feat(compiler): support new URL(url, base) with string literals

[3kaiu]

Summary

Support the two-argument new URL(url, base) form when both arguments are compile-time string literals. The URL is resolved at compile time using Node's built-in URL class, and a single url.new libcall is emitted with the resolved href.

Details

Previously, any new URL call with more than one argument was fenced with noLowering. This PR:

• Detects when both url and base are string literals → resolves at compile time
• Preserves the fence for non-literal arguments with an improved error message
• For invalid base URLs, emits a diagnostic similar to Node's TypeError

The non-literal case (e.g. new URL(request.url, \"http://localhost\")) remains unsupported and suggests --dynamic as a workaround.

Testing

All existing tests pass: 251 passed, 7 skipped (12 files).

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