fix: bump 18 deps and add 8 overrides to resolve Snyk vulnerabilities

Direct dep upgrades:
  @angular/common 21.2.17 → 21.2.19
  @angular/compiler 21.2.17 → 21.2.19
  @angular/core 21.2.17 → 21.2.19
  @angular/compiler-cli 21.2.17 → 21.2.19
  @angular/platform-browser 21.2.17 → 21.2.19
  @angular/router 21.2.17 → 21.2.19
  @angular-devkit/build-angular 21.2.15 → 21.2.20
  @angular/cli 21.2.15 → 21.2.20
  postcss 8.5.24 → 8.5.26
  @contentstack/delivery-sdk ^5.2.1 → ^5.5.2
  @contentstack/live-preview-utils ^4.4.4 → ^4.4.5
  tailwindcss ^4.3.1 → ^4.3.3
  @tailwindcss/postcss ^4.3.1 → ^4.3.3
  @types/react ^19.2.17 → ^19.2.18
  @rollup/rollup-linux-x64-gnu ^4.62.0 → ^4.62.4
  @rollup/rollup-linux-x64-musl ^4.62.0 → ^4.62.4
  lightningcss-linux-x64-gnu 1.32.0 → 1.33.0
  lightningcss-linux-x64-musl 1.32.0 → 1.33.0

Overrides added:
  @babel/core@7.29.6, @hono/node-server@2.0.6, esbuild@0.28.1
  http-proxy-middleware@3.0.7, piscina@5.2.0, undici@7.29.0
  uuid@14.0.1, webpack-dev-server@5.2.6

Package version: 0.1.2 → 0.1.3
Vuln count: 15 (before) → 11 (after). Build verified passing.

Author: cs-raj