Session overhaul: dev tooling, cleanup, theming, fixes

Tooling:
- nh + nvd/nom/statix/deadnix/comma (new programs/nix.nix); GC via nh clean
- zoxide (cd), atuin, just, lazydocker, dust, duf, difftastic (git dft)

Structure:
- rename desktop -> konishi; homeConfigurations -> "user@host" for nh autodetect

Removals (heavy/unused):
- android-studio, unity/.NET/omnisharp/vscode, kicad, zoom, calibre,
  google-fonts, nerd-dictation

Screen recording:
- kooha + vokoscreen-ng + `webcam` corner-cam command/window-rule

Fixes:
- WEBKIT_DISABLE_DMABUF_RENDERER moved to common (electron/tauri on intel)
- kitty pinned to Catppuccin-Mocha; darkman no longer toggles kitty/claude
- claude theme dark + statusline locale fix
- ssh: migrate to settings API + multiplexing/keepalive/AddKeysToAgent;
  gpg-agent enableSshSupport
- silence hyprland configType / gtk4 / xdg userDirs deprecations

Flake hygiene:
- follows=nixpkgs for foundry/hardware/rose-pine/zen/spicetify (10->5 nixpkgs)
- zoxide _ZO_DOCTOR=0

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

home/common/programs/desktop/default.nix

@@ -10,48 +10,56 @@
     ./spicetify.nix
   ];
 
-  home.packages = with pkgs; [
-    # various
-    google-chrome
-    thunar
-    obsidian
-    mpv
-    obs-studio
-    calibre
-    gimp
-    font-manager
-    imv
-    pavucontrol
-    zathura
-    libsForQt5.qt5ct
-    kdePackages.qt6ct
-    nwg-look
-    xournalpp
-    jq
-    ffmpeg
-    unzip
+  home = {
+    packages = with pkgs; [
+      # various
+      google-chrome
+      thunar
+      obsidian
+      mpv
+      # screen recording — evaluating these
+      obs-studio
+      kooha # simple Wayland-native screen+audio recorder
+      vokoscreen-ng # GUI recorder with webcam overlay
+      gimp
+      font-manager
+      imv
+      pavucontrol
+      zathura
+      libsForQt5.qt5ct
+      kdePackages.qt6ct
+      nwg-look
+      xournalpp
+      jq
+      ffmpeg
+      unzip
 
-    # remote desktop
-    remmina
+      # remote desktop
+      remmina
 
-    # networking
-    networkmanagerapplet
-    mtr
-    dnsutils
+      # networking
+      networkmanagerapplet
+      mtr
+      dnsutils
 
-    # communication
-    slack
-    zoom-us
-    ferdium
-    signal-desktop
+      # communication
+      slack
+      ferdium
+      signal-desktop
 
-    # dev tools
-    yaak
-    bun
+      # dev tools
+      yaak
+      bun
 
-    # themes
-    tela-icon-theme
-  ];
+      # themes
+      tela-icon-theme
+    ];
+
+    pointerCursor = {
+      package = pkgs.numix-cursor-theme;
+      name = "Numix-Cursor-Light";
+    };
+  };
 
   gtk = {
     enable = true;
@@ -71,31 +79,37 @@
     };
   };
 
-  home.pointerCursor = {
-    package = pkgs.numix-cursor-theme;
-    name = "Numix-Cursor-Light";
+  xdg.configFile = {
+    # zathura: include noctalia-generated theme
+    "zathura/zathurarc".text = ''
+      include noctaliarc
+    '';
+
+    # gtk: include noctalia-generated css (mkForce to override gtk module)
+    "gtk-3.0/gtk.css".text = lib.mkForce ''
+      @import url("noctalia.css");
+    '';
+    "gtk-4.0/gtk.css".text = lib.mkForce ''
+      @import url("noctalia.css");
+    '';
+
+    # qt: use noctalia color scheme. Applied via QT_QPA_PLATFORMTHEME=qt6ct,
+    # set in the Hyprland env block (and imported into the dbus activation
+    # environment so the xdph screen-share picker inherits it too).
+    # custom_palette=true is required for qt5ct/qt6ct to actually apply the
+    # color scheme; Fusion is used because it fully honors a custom palette
+    # (Breeze/native styles partly ignore it).
+    "qt5ct/qt5ct.conf".text = ''
+      [Appearance]
+      style=Fusion
+      custom_palette=true
+      color_scheme_path=${config.home.homeDirectory}/.config/qt5ct/colors/noctalia.conf
+    '';
+    "qt6ct/qt6ct.conf".text = ''
+      [Appearance]
+      style=Fusion
+      custom_palette=true
+      color_scheme_path=${config.home.homeDirectory}/.config/qt6ct/colors/noctalia.conf
+    '';
   };
-
-  # zathura: include noctalia-generated theme
-  xdg.configFile."zathura/zathurarc".text = ''
-    include noctaliarc
-  '';
-
-  # gtk: include noctalia-generated css (mkForce to override gtk module)
-  xdg.configFile."gtk-3.0/gtk.css".text = lib.mkForce ''
-    @import url("noctalia.css");
-  '';
-  xdg.configFile."gtk-4.0/gtk.css".text = lib.mkForce ''
-    @import url("noctalia.css");
-  '';
-
-  # qt: use noctalia color scheme
-  xdg.configFile."qt5ct/qt5ct.conf".text = ''
-    [Appearance]
-    color_scheme_path=${config.home.homeDirectory}/.config/qt5ct/colors/noctalia.conf
-  '';
-  xdg.configFile."qt6ct/qt6ct.conf".text = ''
-    [Appearance]
-    color_scheme_path=${config.home.homeDirectory}/.config/qt6ct/colors/noctalia.conf
-  '';
 }