chore: Update system flake inputs

overlays/modifications/default.nix

@@ -16,6 +16,9 @@ in
       ./vim.nix
       ./prismlauncher.nix
 
+      ./fix-ffmpeg_7-full.nix
+      ./fix-kdePackages.kdenlive.nix
+
       # Nur
       ./nur.nix
     ]

overlays/modifications/fix-ffmpeg_7-full.nix

@@ -0,0 +1,14 @@
+{inputs, ...}: _final: prev: let
+  inherit (prev.stdenv.hostPlatform) system;
+  pkgs = import inputs.nixpkgs-485356 {
+    localSystem = {
+      inherit system;
+    };
+    config = {
+      allowUnfree = true;
+      cudaSupport = true;
+    };
+  };
+in {
+  ffmpeg_7-full = pkgs.ffmpeg_7-full;
+}

overlays/modifications/fix-kdePackages.kdenlive.nix

@@ -0,0 +1,9 @@
+{...}: final: prev: {
+  kdePackages =
+    prev.kdePackages
+    // {
+      kdenlive = prev.kdePackages.kdenlive.override {
+        ffmpeg-full = final.ffmpeg_7-full;
+      };
+    };
+}