test(workspace): avoid a Tailwind utility token in a spec id

Tailwind scans libs/**/*.ts, including specs, so the test id `m-1` made the
build emit a global `.m-1` utility (+19 bytes of initial CSS). Rename it.

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

libs/workspace/dashboard/feature/src/lib/rails/dashboard-live-epg.presenter.spec.ts

@@ -230,13 +230,13 @@ describe('DashboardLiveEpgPresenter', () => {
             )
         );
         const channel = {
-            id: 'm-1',
+            id: 'ard-hd',
             title: 'Das Erste HD',
             type: 'live',
             source: 'm3u',
             playlist_id: 'a',
             category_id: '',
-            xtream_id: 'm-1',
+            xtream_id: 'ard-hd',
             epg_lookup_key: 'ard.de',
         } as PortalActivityItem;
         favoriteLiveItems.set([channel]);