Repository: angular
Issue: Components sourcemap not resolved when using sub-paths
Labels: area: core,core: stylesheets

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

Don't known / other

### Is this a regression?

Yes

### Description

While using Angular SSR, the dev server is trying to fetch .component.css.map file from an API server instead of Angular server, resulting in 404 error and crashes Node JS server.

This issue occurs when you add custom styles to a component's stylesheet while also having HTTP client enabled. I have included a demo project that has two components - an Index component and a TodoDetail component. A simple CSS styling is included in the index.component.css file. The TodoDetail component makes a HTTP request to an external API using HttpClient service. While on the TodoDetail page, refresh the browser and clear browser cache, then return back to index page by clicking on the back button on the browser, depending whether you have `provideExperimentalZonelessChangeDetection` enabled or not, your dev node js SSR server should either crash or show HttpErrorResponse containing 404 Not Found error.

A demo project is uploaded to github [Acme Todo](https://github.com/rabikr/acme)

## To reproduce the error
1. Run the local dev server by running the command `ng serve`.
2. Open Chrome, navigate to home page.
3. Open Chrome dev tool, go to network tab, select `Disable cache`.
4. On the home page, click any one of the link.
5. Refresh the page while on the todo detail view page. This is clear the cache.
6. Return back to the previous page using the back button.
7. Check server node js logs, it shows the dev server is trying to fetch .component.css.map file from the API server instead of Angular dev server.

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

https://github.com/rabikr/acme

### Please provide the exception or error you saw

```true
ERROR HttpErrorResponse {
  headers: _HttpHeaders {
    headers: Map(25) {
      'access-control-allow-credentials' => [Array],
      'age' => [Array],
      'alt-svc' => [Array],
      'cache-control' => [Array],
      'cf-cache-status' => [Array],
      'cf-ray' => [Array],
      'connection' => [Array],
      'content-length' => [Array],
      'content-type' => [Array],
      'date' => [Array],
      'etag' => [Array],
      'expires' => [Array],
      'nel' => [Array],
      'pragma' => [Array],
      'report-to' => [Array],
      'reporting-endpoints' => [Array],
      'server' => [Array],
      'server-timing' => [Array],
      'vary' => [Array],
      'via' => [Array],
      'x-content-type-options' => [Array],
      'x-powered-by' => [Array],
      'x-ratelimit-limit' => [Array],
      'x-ratelimit-remaining' => [Array],
      'x-ratelimit-reset' => [Array]
    },
    normalizedNames: Map(25) {
      'access-control-allow-credentials' => 'access-control-allow-credentials',
      'age' => 'age',
      'alt-svc' => 'alt-svc',
      'cache-control' => 'cache-control',
      'cf-cache-status' => 'cf-cache-status',
      'cf-ray' => 'cf-ray',
      'connection' => 'connection',
      'content-length' => 'content-length',
      'content-type' => 'content-type',
      'date' => 'date',
      'etag' => 'etag',
      'expires' => 'expires',
      'nel' => 'nel',
      'pragma' => 'pragma',
      'report-to' => 'report-to',
      'reporting-endpoints' => 'reporting-endpoints',
      'server' => 'server',
      'server-timing' => 'server-timing',
      'vary' => 'vary',
      'via' => 'via',
      'x-content-type-options' => 'x-content-type-options',
      'x-powered-by' => 'x-powered-by',
      'x-ratelimit-limit' => 'x-ratelimit-limit',
      'x-ratelimit-remaining' => 'x-ratelimit-remaining',
      'x-ratelimit-reset' => 'x-ratelimit-reset'
    },
    lazyInit: undefined,
    lazyUpdate: null
  },
  status: 404,
  statusText: 'Not Found',
  url: 'https://jsonplaceholder.typicode.com/todos/index.component.css.map',
  ok: false,
  type: undefined,
  name: 'HttpErrorResponse',
  message: 'Http failure response for https://jsonplaceholder.typicode.com/todos/index.component.css.map: 404 Not Found',
  error: {}
}
```

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

```true
Angular CLI: 19.1.4
Node: 22.12.0
Package Manager: npm 11.0.0
OS: win32 x64

Angular: 19.1.3
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, platform-server
... router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1901.4
@angular-devkit/build-angular   19.1.4
@angular-devkit/core            19.1.4
@angular-devkit/schematics      19.1.4
@angular/cli                    19.1.4
@angular/ssr                    19.1.4
@schematics/angular             19.1.4
rxjs                            7.8.1
typescript                      5.7.3
zone.js                         0.15.0
```

### Anything else?

_No response_