refactor(plugin-svgr): use import.meta.dirname for loaders

[chenjiahan]

Summary

This PR updates @rsbuild/plugin-svgr to resolve loader.mjs and assetLoader.mjs with import.meta.dirname. It removes the extra fileURLToPath-based __dirname shim while keeping the resolved loader paths unchanged.

Related Links

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[gemini-code-assist]

Code Review

This pull request refactors the SVGR plugin by removing the manual __dirname shim and replacing it with the native import.meta.dirname for resolving loader paths. A critical issue was identified regarding Node.js compatibility: import.meta.dirname is not available in Node.js 18, which is still supported by Rsbuild, and its use will cause runtime errors when passed to path.join.

[Copilot]

Pull request overview

This PR refactors @rsbuild/plugin-svgr loader path resolution to rely on import.meta.dirname instead of a fileURLToPath(import.meta.url)-based __dirname shim, keeping the resulting loader paths the same while simplifying the implementation.

Changes:

• Removed the fileURLToPath / __dirname shim used for resolving loader file paths.
• Updated SVGR-related .loader(...) configuration to use path.join(import.meta.dirname, ...) for loader.mjs and assetLoader.mjs.

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