setup: the installer is our own window — the alpha key is the gate, the release comes down with it and is verified before the silent install, and the in-app tour asks for the key too

src/lib/updater.svelte.js

@@ -10,9 +10,15 @@ export const updater = $state({
     progress: null,
     /** The toast for the current find was dismissed. */
     dismissed: false,
+    /** The "updates need your alpha key" nudge was waved away this session. */
+    nudgeDismissed: false,
     error: "",
 });
 
+export function dismissNudge() {
+    updater.nudgeDismissed = true;
+}
+
 export const updateAvailable = () => updater.status?.available ?? null;
 
 export async function refreshUpdater() {