Enable transparent macOS window and UI tweaks

Enable macOS private API and make the app window transparent. Add tauri feature and tauri.conf settings (macOSPrivateApi + transparent) and call set_background_color in setup to use an RGBA transparent background. Adjust CSS so body is transparent, add --radius-window, and move app background to #app/.layout with border-radius and overflow hidden to preserve rounded transparent window styling.

src-tauri/Cargo.toml

@@ -18,7 +18,7 @@ crate-type = ["staticlib", "cdylib", "rlib"]
 tauri-build = { version = "2", features = [] }
 
 [dependencies]
-tauri = { version = "2", features = [] }
+tauri = { version = "2", features = ["macos-private-api"] }
 tauri-plugin-opener = "2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"

src-tauri/src/lib.rs

@@ -1832,6 +1832,14 @@ pub fn run() {
     tauri::Builder::default()
         .plugin(tauri_plugin_dialog::init())
         .plugin(tauri_plugin_opener::init())
+        .setup(|app| {
+            use tauri::Manager;
+            if let Some(window) = app.get_webview_window("main") {
+                let _ = window
+                    .set_background_color(Some(tauri::utils::config::Color(0, 0, 0, 0)));
+            }
+            Ok(())
+        })
         .invoke_handler(tauri::generate_handler![
             git_clone,
             git_pull,

src-tauri/tauri.conf.json

@@ -8,6 +8,7 @@
   },
   "app": {
     "withGlobalTauri": true,
+    "macOSPrivateApi": true,
     "windows": [
       {
         "title": "Gitpub Desktop",
@@ -15,7 +16,8 @@
         "height": 860,
         "minWidth": 1024,
         "minHeight": 680,
-        "decorations": false
+        "decorations": false,
+        "transparent": true
       }
     ],
     "security": {