signature: add systems map, command palette and motion primitives

Ship the Signature UX as standalone, SSR-safe pieces: bilingual copy, a dual SVG/list systems map, a Map-backed command palette in the shell, opt-in reveal and metric primitives, and a leak-free decorative canvas.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/app.ts

@@ -6,11 +6,12 @@ import { SITE_CONFIG } from './core/content/site-config';
 import { LOCALE_HTML_LANG, otherLocale } from './core/i18n/locale';
 import { LocaleService } from './core/i18n/locale.service';
 import { NavigationService } from './core/navigation/navigation.service';
+import { CommandPalette } from './shared/command-palette/command-palette';
 
 @Component({
   selector: 'app-root',
   changeDetection: ChangeDetectionStrategy.OnPush,
-  imports: [RouterOutlet, RouterLink, RouterLinkActive, DotBackground],
+  imports: [RouterOutlet, RouterLink, RouterLinkActive, DotBackground, CommandPalette],
   templateUrl: './app.html',
   styleUrl: './app.scss',
 })