feat: upgrade to Angular 18

  - Update all Angular dependencies to v18.2.12
  - Update Angular CLI and build tools to v18.2.12
  - Update TypeScript to v5.4.0 for Angular 18 compatibility
  - Update Zone.js to v0.14.10
  - Update Angular ESLint to v18.3.0
  - Update ng-packagr to v18.2.0
  - Update Angular CDK/Material to v18.2.13
  - Bump library version to 18.0.0
  - Update peer dependencies to require Angular >=18.0.0

Author: t-ho