becomes temporarily unavailable. Callers
   // discard the returned promise without a rejection handler, so an

desktop/src/shared/lib/platform.ts

@@ -23,6 +23,15 @@ export function isLinuxPlatform(): boolean {
   );
 }
 
+/** Returns true on Windows desktops (navigator.platform reports "Win32"/"Win64"). */
+export function isWindowsPlatform(): boolean {
+  if (typeof navigator === "undefined") {
+    return false;
+  }
+
+  return /win/i.test(navigator.platform);
+}
+
 /**
  * The platform's normal application-shortcut modifier:
  * - macOS: Command (Meta)