Show message after asynchronous requests for expired sessions with option to retry

[Phocacius]

only works when using the latest mapbender (>= 4.2.5)

when the session expires, login in another window and then click on retry to make sure no changes are lost.

[Copilot]

Pull request overview

This PR adds session-expiration handling for asynchronous requests by leveraging Mapbender.handleAjaxError (Mapbender >= 4.2.5) and introduces a retry hook so users can re-authenticate in another tab and retry operations without losing changes.

Changes:

• Refactor grants loading into _loadGrants and add an overridable onGrantsLoadStarted hook.
• Extend request helpers (postJSON, item fetch) to use Mapbender.handleAjaxError with a retry callback when available.
• Update Digitizer initialization to wait for “map ready + grants loaded” via the new hook.

Reviewed changes

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

File	Description
src/Mapbender/DigitizerBundle/Resources/public/mapbender.element.digitizer.js	Switches Digitizer setup/start to the new grants-loading hook and updates a postJSON call to use the new callback pattern.
src/Mapbender/DataManagerBundle/Resources/public/dataManager.element.js	Adds retry-aware grants loading and AJAX helpers; changes postJSON signature to accept an optional success callback.
CHANGELOG.md	Documents the new session-expiration / retry behavior.

Comments suppressed due to low confidence (1)

src/Mapbender/DataManagerBundle/Resources/public/dataManager.element.js:1

• Same retry-chaining issue as in _loadGrants: if the first request fails, the returned promise is rejected and stays rejected even if the user retries and the retried request succeeds. This can break caller flows that rely on the returned promise (e.g., closing dialogs, resuming tool state, subsequent .then(...) chains). Consider implementing the retry handling by returning the retried promise from the failure handler so the original call completes successfully after retry.

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