fix: preserve scroll after spa action submits

[Varixo]

The old prevUrl came from routeLocation.prevUrl, which can still point to the route before the current page. After SPA navigation, a plain routeAction$ submit was therefore mistaken for a form navigation from a different page, causing scroll reset. Now we use the actual URL at the start of the current navigation.

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🦋 Changeset detected

Latest commit: 3f1d5d5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@qwik.dev/router	Patch
eslint-plugin-qwik	Patch
@qwik.dev/core	Patch
create-qwik	Patch
@qwik.dev/react	Patch

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commit: 3f1d5d5

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