fix(sources): sort by the shown name; start the benchmark's Undo window in its trigger

Local review round 3 (Greptile; Codex was clean):

- Name order compared the stored title, while the rows show a URL-named
  or credential-bearing source by its host: a source stored as
  get.php?username=… sorted by its hidden account details. sortPlaylists
  takes the list's name function, and Sources and the switcher pass
  sourceSortName, the name they display.
- The Xtream delete benchmark clicked Remove while preparing, which starts
  the four-second Undo window; capture setup before the trigger could
  outlast it, so the delete committed on its own before the measurement
  and the close button was gone. Preparation now stops at the open menu,
  and the trigger clicks Remove and then the toast's close button, with
  the trigger time taken right before the commit click as before.

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

libs/playlist/shared/util/src/lib/source-display/source-display.spec.ts

@@ -1,6 +1,7 @@
 import {
     sourceCopyUrl,
     sourceDisplayName,
+    sourceSortName,
     sourceDisplayUrl,
     sourceHost,
 } from './source-display';
@@ -83,6 +84,15 @@ describe('sourceDisplayName', () => {
     });
 });
 
+describe('sourceSortName', () => {
+    it('sorts a source by the name it shows', () => {
+        expect(sourceSortName({ title: 'get.php?x=1', url: M3U_URL })).toBe(
+            sourceDisplayName({ title: 'get.php?x=1', url: M3U_URL })
+        );
+        expect(sourceSortName({ title: '' })).toBe('');
+    });
+});
+
 describe('sourceDisplayUrl', () => {
     it('shows an M3U URL without credentials', () => {
         expect(sourceDisplayUrl({ url: M3U_URL })).toBe(

libs/playlist/shared/util/src/lib/source-display/source-display.ts

@@ -135,6 +135,11 @@ export function sourceDisplayName(
     return containsSourceSecret(raw, playlist) ? host : raw;
 }
 
+/** The name a list shows and sorts a source by; empty when it has none. */
+export function sourceSortName(playlist: SourceDisplayFields): string {
+    return sourceDisplayName(playlist) ?? '';
+}
+
 /** `origin/…/last` once a path has more than two segments. */
 function compactPath(pathname: string): string {
     const segments = pathname.split('/').filter(Boolean);