Interactive task type

[ilicfilip]

Context

Implementation of https://github.com/ProgressPlanner/progress-planner-pro/issues/86

This PR adds example of interactive task, when clicking on a task user gets a popover which let him tests if sending emails is working on his site. If user confirms that sending email is working task will be celebrated, if not user gets an instruction on how to fix it.

Technically, idea is to add interactive part as a custom web component so we can change it any way we want without touching the rest of the code base.

The PHP class for this task type should also contain all relevant code, in this case it is a AJAX callback which sends an email.

Summary

Added task for checking if sending emails is working.

Quality assurance

• I have tested this code to the best of my abilities.
• I have added unit tests to verify the code works as intended.
• I have checked that the base branch is correctly set.

[github-actions]

Test on Playground
Test this pull request on the Playground or download the zip.

[ilicfilip]

@Mijke , @tacoverdo here is the screen recording of the current state of the Interactive task (checking if email sending is working):

Screen.Recording.2025-04-17.at.15.12.55.mov