feat: Add WASM support and browser extension infrastructure

- Add WASM build target and dependencies for all crates.
- Implement IndexedDB-based persistent storage for WASM.
- Create browser extension infrastructure (UI, scripting, etc.).
- Integrate Rhai scripting engine for secure automation.
- Implement user stories and documentation for the extension.

evm_client/Cargo.toml

@@ -7,6 +7,9 @@ edition = "2021"
 path = "src/lib.rs"
 
 [dependencies]
+kvstore = { path = "../kvstore" }
+tokio = { version = "1.37", features = ["rt", "macros"] }
+rhai = "1.16"
 ethers-core = "2.0"
 gloo-net = { version = "0.5", features = ["http"] }
 rlp = "0.5"
@@ -23,10 +26,16 @@ hex = "0.4"
 k256 = { version = "0.13", features = ["ecdsa"] }
 
 [dev-dependencies]
+tempfile = "3.10"
 wasm-bindgen-test = "0.3"
 web-sys = { version = "0.3", features = ["console"] }
-tempfile = "3"
-kvstore = { path = "../kvstore" }
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+getrandom = { version = "0.3", features = ["wasm_js"] }
+getrandom_02 = { package = "getrandom", version = "0.2", features = ["js"] }
+wasm-bindgen = "0.2"
+js-sys = "0.3"
+console_error_panic_hook = "0.1"
 
 [target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
 tokio = { version = "1", features = ["macros", "rt-multi-thread"] }