add computed hook

packages/hooks/Cargo.toml

@@ -19,6 +19,7 @@ futures-channel = { workspace = true }
 log = { workspace = true }
 thiserror = { workspace = true }
 debug-cell = { git = "https://github.com/Niedzwiedzw/debug-cell", rev = "3352a1f8aff19f56f5e3b2018200a3338fd43d2e" } # waiting for the merge / official DioxusLabs fork
+slab.workspace = true
 
 [dev-dependencies]
 futures-util = { workspace = true, default-features = false }