fix(ci): install libkeybinder for Linux hotkey plugin builds

Add libkeybinder-3.0-dev to Linux dependency installation in both release and CI workflows.

Reason:
- hotkey_manager_linux requires keybinder-3.0 headers/libraries at configure time
- release workflow failed at Linux build step with CMake error about missing keybinder

Author: insign

.github/workflows/ci.yml

@@ -97,7 +97,7 @@ jobs:
       - name: Install Linux dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install -y clang cmake ninja-build pkg-config libgtk-3-dev liblzma-dev libstdc++-12-dev libsecret-1-dev libayatana-appindicator3-dev
+          sudo apt-get install -y clang cmake ninja-build pkg-config libgtk-3-dev liblzma-dev libstdc++-12-dev libsecret-1-dev libayatana-appindicator3-dev libkeybinder-3.0-dev
 
       - name: Build Linux GUI
         run: flutter build linux --release

.github/workflows/release.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Install Linux dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install -y clang cmake ninja-build pkg-config libgtk-3-dev liblzma-dev libstdc++-12-dev libsecret-1-dev libayatana-appindicator3-dev
+          sudo apt-get install -y clang cmake ninja-build pkg-config libgtk-3-dev liblzma-dev libstdc++-12-dev libsecret-1-dev libayatana-appindicator3-dev libkeybinder-3.0-dev
 
       - name: Cache Pub dependencies
         uses: actions/cache@v4