dailz 55abb5e56d fix(backend_detect): use raw zbus for portal check to avoid OnceLock connection poisoning ...

ashpd caches zbus::Connection in a global OnceLock. When check_portal_available()
created a Screencast proxy, the connection was cached there. When the function
returned and its tokio Runtime dropped, the cached connection became dead.
Subsequent setup_portal() calls reused this dead connection and hung forever.

Fix: replace ashpd Screencast proxy with direct zbus D-Bus interface check,
which does not touch the ashpd global connection cache.

Add examples/test_portal.rs for minimal Portal ScreenCast testing.

2026-05-27 22:07:11 +08:00

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