fix(notifications): spawn notify-send without AppImage library overrides

Electron AppImages export LD_LIBRARY_PATH pointing at bundled libraries
whose stale libnotify kills the system notify-send with a symbol lookup
error, permanently disabling in-place replacement and forcing the
flickering Electron close-and-reopen fallback. Drop the override from
the child environment so the system binary resolves its own libraries.

src/core/utils/notification.test.ts

@@ -1,6 +1,22 @@
 import assert from 'node:assert/strict';
 import test from 'node:test';
-import { createNotifySendReplacer, resolveDefaultNotificationIconPath } from './notification';
+import {
+  buildNotifySendEnv,
+  createNotifySendReplacer,
+  resolveDefaultNotificationIconPath,
+} from './notification';
+
+test('notify-send child environment drops the AppImage library-path override', () => {
+  const env = buildNotifySendEnv({
+    LD_LIBRARY_PATH: '/tmp/.mount_SubMinXXXXXX/usr/lib',
+    DBUS_SESSION_BUS_ADDRESS: 'unix:path=/run/user/1000/bus',
+    HOME: '/home/user',
+  });
+
+  assert.equal(env.LD_LIBRARY_PATH, undefined);
+  assert.equal(env.DBUS_SESSION_BUS_ADDRESS, 'unix:path=/run/user/1000/bus');
+  assert.equal(env.HOME, '/home/user');
+});
 
 test('default notification icon resolves packaged SubMiner asset when no per-notification icon is provided', () => {
   const path = resolveDefaultNotificationIconPath({

src/core/utils/notification.ts

@@ -203,8 +203,19 @@ export function createNotifySendReplacer(
   };
 }
 
+/**
+ * Electron AppImages export `LD_LIBRARY_PATH=<mount>/usr/lib`, whose bundled libnotify predates the
+ * symbols the system notify-send links against, so an inherited environment kills the child with a
+ * symbol lookup error before it can send anything. A system binary resolves its own libraries fine,
+ * so the override is dropped entirely rather than filtered.
+ */
+export function buildNotifySendEnv(env: NodeJS.ProcessEnv = process.env): NodeJS.ProcessEnv {
+  const { LD_LIBRARY_PATH: _dropped, ...rest } = env;
+  return rest;
+}
+
 const showLinuxReplaceableNotification = createNotifySendReplacer((args, callback) =>
-  execFile('notify-send', args, { timeout: 5_000 }, (error, stdout) =>
+  execFile('notify-send', args, { timeout: 5_000, env: buildNotifySendEnv() }, (error, stdout) =>
     callback(error, stdout ?? ''),
   ),
 );