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/tests/balance.rs

@@ -1,17 +1,20 @@
-use evm_client::provider::Transaction;
-use evm_client::provider::{parse_signature_rs_v, get_balance};
-use ethers_core::types::{Address, U256};
+// This file contains native-only integration tests for EVM client balance and signing logic.
+// All code is strictly separated from WASM code using cfg attributes.
 
 #[cfg(not(target_arch = "wasm32"))]
 mod native_tests {
-    use super::*;
     use vault::{SessionManager, KeyType};
     use tempfile::TempDir;
     use kvstore::native::NativeStore;
     use alloy_primitives::keccak256;
+    
+
 
     #[tokio::test]
     async fn test_vault_sessionmanager_balance_for_new_keypair() {
+        use ethers_core::types::{Address, U256};
+        use evm_client::provider::get_balance;
+
         let tmp_dir = TempDir::new().expect("create temp dir");
         let store = NativeStore::open(tmp_dir.path().to_str().unwrap()).expect("Failed to open native store");
         let mut vault = vault::Vault::new(store.clone());
@@ -40,11 +43,13 @@ mod native_tests {
     }
 }
 
-
-use ethers_core::types::Bytes;
+    use ethers_core::types::Bytes;
 
 #[test]
-fn test_rlp_encode_unsigned() {
+    fn test_rlp_encode_unsigned() {
+        use ethers_core::types::{Address, U256, Bytes};
+        use evm_client::provider::Transaction;
+
     let tx = Transaction {
         nonce: U256::from(1),
         to: Address::zero(),
@@ -59,7 +64,10 @@ fn test_rlp_encode_unsigned() {
 }
 
 #[test]
-fn test_parse_signature_rs_v() {
+    fn test_parse_signature_rs_v() {
+        use ethers_core::types::U256;
+        use evm_client::provider::parse_signature_rs_v;
+
     let mut sig = [0u8; 65];
     sig[31] = 1; sig[63] = 2; sig[64] = 27;
     let (r, s, v) = parse_signature_rs_v(&sig, 1).unwrap();
@@ -70,7 +78,10 @@ fn test_parse_signature_rs_v() {
 
 #[cfg(not(target_arch = "wasm32"))]
 #[tokio::test]
-async fn test_get_balance_real_address() {
+    async fn test_get_balance_real_address() {
+        use ethers_core::types::{Address, U256};
+        use evm_client::provider::get_balance;
+
     // Vitalik's address
     let address = "d8dA6BF26964aF9D7eEd9e03E53415D37aA96045";
     let address = ethers_core::types::Address::from_slice(&hex::decode(address).unwrap());

evm_client/tests/wasm.rs

@@ -1,3 +1,5 @@
+// This file contains WASM-only integration tests for EVM client balance and signing logic.
+// All code is strictly separated from native using cfg attributes.
 #![cfg(target_arch = "wasm32")]
 use wasm_bindgen_test::*;
 wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);