feat(jac-client): add custom import path aliases via [plugins.client.paths]

[marsninja]

Summary

• Add support for user-defined import path aliases in jac-client
• Aliases sync automatically to both Vite resolve.alias and TypeScript compilerOptions.paths
• Single source of truth in jac.toml for path configuration

Usage

[plugins.client.paths]
"@components/*" = "./components/*"
"@utils/*" = "./utils/*"
"@api" = "./api/index.jac"

This generates:

vite.config.js:

resolve: {
  alias: {
    "@jac-client/utils": path.resolve(buildDir, "compiled/client_runtime.js"),
    "@jac-client/assets": path.resolve(buildDir, "compiled/assets"),
    "@components": path.resolve(projectRoot, "components"),
    "@utils": path.resolve(projectRoot, "utils"),
  },
}

tsconfig.json:

{
  "compilerOptions": {
    "baseUrl": ".",
    "paths": {
      "@components/*": ["components/*"],
      "@utils/*": ["utils/*"]
    }
  }
}

Test plan

• Add [plugins.client.paths] to a test project's jac.toml
• Run jac build and verify generated configs contain the aliases
• Verify imports using custom paths compile successfully