feat: Apply aria-current: 'page' for active links as default aria- value

[webJose]

Closes #107.

Now, the attribute [aria-current="page"] is applied to active links by default if no value for activeState.aria is provided.

To disable the default, set activeState.aria to an empty object.

[Copilot]

Pull Request Overview

This PR implements default ARIA attributes for active links by applying aria-current="page" automatically when no custom aria attributes are specified. The implementation introduces a new utility function to expand shorthand ARIA attributes and updates the LinkContext to derive expanded aria attributes.

• Adds expandAriaAttributes utility function to convert shorthand ARIA notation (e.g., { current: 'page' }) to full attribute names (e.g., { 'aria-current': 'page' })
• Implements default aria-current="page" behavior for active links when no aria configuration is provided
• Updates LinkContext to track and derive expanded aria attributes from the activeState

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/lib/utils.ts	Adds expandAriaAttributes function to convert shorthand aria attributes to full aria-* format
src/lib/utils.test.ts	Adds comprehensive test coverage for the new expandAriaAttributes utility function
src/lib/LinkContext/LinkContext.svelte.test.ts	Updates tests to use shorthand aria notation and adds tests for activeStateAria derivation
src/lib/LinkContext/LinkContext.svelte	Adds activeStateAria derived property to LinkContext class
src/lib/Link/Link.svelte.test.ts	Adds tests for default aria-current behavior and empty object override
src/lib/Link/Link.svelte	Refactors aria attribute calculation to use new utility and apply defaults

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