style(ui): redesign app layout to native macOS density and refine visual theme

- Adjusted overall layout scale to perfectly match original native macOS density.

- Refined sidebar into a floating rounded slab with proper padding, border, and toggle button placement.

- Fixed drag region overlap preventing button interactions in the title bar.

- Removed artificial shadow lines and scrollbars from the sidebar.

- Updated Tauri backend configuration, dependencies, and scheduler functions for improved stability.

apps/desktop/src-tauri/Cargo.lock

@@ -4402,7 +4402,7 @@ dependencies = [
  "url",
  "webkit2gtk",
  "webview2-com",
- "window-vibrancy",
+ "window-vibrancy 0.6.0",
  "windows 0.61.3",
 ]
 
@@ -4440,6 +4440,7 @@ dependencies = [
  "tokio",
  "tokio-tungstenite",
  "tower-http",
+ "window-vibrancy 0.7.1",
 ]
 
 [[package]]
@@ -5683,6 +5684,21 @@ dependencies = [
  "windows-version",
 ]
 
+[[package]]
+name = "window-vibrancy"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "010797bd7c40396fbc59d3105089fed0885fe267a0ef4a0a4646df54e28647f6"
+dependencies = [
+ "objc2",
+ "objc2-app-kit",
+ "objc2-core-foundation",
+ "objc2-foundation",
+ "raw-window-handle",
+ "windows-sys 0.60.2",
+ "windows-version",
+]
+
 [[package]]
 name = "windows"
 version = "0.61.3"

apps/desktop/src-tauri/Cargo.toml

@@ -18,7 +18,7 @@ crate-type = ["staticlib", "cdylib", "rlib"]
 tauri-build = { version = "2", features = [] }
 
 [dependencies]
-tauri = { version = "2", features = ["tray-icon", "image-png"] }
+tauri = { version = "2", features = ["macos-private-api", "tray-icon", "image-png"] }
 tauri-plugin-opener = "2"
 tauri-plugin-dialog = "2"
 serde = { version = "1", features = ["derive"] }
@@ -47,3 +47,4 @@ rusqlite = { version = "0.40.1", features = ["bundled"] }
 chrono = "0.4.38"
 cocoa = "0.25"
 objc = "0.2.7"
+window-vibrancy = "0.7.1"

apps/desktop/src-tauri/src/lib.rs

@@ -714,7 +714,7 @@ pub(crate) async fn start_media_download_internal(
     let spd_re = Regex::new(r"at\s+([^\s]+)").unwrap();
     let eta_re = Regex::new(r"ETA\s+([^\s]+)").unwrap();
 
-    tokio::spawn(async move {
+    tauri::async_runtime::spawn(async move {
         let _keep_alive = config_path; // Keep the temp file alive
         let mut reader = BufReader::new(stdout).lines();
         let mut current_track: f64 = 0.0;
@@ -1207,6 +1207,16 @@ pub fn run() {
 
             crate::scheduler::spawn_scheduler(app.handle().clone());
 
+            #[cfg(target_os = "macos")]
+            {
+                use tauri::Manager;
+                use window_vibrancy::{apply_vibrancy, NSVisualEffectMaterial};
+                if let Some(window) = app.get_webview_window("main") {
+                    apply_vibrancy(&window, NSVisualEffectMaterial::Sidebar, None, None)
+                        .expect("Unsupported platform! 'apply_vibrancy' is only supported on macOS");
+                }
+            }
+
             let resource_dir = app.path().resource_dir().unwrap();
             let aria2c_path = resource_dir.join("binaries").join("aria2c");
             
@@ -1233,7 +1243,7 @@ pub fn run() {
             let app_handle_clone = app.handle().clone();
             let aria2_port_clone = aria2_port;
             let aria2_secret_clone = aria2_secret.clone();
-            tokio::spawn(async move {
+            tauri::async_runtime::spawn(async move {
                 tokio::time::sleep(std::time::Duration::from_millis(500)).await;
                 let ws_url = format!("ws://127.0.0.1:{}/jsonrpc", aria2_port_clone);
                 

apps/desktop/src-tauri/src/scheduler.rs

@@ -20,7 +20,7 @@ struct SchedulerSettings {
 }
 
 pub fn spawn_scheduler(app_handle: tauri::AppHandle) {
-    tokio::spawn(async move {
+    tauri::async_runtime::spawn(async move {
         let mut interval = tokio::time::interval(Duration::from_secs(10));
         loop {
             interval.tick().await;

apps/desktop/src-tauri/tauri.conf.json

@@ -18,12 +18,14 @@
         "minWidth": 800,
         "minHeight": 600,
         "titleBarStyle": "Overlay",
-        "hiddenTitle": true
+        "hiddenTitle": true,
+        "transparent": true
       }
     ],
     "security": {
       "csp": null
-    }
+    },
+    "macOSPrivateApi": true
   },
   "bundle": {
     "active": true,