feat: use oxc-resolver.

[knightedcodemonkey]

BREAKING CHANGES:

• dependencyTree option removed use moduleGraph instead.
• The walker now relies on oxc-resolver so that can change which file resolves for a given specifier (or error out) if you relied on Node's loose fallback behavior.

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 110 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.83%. Comparing base (7ae85d2) to head (cd7c21f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/css/src/moduleGraph.ts	80.63%	107 Missing and 2 partials ⚠️
packages/css/src/css.ts	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
- Coverage   89.77%   87.83%   -1.94%     
==========================================
  Files          10       11       +1     
  Lines        2054     2631     +577     
  Branches      308      414     +106     
==========================================
+ Hits         1844     2311     +467     
- Misses        201      309     +108     
- Partials        9       11       +2     

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