chore(tests): Add implicit MHR universe to unit testing

[webJose]

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[Copilot]

Pull Request Overview

This PR adds support for implicit multi-hash routing (IMHR) to the unit testing framework. Previously, the test suite covered five routing universes (implicit path, path, implicit hash, hash, and multi-hash), but lacked coverage for the scenario where multi-hash routing is enabled implicitly via defaultHash.

Key changes:

• Added new "Implicit Multi-Hash Routing" (IMHR) test universe alongside existing routing modes
• Updated test logic across multiple files to handle the new IMHR universe correctly
• Standardized hash identifier from 'p1' to 'tp' throughout test suite

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/testing/test-utils.ts	Added IMHR universe definition and made all RoutingUniverse properties optional to support various routing configurations
src/lib/kernel/resolveHashValue.test.ts	Updated hash identifier from 'p1' to 'tp'
src/lib/kernel/calculateState.test.ts	Added handling for implicit multi-hash routing when defaultHash is a string, updated universe identifier from 'IMP' to 'IPR'
src/lib/kernel/calculateHref.test.ts	Added IMHR-specific logic throughout tests to properly construct and verify multi-hash URLs
src/lib/kernel/RouterEngine.svelte.test.ts	Extended state expectation logic to handle IMHR universe with string defaultHash values
src/lib/kernel/LocationFull.test.ts	Updated hash identifier from 'p1' to 'tp'
src/lib/Route/Route.svelte.test.ts	Replaced boolean hash checking with comprehensive URL construction logic supporting all routing modes including IMHR

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