fix: solve prevUrl on first render issue

[damianpumar]

What is it?

• Fix https://github.com/QwikDev/qwik/issues/6625

Description

The first time you load a route, prevUrl should be undefined

https://github.com/user-attachments/assets/cc499a87-c65f-4d38-86e2-841d7846aa18

Checklist

• [x] My code follows the developer guidelines of this project
• [x] I performed a self-review of my own code
• [x] I added a changeset with pnpm change
• [x] I made corresponding changes to the Qwik docs
• [ ] I added new tests to cover the fix / functionality

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: f0c8e18b6668a6313288d76ebaaa718a3b73bf9b

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

This PR includes changesets to release 4 packages

| Name | Type | | --------------------- | ----- | | @builder.io/qwik-city | Patch | | eslint-plugin-qwik | Patch | | @builder.io/qwik | Patch | | create-qwik | Patch |

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[pkg-pr-new[bot]]

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npm i https://pkg.pr.new/@builder.io/qwik@7082

npm i https://pkg.pr.new/@builder.io/qwik-city@7082

npm i https://pkg.pr.new/eslint-plugin-qwik@7082

npm i https://pkg.pr.new/create-qwik@7082

commit: b5a0660

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