[desktop] Add rust-dark-light as direct dependency

desktop/tauri/rust-dark-light/README.md

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+# rust-dark-light
+
+Rust crate to detect if dark mode or light mode is enabled. Supports macOS, Windows, Linux, BSDs, and WASM. On Linux and BSDs, first the XDG Desktop Portal dbus API is checked for the `color-scheme` preference, which works in Flatpak sandboxes without needing filesystem access. If that does not work, fallback methods are used for KDE, GNOME, Cinnamon, MATE, XFCE, and Unity.
+
+[API Documentation](https://docs.rs/dark-light/)
+
+## Usage
+
+```rust
+fn main() {
+    let mode = dark_light::detect();
+
+    match mode {
+        // Dark mode
+        dark_light::Mode::Dark => {},
+        // Light mode
+        dark_light::Mode::Light => {},
+        // Unspecified
+        dark_light::Mode::Default => {},
+    }
+}
+```
+
+## Example
+
+```
+cargo run --example detect
+```
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+