refactor(Link): Use isRouteActive() and take style calculation to a s…

[webJose]

…eparate, importable function

[Copilot]

Pull Request Overview

This PR refactors the Link component by extracting inline style calculation logic into a reusable utility function and replacing custom active route detection with a centralized isRouteActive() function.

• Extracted style merging logic from Link component into a standalone joinStyles() utility function
• Replaced inline active route detection with isRouteActive() function from public-utils
• Added necessary type imports to support the new utility function

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/lib/utils.ts	Added joinStyles() utility function for combining CSS styles and imported required types
src/lib/Link/Link.svelte	Replaced inline style calculation and active route detection with imported utility functions

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