fix(web): AcoustID card's loading line names itself (M401 #3922)

Its bare "Loading…" made the Integrations page's cover-providers test find
two matches for /loading…/i (Vitest, run 8487). "Loading AcoustID
settings…" also says which card is loading.

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

web/src/routes/admin/integrations/integrations.test.ts

@@ -29,7 +29,8 @@ vi.mock('$lib/api/admin', () => ({
   createSMTPConfigQuery: vi.fn(),
   updateSMTPConfig: vi.fn(),
   testSMTPConfig: vi.fn(),
-  // AcoustIDCard loads on mount; a never-settling read leaves it on "Loading…".
+  // AcoustIDCard loads on mount; a never-settling read leaves it on its own
+  // "Loading AcoustID settings…", which the page's /loading…/i queries skip.
   getAcoustID: vi.fn(() => new Promise(() => {})),
   updateAcoustIDSettings: vi.fn(),
   runAcoustIDLookup: vi.fn(),