Fix Linux build: enable ksni feature for tray-item and add libdbus-1-dev to CI

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/ci.yml

@@ -13,6 +13,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Install system dependencies (Linux)
+        if: runner.os == 'Linux'
+        run: sudo apt-get update && sudo apt-get install -y libdbus-1-dev pkg-config
+
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@stable
 

.github/workflows/release.yml

@@ -43,7 +43,7 @@ jobs:
 
       - name: Install system dependencies (Linux)
         if: runner.os == 'Linux'
-        run: sudo apt-get update && sudo apt-get install -y cmake
+        run: sudo apt-get update && sudo apt-get install -y cmake libdbus-1-dev pkg-config
 
       - name: Install Node.js
         uses: actions/setup-node@v4

backend/Cargo.toml

@@ -51,6 +51,10 @@ tokio-util = { version = "0.7", features = ["io"] }
 # System tray (production mode)
 tray-item = "0.10"
 
+# Linux: tray-item needs ksni feature (pure-Rust D-Bus StatusNotifierItem)
+[target.'cfg(target_os = "linux")'.dependencies]
+tray-item = { version = "0.10", features = ["ksni"] }
+
 # Windows icon loading (for tray icon)
 [target.'cfg(target_os = "windows")'.dependencies]
 windows-sys = { version = "0.52", features = ["Win32_UI_WindowsAndMessaging", "Win32_System_LibraryLoader"] }