fix(esbuild): dont reference non existent css file in vite manifest

[shyim]

No description provided.

[Copilot]

Pull request overview

This PR fixes an issue where the Vite entrypoints manifest would reference a CSS file even when it doesn't exist. The fix checks for the CSS file's existence before including it in the manifest.

Key changes:

• Added logic to check if the CSS file exists before including it in the entrypoints.json manifest
• Updated existing test to create the CSS file explicitly when testing the case where CSS should be included
• Added a new test to verify the behavior when no CSS file exists

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
internal/esbuild/vite_config.go	Added filepath import and CSS file existence check that removes the CSS entry from entrypoints when the file doesn't exist
internal/esbuild/vite_config_test.go	Modified TestDumpViteEntrypoint to create CSS file explicitly, and added TestDumpViteEntrypointNoCssFile to test the no-CSS-file scenario

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