fix(funbox): skip wikipedia section fetch when leaving the test page (@henrikhhag)

[henrikhhag]

Problem: every time you leave the test page, the app runs a background-restart of the test, and if the wikipedia-funbox is active, then the restart makes a unnecessary network call to Wikipedia in the background. And if that call fails, then the global loading indicator will just stand there without anyone seeing why.

#8032
From the issue #8032, in comments section, @Leonabcd123 traces the issue directly to the afterHide-hook

The fix is to make a new flag (skipFunboxSection) that lets this specific background-restart jump over the network, while normal use of test page is unchanged.

For testing I wrote a Vitest-test that confirms the network call doesn't happen with the flag, and continues without it. Also ran the full frontend test suite (1047 tests) to check for regressions — all passing.

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Closes #8032