test(wallpaper): catch the daemon query/restore hang in awww/swww

[Delcado19]

Summary

• Reproduces (with a daemon stub that never returns) the hang in wallpaper.awww.sh/wallpaper.swww.sh when the awww/swww daemon is running but unresponsive: the health-check (<backend> query, then <backend> restore after a restart) runs as a plain foreground call with no bound, unlike the apply command it precedes.
• Static-checks that every query/restore call in both backends stays wrapped in timeout.
• Companion to the HyDE-side fix (opened as a separate PR against HyDE-Project/HyDE).

Test plan

• New test_wallpaper_backend_query_hang case added to the suite

[coderabbitai]

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