Angular 21 Upgrade & Playwright Support

[wlucha]

Summary

Major upgrade of the Angular Starter project from Angular 20 to Angular 21, along with a full modernization of the development tooling stack.

Angular 21 Migration

• Upgraded all @angular/* core packages, CLI, and Material to v21
• Bumped TypeScript to 5.9.3 (required by Angular 21)
• Updated @angular-eslint schematics and plugins to v21

Storybook v10

• Upgraded Storybook from v8 to v10.2.10
• Removed obsolete v8 addon packages (@storybook/addon-essentials, @storybook/blocks, etc.) that are no longer needed in v10
• Aligned @storybook/angular and eslint-plugin-storybook to v10

Cypress → Playwright Migration

• Removed Cypress and @cypress/schematic entirely
• Added @playwright/test with Chromium, Firefox, and WebKit browser support
• Created playwright.config.ts with auto-start of the Angular dev server
• Migrated E2E test to Playwright syntax (tests/app.spec.ts)
• npm run e2e now runs Playwright across all 3 browser engines ✅

DevDependencies Upgraded to Latest

• ESLint → v10 (with @eslint/js and @eslint/eslintrc as explicit deps)
• Jest → v30, jest-preset-angular → v16
• @commitlint → v20, @babel/core → v7.29, babel-loader → v10
• prettier → v3.8, @types/node → v25, @jsverse/transloco → v8
• tailwindcss & @tailwindcss/postcss → v4.2

Dependency Resolution

• Added .npmrc with legacy-peer-deps=true to handle ESLint v10 peer dependency conflicts with @angular-eslint (which hasn't updated its peer range yet)
• Added overrides in package.json for @typescript-eslint/* TypeScript version compatibility
• Added transformIgnorePatterns to Jest config for @jsverse ESM module support
• Updated husky prepare script from deprecated husky install to husky

Verification

• ✅ npm run build:prod — production build passes
• ✅ npm run test:ci — all unit tests pass
• ✅ npm run lint — linting passes (ESLint 10)
• ✅ npm run e2e — 3/3 Playwright E2E tests pass (Chromium, Firefox, WebKit)

Resolves #37 & #40