feat: close stub-page gaps - profile login/logout, admin Reports/Settings, Help/Docs links

Sprint A: storefront header profile control (login/logout only, no menu),
wired to existing customer Telegram auth (AuthService).

Sprint B: backoffice/reports page, reuses AdminAnalyticsFacade (Sales,
Top Products, Marketplace Health cards + CSV export).

Sprint C: backoffice/settings page, admin UI density preference
(comfortable/compact), localStorage-persisted, applied to app-table
across all admin list pages.

Sprint D: admin bottom-nav Help -> mailto using existing supportEmail,
Documentation -> external link via new TenantConfig.documentationUrl.
AdminNavLink gains externalHref for non-routerLink nav entries.

Docs: docs/GLOBAL-SPRINT-PLAN.md tracks the full sprint breakdown.
docs/COMING-SOON-AUDIT.md removed, folded into docs/KNOWN-ISSUES.md.
docs/BACKEND.md updated with the new documentationUrl bootstrap field.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/features/admin/settings/pages/admin-settings-page.component.ts

@@ -0,0 +1,21 @@
+import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { AdminPreferencesService } from '../services/admin-preferences.service';
+import { TranslatePipe } from '../../../../i18n/translate.pipe';
+import { ToggleComponent } from '../../../../shared/ui/toggle/toggle.component';
+
+@Component({
+  selector: 'app-admin-settings-page',
+  standalone: true,
+  imports: [FormsModule, TranslatePipe, ToggleComponent],
+  templateUrl: './admin-settings-page.component.html',
+  styleUrls: ['./admin-settings-page.component.scss'],
+  changeDetection: ChangeDetectionStrategy.OnPush
+})
+export class AdminSettingsPageComponent {
+  readonly preferences = inject(AdminPreferencesService);
+
+  onCompactToggle(compact: boolean): void {
+    this.preferences.setDensity(compact ? 'compact' : 'comfortable');
+  }
+}