feat(modules): hardware modules — intel/amd/nvidia/audio/bluetooth/touchpad

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

modules/hardware/touchpad.nix

@@ -0,0 +1,59 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  inherit (lib) mkEnableOption mkIf;
+in
+{
+  options.hardware.touchpad.enable = mkEnableOption "Enhanced touchpad support";
+
+  config = mkIf config.hardware.touchpad.enable {
+    # Touchpad support via libinput
+    services.libinput = {
+      enable = true;
+      touchpad = {
+        tapping = true;
+        tappingDragLock = true;
+        naturalScrolling = true;
+        scrollMethod = "twofinger";
+        disableWhileTyping = true;
+        middleEmulation = true;
+        accelProfile = "adaptive";
+      };
+    };
+
+    # Synaptics touchpad (alternative, disabled by default)
+    services.xserver.synaptics = {
+      enable = false;
+      twoFingerScroll = true;
+      palmDetect = true;
+      tapButtons = true;
+      buttonsMap = [
+        1
+        3
+        2
+      ];
+      fingersMap = [
+        0
+        0
+        0
+      ];
+    };
+
+    # Touchpad packages
+    environment.systemPackages = with pkgs; [
+      libinput
+      xinput
+      xorg.xf86inputlibinput
+    ];
+
+    # Touchpad gesture support
+    services.touchegg = {
+      enable = false; # Disabled by default, enable if needed
+    };
+  };
+}