notify: one "balloon on screen" check, NotifyConfig.shown

The desktop companion needs to know when a balloon is showing in her
corner, and the rule lived inline in NotificationBalloon's visible
binding. It moves to the shared library so both shells ask the same
function: drawer, snooze, mute, DND, then expiry.

Shared files do not hot-reload through their links: restart the
notifications and desktop shells after pulling this.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/shared/NotifyConfig.js b/shared/NotifyConfig.js
index 143168f..6fc98e6 100644
--- a/shared/NotifyConfig.js
+++ b/shared/NotifyConfig.js
@@ -71,6 +71,16 @@ function withheld(cfg, n, dnd) {
     return dnd && !(n.urgency === "critical" && cfg.dndPassCritical);
 }
 
+// Whether a queued notification's balloon is on screen at `now`: the drawer
+// and snooze withhold everything, then mute and DND, then its own expiry.
+// The balloon shell and the desktop companion both ask this, so they cannot
+// disagree about what is showing.
+function shown(cfg, n, dnd, drawerOpen, snoozeUntil, now) {
+    if (drawerOpen || snoozeUntil > now) return false;
+    if (withheld(cfg, n, dnd)) return false;
+    return n.expires === 0 || now < n.expires;
+}
+
 // The file a balloon plays, "" for none: the app's suppress-sound wins, then
 // the app's own sound (notifyd resolved its hints), then the urgency's.
 function soundFor(cfg, n) {