Fix: Sidebar group should toggle open/close on click (#5263)

[Harshit-0413]

Problem

In the instance sidebar, once a group (e.g., "Web") is expanded, clicking it again does not collapse it.

Root Cause

The toggle logic did not correctly reset the open group state when the same group was clicked again.

Solution

Updated the toggle logic to properly toggle between open and closed states.

Notes

• Fixed ESLint issues
• Minimal and focused change

[cdprete]

To my understanding, too many things have been changed/removed which are unrelated to the bug itself.

Moreover, if I'm right about https://github.com/codecentric/spring-boot-admin/pull/5267/changes#r3095328671, @SteKoe already knows I would open a regression bug if that feature disappears with no real reason ;)

[SteKoe]

Please rebase your branch correctly as it contains backend changes that are not related to frontend (obviously).

[cdprete]

Please rebase your branch correctly as it contains backend changes that are not related to frontend (obviously).

Yeah, I wanted to suggest the same, but then I saw there were merge commits added by you and @ulischulte, so I was not sure anymore who the culprit was. 😅

[SteKoe]

I just rebased and extended the implementation to work as stated in PR description:

• When you navigate to a view, the sidebar automatically opens the group that contains the current page.
• Clicking the toggle button on the currently open group collapses that group.
• Clicking the toggle button on a different group opens that group instead.
• Opening a different group closes the previously open one, so only one group is expanded at a time.
• Changing the route resets the open state to the group of the newly navigated page.

[cdprete]

Opening a different group closes the previously open one, so only one group is expanded at a time

Without changing the view, right? (aka: no $router.push(...) or so unless an entry in the group is clicked)

[SteKoe]

Without changing the view, right? (aka: no $router.push(...) or so unless an entry in the group is clicked)

yeah, right!