add web-sys as a direct dependency

Needed for localStorage, FileReader and Blob download in the client.
The features were already enabled transitively by leptos-use; this
makes the dependency explicit.

Cargo.lock

@@ -258,6 +258,7 @@ dependencies = [
  "serde_json",
  "thiserror 2.0.19",
  "wasm-bindgen",
+ "web-sys",
 ]
 
 [[package]]

Cargo.toml

@@ -32,6 +32,7 @@ console_log = "1.0.0"
 num-traits = "0.2.19"
 num-format = "0.4.4"
 js-sys = "=0.3.103"
+web-sys = "=0.3.103"
 seq-macro = "0.3.6"