message system

[simonLeary42]

Replaces the $modalErrors functionality from groups.php with a general-purpose message system. Messages are stored in the $_SESSION so that they aren't lost on redirect. Terminology stolen from Django and style stolen from coldfront

Future work:

• send messages on uncaught exceptions
• send messages on successful POST
• make use of new pathJoin util

#327

[Copilot]

Pull request overview

This PR implements a Django-style message system to replace the previous modal-based error handling. The new system stores messages in the session and displays them at the top of pages after redirects, following the Post-Redirect-Get (PRG) pattern.

Key changes:

• Added a new message system with five severity levels (debug, info, success, warning, error) using an enum-based API
• Refactored error handling in groups.php to use the new message system instead of modal popups
• Updated the redirect() method to default to the current page when no destination is provided

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
resources/lib/UnityHTTPD.php	Adds UnityHTTPDMessageLevel enum and message storage/retrieval methods; updates redirect() signature to accept optional destination
resources/templates/header.php	Displays session messages at top of page and removes old modal message elements
webroot/panel/groups.php	Replaces $modalErrors array with new message system calls; adds redirects after error conditions
webroot/js/modal.js	Removes message parameter from openModal() function signature
webroot/css/modal.css	Removes modal message styling; minor formatting change
webroot/css/messages.css	New file with styling for message banners with different severity levels
resources/lib/utils.php	Adds pathJoin() utility function for URL path concatenation
resources/init.php	Initializes $_SESSION["messages"] array if not present
test/phpunit-bootstrap.php	Adds assertMessageExists() test helper function
test/functional/PIMemberRequestTest.php	Updates test to check for messages using new helper instead of checking $_SESSION["MODAL_ERRORS"]

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