fix(InterceptedHistoryApi): Only override pushState and replaceState

[webJose]

Fixes #174.

[Copilot]

Pull request overview

This PR modifies the InterceptedHistoryApi to selectively override only the pushState and replaceState methods of the browser's window.history object, rather than replacing the entire history object. This is a more surgical approach that reduces potential side effects and maintains better compatibility with other code that might interact with the history API.

Key changes:

• Store and override only pushState and replaceState methods instead of replacing the entire history object
• Update disposal logic to restore only the overridden methods
• Update tests to verify method-level overrides rather than object replacement

Reviewed changes

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

File	Description
src/lib/kernel/InterceptedHistoryApi.svelte.ts	Changed from storing/replacing entire history object to storing/overriding only pushState and replaceState methods
src/lib/kernel/InterceptedHistoryApi.svelte.test.ts	Updated tests to verify method-level interception and restoration instead of object replacement

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