fix(core): `invalid URL` error on relative imports

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.49%. Comparing base (85fb9d7) to head (e368099).

Files	Patch %	Lines
core/refs.ts	84.61%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #198 +/- ## ========================================== + Coverage 89.17% 89.49% +0.32% ========================================== Files 13 13 Lines 1090 1095 +5 Branches 133 136 +3 ========================================== + Hits 972 980 +8 + Misses 116 113 -3 Partials 2 2 ```

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