build: add missing postcss-import dependency

[ParthMozarkar]

Description

This PR adds postcss-import to the devDependencies in package.json.

Rationale

The project's assets/css/postcss.config.js explicitly requires postcss-import, but the package was not listed as a direct dependency. Explicitly listing it ensures build reproducibility and prevents potential failures in clean environments or CI/CD pipelines where transitive dependencies might not be guaranteed.

Changes

• Added postcss-import to devDependencies in package.json.
• Updated package-lock.json accordingly.

Verification

• Verified that postcss-import is now correctly listed in package.json.
• Ensured the commit is signed-off according to DCO requirements.

Fixes : #743

[nfuden]

Given the current builds are passing I dont see this being necessary as a separate pr from your other pr.
Perhaps in this pr we enhance the action pipeline so that we dont have this drift in general?

[kristin-kronstain-brown]

@ParthMozarkar Would you like to do anything more here?

[ParthMozarkar]

@ParthMozarkar Would you like to do anything more here?

Umm...so sorry I wasn't present here ..was just busy in my exams...happy for reviews !! Do let me know

[kristin-kronstain-brown]

@ParthMozarkar Sorry I was probably cryptic! I meant did you want to address @nfuden's comments? Or could we just close this? I wasn't sure what the other PR was.

[ParthMozarkar]

@ParthMozarkar Sorry I was probably cryptic! I meant did you want to address @nfuden's comments? Or could we just close this? I wasn't sure what the other PR was.

Ahh !! Sorry my bad...yes I"ll address @nfuden's comment before closing the pr !!