feat: Major navigation improvements

[webJose]

Fixes #25.

LOC delta: +166

[Copilot]

Pull Request Overview

This PR implements major navigation improvements by introducing new navigation APIs, state management enhancements, and comprehensive query preservation functionality. The changes address issue #25 with significant architectural improvements to the routing system.

Key changes include:

• Introduction of new goTo() method alongside refactored navigate() method with enhanced options
• Implementation of robust query parameter preservation system with flexible configuration options
• Addition of utility functions for href calculation, state management, and URL parsing

Reviewed Changes

Copilot reviewed 25 out of 26 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/lib/types.ts	Adds PreserveQuery type and restructures navigation options with new GoToOptions and NavigateOptions types
src/lib/index.ts	Exports new utility functions and fixes null safety in cleanup function
src/lib/core/preserveQuery.ts	Implements query parameter preservation logic with support for boolean, string, and array configurations
src/lib/core/dissectHrefs.ts	Adds URL parsing utility to extract paths, search parameters, and hashes from href strings
src/lib/core/calculateState.svelte.ts	Implements state calculation logic that preserves routing universe states during navigation
src/lib/core/calculateHref.ts	Provides comprehensive href calculation with query preservation and multi-hash support
src/lib/core/RouterEngine.svelte.ts	Refactors joinPaths function to handle leading slash detection more robustly
src/lib/core/LocationState.svelte.ts	Adds state validation and warning system for non-conformant history states
src/lib/core/LocationLite.svelte.ts	Implements new navigation methods and integrates with utility functions
src/lib/Link/Link.svelte	Updates Link component to use new href calculation and state management utilities
package.json	Updates dependencies to newer versions including Svelte 5.31.0

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