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.

vault/Cargo.toml

@@ -7,6 +7,8 @@ edition = "2021"
 path = "src/lib.rs"
 
 [dependencies]
+once_cell = "1.18"
+tokio = { version = "1.37", features = ["rt", "macros"] }
 kvstore = { path = "../kvstore" }
 scrypt = "0.11"
 sha2 = "0.10"
@@ -26,18 +28,21 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1.0"
 hex = "0.4"
 zeroize = "1.8.1"
+rhai = "1.21.0"
 
 [dev-dependencies]
-tempfile = "3.10"
+wasm-bindgen-test = "0.3"
 console_error_panic_hook = "0.1"
+
+[target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
+tempfile = "3.10"
 tokio = { version = "1.0", features = ["rt", "macros"] }
 async-std = { version = "1", features = ["attributes"] }
-wasm-bindgen-test = "0.3"
 chrono = "0.4"
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
-getrandom = { version = "0.2", features = ["js"] }
+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"
-