rebase to unstable

update lock (12/15/2025)

system/all.nix

@@ -138,7 +138,7 @@
 
   programs.niri = {
     enable = true;
-    package = pkgs.niri-stable.overrideAttrs (old: {
+    package = pkgs.niri-unstable.overrideAttrs (old: {
       doCheck = false;
     });
   };

system/hosts/peach/default.nix

@@ -15,6 +15,24 @@
 
   boot.kernelParams = [ "apple_dcp.show_notch=1" ];
 
+  # fixes a regression that crashes firefox by upgrading
+  # from 25.3.1 to 25.3.2 (very unstable)
+  # https://github.com/nix-community/nixos-apple-silicon/issues/380
+  nixpkgs.overlays = [
+    (final: prev: {
+      mesa = prev.mesa.overrideAttrs (oldAttrs: {
+        version = "25.3.2";
+        src = prev.fetchFromGitLab {
+          domain = "gitlab.freedesktop.org";
+          owner = "mesa";
+          repo = "mesa";
+          rev = "11000ba6afe0f32cbeed45d4db3c65ff51487dec";
+          hash = "sha256-YZg17uATScPwjUEEMEuY3NFNdpMdOOYbD6Zoh5psl6I=";
+        };
+      });
+    })
+  ];
+
   catppuccin.accent = "peach";
 
   home-manager.users.sckova = {
@@ -35,15 +53,6 @@
     };
   };
 
-  # hardware.graphics.package =
-  #   # Workaround for Mesa 25.3.0 regression
-  #   # https://github.com/nix-community/nixos-apple-silicon/issues/380
-  #   assert pkgs.mesa.version == "25.3.0";
-  #   (import (fetchTarball {
-  #     url = "https://github.com/NixOS/nixpkgs/archive/c5ae371f1a6a7fd27823bc500d9390b38c05fa55.tar.gz";
-  #     sha256 = "sha256-4PqRErxfe+2toFJFgcRKZ0UI9NSIOJa+7RXVtBhy4KE=";
-  #   }) { localSystem = pkgs.stdenv.hostPlatform; }).mesa;
-
   swapDevices = [
     {
       device = "/swapfile";