chore: update build config, linting, and add test infrastructure

Replace install -D with mkdir -p + install for macOS portability,
add vitest with jsdom and testing-library, configure eslint for
react-hooks v7 warnings, and add tokio test deps for Rust.

src-tauri/Cargo.toml

@@ -35,3 +35,6 @@ rmcp = { version = "0.15", features = ["server", "macros", "transport-streamable
 axum = "0.8"
 schemars = "1"
 tokio-util = "0.7"
+
+[dev-dependencies]
+tokio = { version = "1", features = ["rt", "macros"] }

src-tauri/build.rs

@@ -1,3 +1,3 @@
 fn main() {
-  tauri_build::build()
+    tauri_build::build()
 }