manifest icons lack standard 192x192 size and maskable purpose

### Issue 2: PWA Web App Manifest Configuration (Enhancement / Bug)

**Title:** `fix(pwa): manifest icons lack standard 192x192 size and maskable purpose`

**Body:**
```markdown
### Description
In `vite.config.ts`, the `VitePWA` manifest only specifies a single icon with size `512x512`:

```ts
icons: [
  {
    src: '/favicon.png',
    sizes: '512x512',
    type: 'image/png',
  },
]