feat(renovate): update schedules to Saturday afternoon

- lockFileMaintenance: Saturday 2-4pm (was Monday 5am)
- nix-stable-ecosystem: Saturday 2-4pm
- nix-unstable-ecosystem: Saturday 2-4pm
- Add nixpkgs-qt rule: Saturday 4-6pm (staggered)

This allows CI builds to run overnight Saturday→Sunday, with human
review Saturday evening and builds complete by Sunday morning.

Closes: x-ymkgu

flake.lock

@@ -258,22 +258,6 @@
         "type": "github"
       }
     },
-    "nixpkgs-qt": {
-      "locked": {
-        "lastModified": 1770464364,
-        "narHash": "sha256-z5NJPSBwsLf/OfD8WTmh79tlSU8XgIbwmk6qB1/TFzY=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "23d72dabcb3b12469f57b37170fcbc1789bd7457",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nixos",
-        "ref": "nixos-25.11",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
     "nixpkgs-unstable": {
       "locked": {
         "lastModified": 1769170682,
@@ -363,7 +347,6 @@
         "nix-darwin": "nix-darwin",
         "nix-doom-emacs-unstraightened": "nix-doom-emacs-unstraightened",
         "nixpkgs": "nixpkgs",
-        "nixpkgs-qt": "nixpkgs-qt",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "perles": "perles",
         "plasma-manager": "plasma-manager",

flake.nix

@@ -4,9 +4,6 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
     nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
-    # Separate nixpkgs for qt5webengine-dependent packages (jellyfin-media-player, etc.)
-    # Updates on separate Renovate schedule to avoid massive qt rebuilds
-    nixpkgs-qt.url = "github:nixos/nixpkgs/nixos-25.11";
 
     nix-darwin = {
       url = "github:nix-darwin/nix-darwin/nix-darwin-25.11";
@@ -79,11 +76,6 @@
         config.allowUnfree = true;
         overlays = unstableOverlays;
       };
-      # Separate nixpkgs for qt5webengine-heavy packages to avoid rebuild churn
-      qt-pinned = import inputs.nixpkgs-qt {
-        system = prev.stdenv.hostPlatform.system;
-        config.allowUnfree = true;
-      };
       custom = prev.callPackage ./packages {};
       # Compatibility: bitwarden renamed to bitwarden-desktop in unstable
       bitwarden-desktop = prev.bitwarden-desktop or prev.bitwarden;

renovate.json

@@ -13,7 +13,7 @@
   "lockFileMaintenance": {
     "enabled": true,
     "schedule": [
-      "before 5am on monday"
+      "after 2pm and before 4pm on Saturday"
     ]
   },
   "dependencyDashboard": true,
@@ -37,6 +37,9 @@
         "/^nixpkgs$/",
         "/^home-manager$/",
         "/^nix-darwin$/"
+      ],
+      "schedule": [
+        "after 2pm and before 4pm on Saturday"
       ]
     },
     {
@@ -48,6 +51,21 @@
       "matchPackageNames": [
         "/nixpkgs-unstable/",
         "/home-manager-unstable/"
+      ],
+      "schedule": [
+        "after 2pm and before 4pm on Saturday"
+      ]
+    },
+    {
+      "description": "nixpkgs-qt updates on Saturday (staggered from main ecosystem)",
+      "matchManagers": [
+        "nix"
+      ],
+      "matchPackageNames": [
+        "/nixpkgs-qt/"
+      ],
+      "schedule": [
+        "after 4pm and before 6pm on Saturday"
       ]
     },
     {