Housekeeping: build deps in wrong section, orphan debug file, placeholder Cargo metadata

[codehakase]

Description

A few small housekeeping items:

1. Build-only packages listed in dependencies instead of devDependencies

In package.json, the following are only needed at build time but are in dependencies:

• @types/react, @types/react-dom
• typescript
• @vitejs/plugin-react
• vite

2. Orphan debug_test.rs file

src-tauri/debug_test.rs is a standalone file that isn't part of any build target or test harness. It appears to be a one-off debug script that should be removed or moved to an integration test.

3. Placeholder Cargo.toml metadata

src-tauri/Cargo.toml still has:

description = "A Tauri App"
authors = ["you"]

These should reflect the actual project.