Fix: namespace import referencing via value aliases

[tivac]

Description

Updating the internal value mapping after handling imported @values.

Motivation and Context

Fixes #964

How Has This Been Tested?

I added a test that fails before the fix.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have added a changeset for my change.

[changeset-bot]

🦋 Changeset detected

Latest commit: 5dedc7e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 10 packages

Name	Type
@modular-css/processor	Patch
@modular-css/browserify	Patch
@modular-css/cli	Patch
@modular-css/css-to-js	Patch
@modular-css/glob	Patch
@modular-css/postcss	Patch
@modular-css/rollup	Patch
@modular-css/svelte	Patch
@modular-css/vite	Patch
@modular-css/webpack	Patch

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[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (880b5a2) 99.72% compared to head (5dedc7e) 99.72%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #965   +/-   ##
=======================================
  Coverage   99.72%   99.72%           
=======================================
  Files          37       37           
  Lines        1433     1438    +5     
  Branches      235      236    +1     
=======================================
+ Hits         1429     1434    +5     
  Misses          4        4           

Files Changed	Coverage Δ
packages/processor/plugins/values-import.js	100.00% <100.00%> (ø)

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