[drewnielson]

This PR modernizes the ART Angular application and its test/build toolchain:

• Upgrades Angular from 20 to 22, TypeScript to 6.0, RxJS to 7.8, and Zone.js to 0.16.
• Replaces Angular’s deprecated Webpack builders with the esbuild/Vite-based @angular/build application and development-server builders.
• Preserves the existing art/ output structure used by Jekyll and deployment.
• Migrates the unit-test suite from Karma/Jasmine to Vitest with jsdom.
• Updates tests for Vitest spies, mocks, native async handling, and the new Angular testing environment.
• Replaces RouterTestingModule with provideRouter.
• Removes the obsolete Karma configuration, test bootstrap, Jasmine/Karma packages, and direct Istanbul dependency.
• Removes deprecated rimraf and the unused, destructive reset script.
• Removes the unused internal Angular compiler import.
• Replaces the CommonJS clipboard-copy package with the native Clipboard API.
• Adds an explicit browser buffer dependency required by docx under esbuild.
• Updates html-validate to 10.17.0 and JSZip to 3.10.2.
• Removes obsolete Webpack-related dependency overrides.
• Adds explicit, pinned install-script approvals and denials so clean installs no longer emit unreviewed-script warnings.
• Refreshes the npm lockfile and substantially reduces the installed dependency count.