fix(taskfile): make android:setup idempotent

Check if NDK directory exists before running sdkmanager to avoid
SIGPIPE (exit 141) when NDK is already installed.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: pythoninthegrass

taskfiles/android.yml

@@ -37,8 +37,13 @@ tasks:
           brew list "$pkg" &>/dev/null || brew install "$pkg"
         done
       - |
-        echo "Installing Android NDK..."
-        yes | sdkmanager --install "ndk;28.2.13676358"
+        NDK_DIR="{{.ANDROID_HOME}}/ndk/28.2.13676358"
+        if [ -d "$NDK_DIR" ]; then
+          echo "Android NDK already installed at $NDK_DIR"
+        else
+          echo "Installing Android NDK..."
+          yes | sdkmanager --install "ndk;28.2.13676358"
+        fi
       - |
         echo "Adding Android Rust targets..."
         rustup target add {{.ANDROID_ARM64_TARGET}} {{.ANDROID_ARMV7_TARGET}} {{.ANDROID_X86_TARGET}} {{.ANDROID_X64_TARGET}}