Add a few macOS software

modules/syncthing.nix

@@ -0,0 +1,29 @@
+{ config, pkgs, lib, ... }:
+
+{
+  # Enable Syncthing service
+  services.syncthing = {
+    enable = true;
+    # Don't enable tray on macOS as it requires additional setup
+    tray.enable = false;
+  };
+  
+  # Copy existing Syncthing configuration to preserve device ID and settings
+  home.activation.syncthingConfig = lib.hm.dag.entryAfter ["writeBoundary"] ''
+    # Create syncthing config directory if it doesn't exist
+    mkdir -p "$HOME/.config/syncthing"
+    
+    # Copy configuration from macOS location if not already present
+    if [ ! -e "$HOME/.config/syncthing/config.xml" ]; then
+      echo "Migrating Syncthing configuration from macOS location..."
+      if [ -d "$HOME/Library/Application Support/Syncthing" ]; then
+        cp -r "$HOME/Library/Application Support/Syncthing/"* "$HOME/.config/syncthing/"
+        echo "Syncthing configuration migrated successfully!"
+      else
+        echo "Warning: No existing Syncthing configuration found to migrate"
+      fi
+    else
+      echo "Syncthing configuration already exists at ~/.config/syncthing"
+    fi
+  '';
+}