Fix config upgrade failures, save races, lock confirmation and release validation (#23)

* Coordinate config writes and gate releases on desktop validation

* Use toolkit rc.2 with painting and session lock fixes

* Ignore retired desktop widget settings in existing configs

crates/ferese-theme/Cargo.toml

@@ -11,7 +11,7 @@ ferese-theme-model = { path = "../ferese-theme-model" }
 ferese-config = { path = "../ferese-config" }
 libcosmic = { workspace = true, features = ["a11y"] }
 
-iced_accessibility = { git = "https://github.com/ferese-wm/libcosmic", tag = "ferese-v0.1.3-rc.1" }
+iced_accessibility.workspace = true
 
 [dev-dependencies]
 tokio = { version = "1", features = ["rt"] }