chore(test): Add $test alias for easier code organization

[webJose]

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[Copilot]

Pull Request Overview

This PR introduces a $test alias in the SvelteKit configuration to improve import paths for test utilities and components. The alias maps to src/testing, replacing relative paths like ../../testing/ with the cleaner $test/ prefix across all test files and documentation.

• Adds $test alias configuration in svelte.config.js pointing to src/testing
• Updates all test file imports to use the new $test alias
• Updates documentation examples in AGENTS.md to reflect the new import pattern

Reviewed Changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
svelte.config.js	Adds the $test alias configuration mapping to src/testing directory
src/lib/utils.test.ts	Replaces relative import path with $test alias
src/lib/kernel/calculateState.test.ts	Replaces relative import path with $test alias
src/lib/kernel/calculateHref.test.ts	Replaces relative import path with $test alias
src/lib/kernel/StockHistoryApi.svelte.test.ts	Replaces relative import path with $test alias
src/lib/kernel/RouterEngine.svelte.test.ts	Replaces relative import path with $test alias
src/lib/kernel/LocationLite.svelte.test.ts	Replaces relative import path with $test alias
src/lib/kernel/LocationFull.test.ts	Replaces relative import path with $test alias
src/lib/kernel/InterceptedHistoryApi.svelte.test.ts	Replaces relative import path with $test alias
src/lib/behaviors/active.svelte.test.ts	Replaces relative import path with $test alias
src/lib/Router/Router.svelte.test.ts	Replaces relative import path with $test alias
src/lib/Route/Route.svelte.test.ts	Replaces relative import paths with $test alias
src/lib/LinkContext/LinkContext.svelte.test.ts	Replaces relative import path with $test alias
src/lib/Link/Link.svelte.test.ts	Replaces relative import path with $test alias
src/lib/Fallback/Fallback.svelte.test.ts	Replaces relative import path with $test alias
AGENTS.md	Updates documentation examples to use $test alias instead of relative paths

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