main.js ends up in Lazy loaded Chunks

### Which @angular/* package(s) are the source of the bug?

core

### Is this a regression?

Yes

### Description

setting the **bundleName** for one of the styles to "main" results in main.js end up in **Lazy Loaded Chunks** category
That also means the main.js doesn't have any hash at the end of it's filename.

```
{
"input": "styles/main.scss",
"bundleName": "main",
"inject": false
},
```

```
Initial chunk files | Names | Raw size | Estimated transfer size
polyfills.45732861e6a6851d.js | polyfills | 34.19 kB | 11.03 kB

| Initial total | 34.19 kB | 11.03 kB

Lazy chunk files | Names | Raw size | Estimated transfer size
main.css, main.js | main | 277.90 kB | 49.44 kB
runtime.a9fc7548b14f6ea7.js | runtime | 1.06 kB | 587 bytes
```

Proposed solution

Angular should report this collision as a warning. I spent hours figuring this out.

### Please provide a link to a minimal reproduction of the bug

_No response_

### Please provide the exception or error you saw

_No response_

### Please provide the environment you discovered this bug in (run `ng version`)

Angular: 18.1.4
... animations, cdk, cli, common, compiler, compiler-cli, core
... forms, language-service, platform-browser
... platform-browser-dynamic, router

Package Version
---------------------------------------------------------
@angular-devkit/architect 0.1801.4
@angular-devkit/build-angular 18.1.4
@angular-devkit/core 18.1.4
@angular-devkit/schematics 18.1.4
@schematics/angular 18.1.4
rxjs 7.8.1
typescript 5.5.4
zone.js 0.14.4

### Anything else?

_No response_

まず、bundleName "main" と inject false を使用して、Angular 18.1.4 で示されている styles 設定による問題を再現し、その後、build が生成されたファイルをどのように分類するかを調べます。名前の衝突が警告として報告され、紛らわしい lazy-chunk の出力が対処されれば完了です。

索引モデルが issue の本文から書いたものです。