fix(pwa): stay in server mode when a known server does not answer

A failed start-up probe used to fall back to browser mode, which showed an
empty library while the backend restarted and let new playlists land in the
browser. The browser now remembers the server; without an answer it starts
in server mode, offline, and reloads once the server is back. Settings →
Server shows the backend address instead of the page's.

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

apps/web/src/app/settings/settings-server-section.component.spec.ts

@@ -3,6 +3,7 @@ import { ComponentFixture, TestBed } from '@angular/core/testing';
 import { TranslateModule } from '@ngx-translate/core';
 import { ServerStorageStatusService } from '@iptvnator/services';
 import {
+    SERVER_STORAGE_CONFIG,
     ServerMigrationService,
     ServerStorageSession,
 } from '@iptvnator/services/server-storage';
@@ -37,6 +38,10 @@ describe('SettingsServerSectionComponent', () => {
             providers: [
                 { provide: ServerStorageSession, useValue: session },
                 { provide: ServerMigrationService, useValue: migration },
+                {
+                    provide: SERVER_STORAGE_CONFIG,
+                    useValue: { baseUrl: 'http://nas.local:4333/api' },
+                },
                 {
                     provide: ServerStorageStatusService,
                     useValue: {
@@ -64,6 +69,9 @@ describe('SettingsServerSectionComponent', () => {
         const text = fixture.nativeElement.textContent;
 
         expect(text).toContain('/data/databases/iptvnator.db');
+        expect(byTestId('server-address')?.textContent?.trim()).toBe(
+            'http://nas.local:4333'
+        );
         expect(byTestId('server-state')?.dataset['state']).toBe('online');
         expect(fixture.componentInstance.sizeLabel()).toBe('38.0 MB');
         expect(byTestId('server-sign-out')).toBeNull();