About/details panel configured to show at startup does not appear consistently when map is loaded in a context #12441

[rowheat02]

Description

The About panel sometimes did not open on startup, even when “Show at startup” was enabled, because the open action could run before the Details plugin was ready during slow context loading.

This PR now retry the startup open after the Details plugin is registered, and only open it if the map has details, “Show at startup” is enabled, and the panel is not already open.

To test the throttle to 3G and test the context map with “Show at startup” enabled.

Screen.Recording.2026-06-03.at.13.37.49-compressed.mp4

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• Bugfix

Issue

What is the current behavior?

#12441

What is the new behavior?

So the About panel will be opened regarless of the network speed when “Show at startup” is enabled

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• Yes, and I documented them in migration notes
• No

Other useful information

[offtherailz]

This is a workaround that duplicates what happens in config.js .
This looks to trigger an "openDetailsPanel" from a "REDUCERS_LOADED" to re-trigger the event in case the reducer was not set...

I think we should extract instead details management from config.js in order to handle all or part of the openDetailsPanel triggering (and conflict resolution with tutorial ) inside the main epic dedicated to this.
Let's separate the concerns