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3f77c07875
MultipleImageStrategy::update() and handleClick() ran util::command::exec (a blocking fork+exec+read) on the GTK main thread, so the whole bar froze for the script's duration on every interval and on every click. Move the exec into a new IStrategy::fetch() hook that the SleeperThread worker runs before dp.emit(); update() now only parses the cached output and draws on the main thread (mirroring how custom.cpp separates exec from formatting). handleClick() uses forkExec() so clicks fire-and-forget instead of blocking on the command's output. The entries and single-image paths are unchanged.