fix: honor automatic updates preference and add Settings controls

electron/preload.cjs

@@ -19,14 +19,25 @@
  *
  *   window.lh.onUpdateStatus(cb) / window.lh.installUpdate() — the
  *   auto-update channel (Wave C, 2026-10-10): "lh:update-status" pushes
- *   {status:"downloaded", version} once an update is staged; installUpdate
- *   asks main to kill the server and quit-and-install. Browser builds:
- *   both absent, the banner never renders.
+ *   {status, version, revision} on updater events; installUpdate asks main
+ *   to kill the server and quit-and-install. getUpdateState retrieves the
+ *   snapshot for a late subscriber; checkForUpdates requests a manual
+ *   check (including download/install-on-quit, even with automatic checks OFF).
+ *
+ *   window.lh.onOpenSettings(cb) — menu navigation, buffered until React
+ *   subscribes after a window is reopened. Browser builds have no bridge.
  *
  * Channel names are mirrored in electron/main.cjs — keep them in sync.
  */
 const { contextBridge, ipcRenderer } = require("electron");
 
+let openSettingsListener = null;
+let pendingOpenSettings = null;
+ipcRenderer.on("lh:open-settings", (_event, section) => {
+	if (openSettingsListener) openSettingsListener(section);
+	else pendingOpenSettings = section;
+});
+
 contextBridge.exposeInMainWorld("lh", {
 	platform: process.platform,
 	chatgpt: {
@@ -71,4 +82,17 @@ contextBridge.exposeInMainWorld("lh", {
 		return () => ipcRenderer.removeListener("lh:update-status", listener);
 	},
 	installUpdate: () => ipcRenderer.send("lh:update-install"),
+	getUpdateState: () => ipcRenderer.invoke("lh:update:get"),
+	checkForUpdates: () => ipcRenderer.invoke("lh:update:check"),
+	onOpenSettings: (cb) => {
+		openSettingsListener = cb;
+		if (pendingOpenSettings !== null) {
+			const section = pendingOpenSettings;
+			pendingOpenSettings = null;
+			cb(section);
+		}
+		return () => {
+			if (openSettingsListener === cb) openSettingsListener = null;
+		};
+	},
 });