refactor: remove jQuery from email-handler (@Leonabcd123)

[Leonabcd123]

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[Copilot]

Pull request overview

This pull request refactors the email-handler HTML file to remove the jQuery dependency and replace it with native DOM utility functions from the project's custom dom.ts utility module. The refactoring also includes minor adjustments to other files for consistency.

Key changes:

• Removed jQuery import and replaced with custom DOM utilities (qs, onDOMReady)
• Converted all jQuery selectors and method calls to use the ElementWithUtils API
• Simplified the DOMContentLoaded event listener setup using the onDOMReady helper

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
frontend/src/ts/utils/dom.ts	Added documentation comment for the scrollIntoView method
frontend/src/ts/pages/profile-search.ts	Replaced custom dispatch("focus") call with native focus() method
frontend/src/email-handler.html	Removed jQuery dependency and replaced all jQuery calls with custom DOM utility methods (qs, setHtml, setText, show, hide, getValue, appendHtml, on, focus, onDOMReady)

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