Add windows nightly update banner (#42576)

Hopefully this will nudge some of the beta users who were on nightly to
get on the official stable builds now that they're out.

Release Notes:

- N/A

crates/zed/Cargo.toml

@@ -171,6 +171,7 @@ chrono.workspace = true
 
 [target.'cfg(target_os = "windows")'.dependencies]
 windows.workspace = true
+chrono.workspace = true
 
 [target.'cfg(target_os = "windows")'.build-dependencies]
 winresource = "0.1"

crates/zed/src/zed.rs

@@ -393,6 +393,9 @@ pub fn initialize_workspace(
             }
         }
 
+        #[cfg(target_os = "windows")]
+        unstable_version_notification(cx);
+
         let edit_prediction_menu_handle = PopoverMenuHandle::default();
         let edit_prediction_button = cx.new(|cx| {
             edit_prediction_button::EditPredictionButton::new(
@@ -471,6 +474,53 @@ pub fn initialize_workspace(
     .detach();
 }
 
+#[cfg(target_os = "windows")]
+fn unstable_version_notification(cx: &mut App) {
+    if !matches!(
+        ReleaseChannel::try_global(cx),
+        Some(ReleaseChannel::Nightly)
+    ) {
+        return;
+    }
+    let db_key = "zed_windows_nightly_notif_shown_at".to_owned();
+    let time = chrono::Utc::now();
+    if let Some(last_shown) = db::kvp::KEY_VALUE_STORE
+        .read_kvp(&db_key)
+        .log_err()
+        .flatten()
+        .and_then(|timestamp| chrono::DateTime::parse_from_rfc3339(&timestamp).ok())
+    {
+        if time.fixed_offset() - last_shown < chrono::Duration::days(7) {
+            return;
+        }
+    }
+    cx.spawn(async move |_| {
+        db::kvp::KEY_VALUE_STORE
+            .write_kvp(db_key, time.to_rfc3339())
+            .await
+    })
+    .detach_and_log_err(cx);
+    struct WindowsNightly;
+    show_app_notification(NotificationId::unique::<WindowsNightly>(), cx, |cx| {
+        cx.new(|cx| {
+            MessageNotification::new("You're using an unstable version of Zed (Nightly)", cx)
+                .primary_message("Download Stable")
+                .primary_icon_color(Color::Accent)
+                .primary_icon(IconName::Download)
+                .primary_on_click(|window, cx| {
+                    window.dispatch_action(
+                        zed_actions::OpenBrowser {
+                            url: "https://zed.dev/download".to_string(),
+                        }
+                        .boxed_clone(),
+                        cx,
+                    );
+                    cx.emit(DismissEvent);
+                })
+        })
+    });
+}
+
 #[cfg(any(target_os = "linux", target_os = "freebsd"))]
 fn initialize_file_watcher(window: &mut Window, cx: &mut Context<Workspace>) {
     if let Err(e) = fs::fs_watcher::global(|_| {}) {