feat(client_web): checkers slide animation

client_web/Cargo.toml

@@ -17,9 +17,17 @@ serde_json      = "1"
 futures         = "0.3"
 rand            = "0.9"
 gloo-storage    = "0.3"
+gloo-timers     = "0.3"
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 wasm-bindgen-futures = "0.4"
 # getrandom 0.3 requires an explicit WASM backend; "wasm_js" uses window.crypto.getRandomValues.
 # Must be a direct dependency (not just transitive) for the feature to take effect.
 getrandom = { version = "0.3", features = ["wasm_js"] }
+web-sys = { version = "0.3", features = [
+    "Document",
+    "Element",
+    "HtmlElement",
+    "CssStyleDeclaration",
+    "DomTokenList",
+] }