chore: upgrade Angular 19 to 21 and update dependencies}
- Bump Angular packages from 19.1.4 to 21.2.6 - Bump Angular CDK and Material from 19.1.2 to 21.2.4 - Bump Angular CLI and build tools from 19.1.5 to 21.2.4 - Bump TypeScript from 5.6.3 to 5.9.3 - Bump Node.js version from v22.13.1 to v24.14.1 - Bump @types/node from 22.13.0 to 25.5.0 - Bump postcss from 8.5.1 to 8.5.8 - Bump webpack-bundle-analyzer from 4.10.2 to 5.3.0 - Bump project version from 2025.4.123 to 2026.4.100 - Migrate *ngIf directives to @if control flow syntax in templates - Add provideZoneChangeDetection() to bootstrap configuration - Switch moduleResolution from "node" to "bundler" in tsconfig - Remove explicit lib arrays from tsconfig.json and tsconfig.lib.json - Add Angular schematics configuration to angular.json - Re-indent app.component.html to consistent 2-space indentation - Regenerate yarn.lock with updated dependency tree