diff --git a/.github/workflows/backport.yml b/.github/workflows/backport.yml
index 482e5b6f..aa31ee03 100644
--- a/.github/workflows/backport.yml
+++ b/.github/workflows/backport.yml
@@ -45,7 +45,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
           token: ${{ steps.app-token.outputs.token }}
 
-      - uses: korthout/backport-action@v3.4.1
+      - uses: korthout/backport-action@v4.0.1
         id: backport
         with:
           github_token: ${{ steps.app-token.outputs.token }}
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
deleted file mode 100644
index b444280a..00000000
--- a/.github/workflows/check.yml
+++ /dev/null
@@ -1,60 +0,0 @@
----
-name: Check
-
-on:
-  push:
-    branches:
-      - master
-      - release-**
-  pull_request:
-
-permissions:
-  contents: read
-
-defaults:
-  run:
-    shell: bash
-
-jobs:
-  check:
-    name: ${{ matrix.name }}
-    runs-on: ${{ matrix.runs-on }}
-
-    # https://docs.github.com/en/actions/writing-workflows/choosing-where-your-workflow-runs/choosing-the-runner-for-a-job#choosing-github-hosted-runners
-    strategy:
-      matrix:
-        include:
-          - name: aarch64-linux
-            runs-on: ubuntu-24.04-arm
-          - name: aarch64-darwin
-            runs-on: macos-15
-          - name: x86_64-linux
-            runs-on: ubuntu-24.04
-          - name: x86_64-darwin
-            runs-on: macos-15-intel
-
-    steps:
-      - uses: actions/checkout@v6
-        with:
-          persist-credentials: false
-
-      # TODO: Lock this Action to a release tag once commit [1] ("fix: relocate
-      # TMPDIR to /mnt to improve Nix installer compatibility") is part of a
-      # release, resolving [2] ("does not work with cachix install nix action").
-      #
-      # [1]: https://github.com/wimpysworld/nothing-but-nix/pull/25
-      # [2]: https://github.com/wimpysworld/nothing-but-nix/issues/24
-      - uses: wimpysworld/nothing-but-nix@10c936d9e46521bf923f75458e0cbd4fa309300d  # yamllint disable-line rule:line-length
-        if: runner.os == 'Linux'
-        with:
-          hatchet-protocol: rampage
-
-      - uses: cachix/install-nix-action@v31
-
-      - uses: cachix/cachix-action@v16
-        with:
-          name: nix-community
-          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-        continue-on-error: true
-
-      - run: nix develop --command stylix-check --no-nom
diff --git a/flake.lock b/flake.lock
index 7a8aaf94..c958f4d5 100644
--- a/flake.lock
+++ b/flake.lock
@@ -21,17 +21,17 @@
     "base16-fish": {
       "flake": false,
       "locked": {
-        "lastModified": 1754405784,
-        "narHash": "sha256-l9xHIy+85FN+bEo6yquq2IjD1rSg9fjfjpyGP1W8YXo=",
+        "lastModified": 1765809053,
+        "narHash": "sha256-XCUQLoLfBJ8saWms2HCIj4NEN+xNsWBlU1NrEPcQG4s=",
         "owner": "tomyun",
         "repo": "base16-fish",
-        "rev": "23ae20a0093dca0d7b39d76ba2401af0ccf9c561",
+        "rev": "86cbea4dca62e08fb7fd83a70e96472f92574782",
         "type": "github"
       },
       "original": {
         "owner": "tomyun",
         "repo": "base16-fish",
-        "rev": "23ae20a0093dca0d7b39d76ba2401af0ccf9c561",
+        "rev": "86cbea4dca62e08fb7fd83a70e96472f92574782",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index 0cb6d797..bd5791b7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,16 +13,13 @@
 
     # keep-sorted start block=yes newline_separated=yes
     base16-fish = {
-      # Lock the base16-fish input to a custom patch [2] ("Make autosuggestion
-      # and comment base03"), since it is currently impossible to apply patches
+      # Lock the base16-fish input to a custom patchset that cherry-picks
+      # pending patches [2], since it is currently impossible to apply patches
       # to flake inputs [1] ("Support flake references to patches").
       #
-      # Once this single-patch approach no longer scales, the repository should
-      # be properly forked, if [2] has still not been merged.
-      #
       # [1]: https://github.com/NixOS/nix/issues/3920
-      # [2]: https://github.com/tomyun/base16-fish/pull/12
-      url = "github:tomyun/base16-fish/23ae20a0093dca0d7b39d76ba2401af0ccf9c561";
+      # [2]: https://github.com/tomyun/base16-fish/pull/16
+      url = "github:tomyun/base16-fish/86cbea4dca62e08fb7fd83a70e96472f92574782";
       flake = false;
     };
 
@@ -99,6 +96,13 @@
     # keep-sorted end
   };
 
+  nixConfig = {
+    extra-substituters = [ "https://nix-community.cachix.org" ];
+    extra-trusted-public-keys = [
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+    ];
+  };
+
   outputs =
     { flake-parts, systems, ... }@inputs:
     flake-parts.lib.mkFlake { inherit inputs; } {
diff --git a/flake/dev/dev-shell.nix b/flake/dev/dev-shell.nix
index 53ff15f1..df6c4244 100644
--- a/flake/dev/dev-shell.nix
+++ b/flake/dev/dev-shell.nix
@@ -39,6 +39,8 @@
       '';
     in
     {
+      ci.buildbot = { inherit (config) devShells; };
+
       devShells = {
         default = pkgs.mkShell {
           # Install git-hooks when activating the shell
diff --git a/flake/dev/flake.lock b/flake/dev/flake.lock
index 22043fee..bf7de24a 100644
--- a/flake/dev/flake.lock
+++ b/flake/dev/flake.lock
@@ -97,11 +97,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1764736872,
-        "narHash": "sha256-4mqLegNQeD54X7enm6EI9aNWl6CaIfyhl5PaYoGYwqk=",
+        "lastModified": 1765859973,
+        "narHash": "sha256-LN5O0h9GSgcDE/sz4+sLS3CbQALru1x4lh9hrxpeHwI=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "3366918730bb6b699395a9d237397f1d710a94b3",
+        "rev": "7df150f0d3857cf68dae443813b27acfb201b2d8",
         "type": "github"
       },
       "original": {
diff --git a/flake/dev/pre-commit.nix b/flake/dev/pre-commit.nix
index a2d21568..8717ef4c 100644
--- a/flake/dev/pre-commit.nix
+++ b/flake/dev/pre-commit.nix
@@ -5,6 +5,8 @@
   perSystem =
     { config, ... }:
     {
+      ci.buildbot = { inherit (config.checks) pre-commit; };
+
       pre-commit = {
         check.enable = true;
 
diff --git a/flake/dev/public-and-dev-version-consistency.nix b/flake/dev/public-and-dev-version-consistency.nix
index 6cad4644..8ae2d1fe 100644
--- a/flake/dev/public-and-dev-version-consistency.nix
+++ b/flake/dev/public-and-dev-version-consistency.nix
@@ -1,41 +1,44 @@
 { inputs, ... }:
 {
   perSystem =
-    { lib, pkgs, ... }:
     {
-      checks = lib.mkMerge (
-        map
-          (
-            input:
-            let
-              name = "${input}-and-dev-${input}-version-consistency";
-            in
-            {
-              ${name} =
-                let
-                  dev = inputs."dev-${input}".narHash;
-                  public = inputs.${input}.narHash;
-                in
-                pkgs.runCommand name { } ''
-                  if [ "${public}" != "${dev}" ]; then
-                    printf \
-                      'inconsistent ${input} (%s) and dev-${input} (%s) versions\n' \
-                      "${public}" \
-                      "${dev}" \
-                      >&2
+      lib,
+      pkgs,
+      system,
+      ...
+    }:
+    let
+      checks = lib.genAttrs' [ "flake-parts" "nixpkgs" "systems" ] (
+        input:
+        let
+          name = "${input}-and-dev-${input}-version-consistency";
+        in
+        lib.nameValuePair name (
+          let
+            dev = inputs."dev-${input}".narHash;
+            public = inputs.${input}.narHash;
+          in
+          pkgs.runCommand name { } ''
+            if [ "${public}" != "${dev}" ]; then
+              printf \
+                'inconsistent ${input} (%s) and dev-${input} (%s) versions\n' \
+                "${public}" \
+                "${dev}" \
+                >&2
 
-                    exit 1
-                  fi
+              exit 1
+            fi
 
-                  mkdir "$out"
-                '';
-            }
-          )
-          [
-            "flake-parts"
-            "nixpkgs"
-            "systems"
-          ]
+            mkdir "$out"
+          ''
+        )
       );
+    in
+    {
+      inherit checks;
+
+      ci.buildbot = lib.mkIf (system == "x86_64-linux") {
+        public-and-dev-version-consistency = pkgs.linkFarm "public-and-dev-version-consistency" checks;
+      };
     };
 }
diff --git a/modules/gnome/nixos.nix b/modules/gnome/nixos.nix
index 0e2cbe82..5d80941e 100644
--- a/modules/gnome/nixos.nix
+++ b/modules/gnome/nixos.nix
@@ -29,12 +29,14 @@ in
         )
       )
       {
-        # As Stylix is controlling the wallpaper, there is no need for this
+        # If Stylix is controlling the wallpaper, there is no need for this
         # pack of default wallpapers to be installed.
         # If you want to use one, you can set stylix.image to something like
         # "${pkgs.gnome-backgrounds}/path/to/your/preferred/background"
         # which will then download the pack regardless of its exclusion below.
-        environment.gnome.excludePackages = [ pkgs.gnome-backgrounds ];
+        environment.gnome.excludePackages = lib.mkIf (config.stylix.image != null) [
+          pkgs.gnome-backgrounds
+        ];
 
         nixpkgs.overlays = [
           (_: super: {
diff --git a/modules/neovim/nvf.nix b/modules/neovim/nvf.nix
index 8aa22438..4f5bc749 100644
--- a/modules/neovim/nvf.nix
+++ b/modules/neovim/nvf.nix
@@ -3,6 +3,7 @@ mkTarget:
 mkTarget {
   name = "nvf";
   humanName = "nvf";
+
   options = {
     plugin = lib.mkOption {
       type = lib.types.enum [
diff --git a/modules/qt/hm.nix b/modules/qt/hm.nix
index 44098703..732a9623 100644
--- a/modules/qt/hm.nix
+++ b/modules/qt/hm.nix
@@ -28,6 +28,28 @@
       type = lib.types.str;
       default = "qtct";
     };
+
+    standardDialogs = lib.mkOption {
+      description = ''
+        Selects the standard dialogs theme to be used by Qt.
+
+        Using `xdgdesktopportal` integrates with the native desktop portal.
+      '';
+
+      # The enum variants are derived from the qt6ct platform theme integration
+      # [1].
+      #
+      # [1]: https://www.opencode.net/trialuser/qt6ct/-/blob/00823e41aa60e8fe266d5aee328e82ad1ad94348/src/qt6ct/appearancepage.cpp#L83-L92
+      type = lib.types.enum [
+        "default"
+        "gtk2"
+        "gtk3"
+        "kde"
+        "xdgdesktopportal"
+      ];
+
+      default = "default";
+    };
   };
 
   config = lib.mkIf (config.stylix.enable && config.stylix.targets.qt.enable) (
@@ -75,46 +97,38 @@
 
       home.packages = lib.optional (config.qt.style.name == "kvantum") kvantumPackage;
 
-      qt = {
-        enable = true;
-        style.name = recommendedStyle;
-        platformTheme.name = config.stylix.targets.qt.platform;
-      };
-
-      xdg.configFile =
+      qt =
         let
-          qtctConf = ''
-            [Appearance]
-            custom_palette=true
-          ''
-          + lib.optionalString (config.qt.style ? name) ''
-            style=${config.qt.style.name}
-          ''
-          + lib.optionalString (icons != null) ''
-            icon_theme=${icons}
-          ''
-          + ''
-            [Fonts]
-            fixed="${config.stylix.fonts.monospace.name},${toString config.stylix.fonts.sizes.applications}"
-            general="${config.stylix.fonts.sansSerif.name},${toString config.stylix.fonts.sizes.applications}"
-          '';
+          qtctSettings = {
+            Appearance = {
+              custom_palette = true;
+              standard_dialogs = config.stylix.targets.qt.standardDialogs;
+              style = lib.mkIf (config.qt.style ? name) config.qt.style.name;
+              icon_theme = lib.mkIf (icons != null) icons;
+            };
 
+            Fonts = {
+              fixed = ''"${config.stylix.fonts.monospace.name},${toString config.stylix.fonts.sizes.applications}"'';
+              general = ''"${config.stylix.fonts.sansSerif.name},${toString config.stylix.fonts.sizes.applications}"'';
+            };
+          };
         in
-        lib.mkMerge [
-          (lib.mkIf (config.qt.style.name == "kvantum") {
-            "Kvantum/kvantum.kvconfig".source =
-              (pkgs.formats.ini { }).generate "kvantum.kvconfig"
-                { General.theme = "Base16Kvantum"; };
+        {
+          enable = true;
+          style.name = recommendedStyle;
+          platformTheme.name = config.stylix.targets.qt.platform;
 
-            "Kvantum/Base16Kvantum".source =
-              "${kvantumPackage}/share/Kvantum/Base16Kvantum";
-          })
+          qt5ctSettings = lib.mkIf (config.qt.platformTheme.name == "qtct") qtctSettings;
+          qt6ctSettings = lib.mkIf (config.qt.platformTheme.name == "qtct") qtctSettings;
+        };
 
-          (lib.mkIf (config.qt.platformTheme.name == "qtct") {
-            "qt5ct/qt5ct.conf".text = qtctConf;
-            "qt6ct/qt6ct.conf".text = qtctConf;
-          })
-        ];
+      xdg.configFile = lib.mkIf (config.qt.style.name == "kvantum") {
+        "Kvantum/kvantum.kvconfig".source =
+          (pkgs.formats.ini { }).generate "kvantum.kvconfig"
+            { General.theme = "Base16Kvantum"; };
+        "Kvantum/Base16Kvantum".source =
+          "${kvantumPackage}/share/Kvantum/Base16Kvantum";
+      };
     }
   );
 }
diff --git a/modules/qt/kvconfig.mustache b/modules/qt/kvconfig.mustache
index 9388d11b..a5575c43 100644
--- a/modules/qt/kvconfig.mustache
+++ b/modules/qt/kvconfig.mustache
@@ -80,7 +80,7 @@ light.color=#{{base03-hex}}
 mid.light.color=#{{base03-hex}}
 dark.color=#{{base00-hex}}
 mid.color=#{{base00-hex}}
-highlight.color=#{{base03-hex}}
+highlight.color=#{{base0E-hex}}
 inactive.highlight.color=#{{base03-hex}}
 tooltip.base.color=#{{base00-hex}}
 text.color=#{{base05-hex}}
@@ -88,7 +88,7 @@ window.text.color=#{{base05-hex}}
 button.text.color=#{{base05-hex}}
 disabled.text.color=#{{base04-hex}}
 tooltip.text.color=#{{base05-hex}}
-highlight.text.color=#{{base05-hex}}
+highlight.text.color=#{{base00-hex}}
 link.color=#{{base0D-hex}}
 link.visited.color=#{{base0E-hex}}