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_

Beginne damit, das Problem mit der gezeigten styles-Konfiguration unter Angular 18.1.4 zu reproduzieren, wobei bundleName "main" und inject false verwendet werden, und untersuche anschließend, wie der Build die generierten Dateien klassifiziert. Als erledigt gilt die Aufgabe, wenn die Namenskollision als Warnung gemeldet wird und die verwirrende Ausgabe des Lazy-Chunks behoben ist.

Vom Indexierungsmodell aus dem Issue-Text verfasst.