Fix hydration error suspense (#4640)

* Fix hydration of error boundaries

* add a regression test

* add more comments

* fix typos

* more typos

* fix clippy

packages/playwright-tests/fullstack-errors/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "dioxus-playwright-fullstack-errors-test"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+dioxus = { workspace = true, features = ["fullstack"] }
+serde = "1.0.219"
+tokio = { workspace = true, features = ["full"], optional = true }
+
+[features]
+default = []
+server = ["dioxus/server", "dep:tokio"]
+web = ["dioxus/web"]