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rfd's Linux backend goes through the XDG desktop portal, and a blocking
`rfd::FileDialog` leaves the main thread waiting on the portal's answer
without pumping winit's events: while the Open dialog is up the window stops
answering the compositor, which offers to force-quit the app ("EffectCraft is
not responding"), until a file is picked.
The non-blocking host hook for the commands' dialogs (`rfd::AsyncFileDialog`
on a worker thread, run when the dialog closes) was macOS-only since #511.
Install it on Linux too. Windows keeps the blocking pickers (its dialog pumps
its own messages), and the panel buttons' pickers (Settings, effect file
pickers) are unchanged.
Checked headlessly against a mock XDG portal: with the hook the main thread
stays in the event loop while a worker blocks in the portal wait, `ui.inspect`
still answers 7.5 s after the dialog opened, and an answered dialog runs
File ▸ Import; without it the main thread itself blocks in the portal wait and
the app answers nothing until the dialog closes.
Co-Authored-By: DeepSeek V4.1 Flash Free <noreply@deepseek.com>