Class code after change password

[180079995]

This pull request updates the src/routes/profile/change-password/+page.svelte file to enhance user experience by introducing logic to handle a classCode for navigation and improve user context during the password change process.

Enhancements to user experience:

• Added onMount logic to retrieve and process classCode: The onMount lifecycle function now fetches the user's profile using the getUser utility and extracts a classCode from the user's email domain if available. ([src/routes/profile/change-password/+page.svelteR6-R24](https://github.com/hinagiku-dev/Hinagiku/pull/298/files#diff-2ed60c2b9a8230da8752f8357bea68163cc9ac7af001e10afc8b908481fa0260R6-R24))
• Updated navigation logic after password change: If a classCode is present, it is converted to uppercase and appended as a query parameter to the /login route for improved contextual navigation. ([src/routes/profile/change-password/+page.svelteR57-R60](https://github.com/hinagiku-dev/Hinagiku/pull/298/files#diff-2ed60c2b9a8230da8752f8357bea68163cc9ac7af001e10afc8b908481fa0260R57-R60))

[Copilot]

Pull Request Overview

This PR updates the change password page to enhance user experience by introducing logic to extract a classCode from the user's email and incorporate it into navigation post-password change.

• Added an onMount hook to retrieve the user's profile and extract a classCode from their email.
• Updated the post-password change navigation logic to conditionally append the classCode as a query parameter.