Various updates

[rturnq]

Description

• Support css-loader imports (eg. remove ~ prefixes)
• Only transform transform relative src attributes for asset types that Vite doesn't transform (eg. exclude js/css) or if the path includes ?url
• Use the env var BASE_URL as config.base when it is not set

Motivation and Context

Screenshots (if appropriate):

Checklist:

• I have updated/added documentation affected by my changes.
• I have added tests to cover my changes.

[changeset-bot]

🦋 Changeset detected

Latest commit: 536dce5

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

This PR includes changesets to release 1 package

Name	Type
@marko/vite	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.27%. Comparing base (53e1bd4) to head (cc0dc4e).
Report is 3 commits behind head on main.

❗ Current head cc0dc4e differs from pull request most recent head 536dce5. Consider uploading reports for the commit 536dce5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
+ Coverage   72.22%   72.27%   +0.05%     
==========================================
  Files          11       11              
  Lines         648      660      +12     
  Branches      156      162       +6     
==========================================
+ Hits          468      477       +9     
  Misses        123      123              
- Partials       57       60       +3     

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