Add kde patches

The nixpkgs patch is to clear out a conflict with a patch that's applied
to plasma-workspace by nixpkgs

roles/kde/patches/kwin/pr7823.patch

@@ -0,0 +1,26 @@
+From a1868942fbc2ad5de4c053dd17335dff34d81779 Mon Sep 17 00:00:00 2001
+From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
+Date: Wed, 25 Jun 2025 14:10:18 +0300
+Subject: [PATCH] plugins/login: Reduce animation duration
+
+This makes the startup feel a bit faster.
+---
+ src/plugins/login/package/contents/code/main.js | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/plugins/login/package/contents/code/main.js b/src/plugins/login/package/contents/code/main.js
+index 7f849a6e2e6..e3ad0b76c07 100644
+--- a/src/plugins/login/package/contents/code/main.js
++++ b/src/plugins/login/package/contents/code/main.js
+@@ -11,7 +11,7 @@
+ "use strict";
+ 
+ var loginEffect = {
+-    duration: animationTime(1000),
++    duration: animationTime(500),
+     isFadeToBlack: false,
+     loadConfig: function () {
+         loginEffect.isFadeToBlack = effect.readConfig("FadeToBlack", false);
+-- 
+GitLab
+