feat: add jwt validation action and docs

[yslpn]

Overview

• add jwt validation action and associated issue/action typings
• cover the feature with targeted runtime and type tests
• document the new action and types on the website, including navigation updates

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[Copilot]

Pull Request Overview

This PR adds JWT (JSON Web Token) validation functionality to the library. It introduces a new validation action that verifies whether a string conforms to the three-part Base64URL-encoded structure of a JWT token.

• Adds jwt() validation action with regex-based format checking
• Implements JwtAction and JwtIssue types with appropriate generics
• Includes comprehensive test coverage for valid/invalid JWT formats

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
website/src/routes/api/menu.md	Adds menu entries for jwt, JwtAction, and JwtIssue API documentation
website/src/routes/api/(types)/JwtIssue/properties.ts	Defines property metadata for JwtIssue type documentation
website/src/routes/api/(types)/JwtIssue/index.mdx	Documents the JwtIssue interface
website/src/routes/api/(types)/JwtAction/properties.ts	Defines property metadata for JwtAction type documentation
website/src/routes/api/(types)/JwtAction/index.mdx	Documents the JwtAction interface
website/src/routes/api/(actions)/jwt/properties.ts	Defines property metadata for jwt function documentation
website/src/routes/api/(actions)/jwt/index.mdx	Provides comprehensive documentation and examples for the jwt validation action
library/src/regex.ts	Adds JWT_REGEX pattern for validating JWT token structure
library/src/actions/jwt/jwt.ts	Implements the jwt validation action with JwtAction and JwtIssue interfaces
library/src/actions/jwt/jwt.test.ts	Adds runtime tests for jwt validation with valid/invalid test cases
library/src/actions/jwt/jwt.test-d.ts	Adds type-level tests for jwt validation action
library/src/actions/jwt/index.ts	Exports jwt validation action
library/src/actions/index.ts	Re-exports jwt from actions index

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