tools: add sync-version.js to sync package.json -> Tauri files

- Add tools/sync-version.js script to read root package.json version
  and update src-tauri/tauri.conf.json and src-tauri/Cargo.toml.
- Update only the [package] version line in Cargo.toml to preserve formatting.
- Include JSON read/write helpers and basic error handling/reporting.

README.md

@@ -36,7 +36,13 @@ Before you begin, ensure you have the following installed on your machine:
 To start the application in development mode (with hot-reloading for frontend changes):
 
 ```bash
-npm run tauri dev
+npm run dev
+```
+
+If you want FFmpeg to be bundled into `src-tauri/resources/` for local/native playback during dev, use:
+
+```bash
+npm run dev:native
 ```
 
 This command will:
@@ -50,7 +56,7 @@ To create an optimized, standalone executable for your operating system:
 
 1.  **Run the build command**:
     ```bash
-    npm run tauri build
+  npm run build
     ```
 
 2.  **Locate the artifacts**:
@@ -67,7 +73,9 @@ To create an optimized, standalone executable for your operating system:
     *   `styles.css`: Application styling.
     *   `stations.json`: Configuration file for available radio streams.
 *   **`src-tauri/`**: Rust backend code.
-    *   `src/main.rs`: The entry point for the Rust process. Handles Google Cast discovery and playback logic.
+  *   `src/lib.rs`: Tauri command layer (native player commands, Cast commands, utility HTTP helpers).
+  *   `src/player.rs`: Native audio engine (FFmpeg decode → PCM ring buffer → CPAL output).
+  *   `src/main.rs`: Rust entry point (wires the Tauri app; most command logic lives in `lib.rs`).
     *   `tauri.conf.json`: Configuration for the Tauri app (window size, permissions, package info).
 
 ## Customization