feat: replace waybar/walker/swaylock/swaybg with noctalia shell

home/modules/applications/default.nix

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+{ pkgs, ... }:
+{
+  # home-manager's fontconfig module references removed nodePackages;
+  # NixOS manages fontconfig at the system level anyway
+  fonts.fontconfig.enable = false;
+
+  home.sessionVariables.NIXOS_OZONE_WL = "1";
+
+  home.packages = with pkgs; [
+    # Browsers
+    zen-browser
+    claude-desktop
+
+    # Terminals
+    ghostty
+    kitty
+    foot
+
+    # Niri support
+    xdg-utils
+    inotify-tools
+
+    # Editor
+    vscodium
+
+    # Daily apps
+    mpv
+    imv
+    gimp
+    obs-studio
+    zathura
+    thunar
+    xfce.thunar-archive-plugin
+    xfce.tumbler
+    ffmpegthumbnailer
+    xarchiver
+    grim
+    slurp
+    swappy
+    libreoffice
+    telegram-desktop
+    pavucontrol
+    blueman
+
+    # Clipboard
+    cliphist
+    wl-clipboard
+
+    # CLI tools
+    vim
+    neovim
+    tmux
+    fastfetch
+    btop
+    ripgrep
+    fd
+    fzf
+    eza
+    bat
+    dust
+    jq
+    yq
+    shellcheck
+    ffmpeg
+    imagemagick
+    unzip
+    p7zip
+    wiremix
+
+    # System control
+    brightnessctl
+    playerctl
+
+    # Dev tools
+    gh
+  ];
+
+  # KDE Plasma session: dark theme + touchpad preferences
+  programs.plasma = {
+    enable = true;
+    workspace.lookAndFeel = "org.kde.breezedark.desktop";
+    input.touchpads = [
+      {
+        name          = "SynPS/2 Synaptics TouchPad";
+        vendorId      = "2";
+        productId     = "7";
+        naturalScroll = true;
+        pointerSpeed  = 0.4;
+        scrollSpeed   = 0.75;
+      }
+    ];
+  };
+}

home/modules/cli/default.nix

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+{ ... }:
+{
+  programs.zsh = {
+    enable = true;
+    autosuggestion.enable    = true;
+    syntaxHighlighting.enable = true;
+  };
+
+  programs.zoxide = {
+    enable             = true;
+    enableZshIntegration = true;
+  };
+
+  programs.starship.enable = true;
+
+  programs.git = {
+    enable = true;
+    settings.user = {
+      name  = "duynguyen";
+      email = "huonghaiduynhim@gmail.com";
+    };
+  };
+}

home/modules/kitty/default.nix

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+{ ... }:
+{
+  programs.kitty = {
+    enable = true;
+    settings.wheel_scroll_multiplier = 10;
+  };
+}

home/modules/niri/default.nix

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+{ pkgs, lib, ... }:
+let
+  # Start from niri's own default config so we inherit every new default
+  # automatically on updates. We patch only what we need to change.
+  base = builtins.readFile "${pkgs.niri.doc}/share/doc/niri/default-config.kdl";
+
+  # waybar → noctalia  +  add xwayland-satellite
+  r1 = builtins.replaceStrings
+    [ "spawn-at-startup \"waybar\"\n" ]
+    [ "spawn-at-startup \"noctalia\"\nspawn-at-startup \"xwayland-satellite\"\n" ]
+    base;
+
+  # terminal: alacritty → kitty
+  r2 = builtins.replaceStrings
+    [ "    Mod+T hotkey-overlay-title=\"Open a Terminal: alacritty\" { spawn \"alacritty\"; }\n" ]
+    [ "    Mod+T hotkey-overlay-title=\"Open a Terminal: kitty\" { spawn \"kitty\"; }\n" ]
+    r1;
+
+  # launcher: fuzzel → noctalia launcher + control-center
+  r3 = builtins.replaceStrings
+    [ "    Mod+D hotkey-overlay-title=\"Run an Application: fuzzel\" { spawn \"fuzzel\"; }\n" ]
+    [ "    Mod+Space hotkey-overlay-title=\"Noctalia: Launcher\"       { spawn \"noctalia-ipc\" \"panel-toggle\" \"launcher\"; }\n    Mod+S     hotkey-overlay-title=\"Noctalia: Control Center\" { spawn \"noctalia-ipc\" \"panel-toggle\" \"control-center\"; }\n" ]
+    r2;
+
+  # lock: swaylock → noctalia
+  r4 = builtins.replaceStrings
+    [ "    Super+Alt+L hotkey-overlay-title=\"Lock the Screen: swaylock\" { spawn \"swaylock\"; }\n" ]
+    [ "    Super+Alt+L hotkey-overlay-title=\"Noctalia: Lock\" { spawn \"noctalia-ipc\" \"session\" \"lock\"; }\n" ]
+    r3;
+
+  # skip the hotkey overlay pop-up at startup
+  r5 = builtins.replaceStrings
+    [ "    // skip-at-startup\n" ]
+    [ "    skip-at-startup\n" ]
+    r4;
+
+  # tighter gaps
+  r6 = builtins.replaceStrings
+    [ "    gaps 16\n" ]
+    [ "    gaps 8\n" ]
+    r5;
+
+  # enable animations slowdown
+  r7 = builtins.replaceStrings
+    [ "    // slowdown 3.0\n" ]
+    [ "    slowdown 0.5\n" ]
+    r6;
+
+  # Our additions appended after the patched default config.
+  # A second `input { touchpad { } }` block overrides earlier touchpad settings.
+  customConfig = ''
+
+    // ── Touchpad ─────────────────────────────────────────────────────────────
+    input {
+        touchpad {
+            tap
+            natural-scroll
+            accel-profile "flat"
+            scroll-factor 1.0
+        }
+    }
+
+    // ── Prefer no client-side decorations ────────────────────────────────────
+    prefer-no-csd
+
+    // ── Gestures ─────────────────────────────────────────────────────────────
+    gestures {
+        hot-corners {
+            off
+        }
+    }
+
+    // ── Rounded corners ──────────────────────────────────────────────────────
+    window-rule {
+        geometry-corner-radius 12
+        clip-to-geometry true
+    }
+
+    // ── Floating windows ─────────────────────────────────────────────────────
+    window-rule {
+        match app-id=r#"^Tk$"#
+        match app-id=r#"^gimp$"# title=r#"Preferences"#
+        match app-id=r#"^mpv$"#
+        match app-id=r#"^soffice$"# title=r#"^Text Import"#
+        match app-id=r#"^thunar$"# title=r#"^Rename "#
+        match app-id=r#"^xarchiver$"#
+        match app-id=r#"firefox$"# title=r#"^Picture-in-Picture$"#
+
+        open-floating true
+    }
+  '';
+in
+{
+  imports = [ ./noctalia ./polkit ];
+
+  # .text writes a real file (not a nix-store symlink) so niri auto-reloads on rebuild
+  xdg.configFile."niri/config.kdl".text = r7 + customConfig;
+}

home/modules/niri/noctalia/default.nix

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+{ config, inputs, pkgs, ... }:
+let
+  wallpaperDir    = "${config.home.homeDirectory}/.config/wallpapers";
+  defaultWallpaper = "${wallpaperDir}/even-in-arcadia.png";
+
+  noctaliaIpc = pkgs.writeShellScriptBin "noctalia-ipc" ''
+    set -eu
+    exec noctalia msg "$@"
+  '';
+in
+{
+  imports = [ inputs.noctalia.homeModules.default ];
+
+  home.packages = [ noctaliaIpc ];
+
+  # Wallpapers tracked in the repo; linked to ~/.config/wallpapers for noctalia
+  xdg.configFile."wallpapers".source = ./wallpapers;
+
+  programs.noctalia = {
+    enable = true;
+    settings = {
+      bar.default = {
+        start          = [ "launcher" "clipboard" "cpu" "network" "ram" ];
+        center         = [ "clock" ];
+        end            = [ "notifications" "volume" "brightness" "battery" "control-center" "session" ];
+        thickness      = 40;
+        padding        = 10;
+        radius         = 0;
+        margin_edge    = 0;
+        margin_ends    = 0;
+        widget_spacing = 8;
+      };
+
+      idle = {
+        behavior_order = [ "lock" "screen-off" ];
+        behavior = {
+          lock = {
+            action  = "lock";
+            enabled = true;
+            timeout = 600;
+          };
+          screen-off = {
+            action  = "screen_off";
+            enabled = true;
+            timeout = 660;
+          };
+        };
+      };
+
+      lockscreen.wallpaper = defaultWallpaper;
+
+      nightlight.enabled = true;
+
+      osd.position = "top_right";
+
+      shell = {
+        font_family         = "JetBrainsMono Nerd Font";
+        polkit_agent        = true;
+        corner_radius_scale = 0.0;
+        animation.speed     = 1.5;
+        panel = {
+          clipboard_placement     = "attached";
+          launcher_placement      = "attached";
+          launcher_session_search = true;
+        };
+        shadow.alpha = 0.5;
+      };
+
+      theme.builtin = "Kanagawa";
+
+      wallpaper = {
+        enabled      = true;
+        directory    = wallpaperDir;
+        default.path = defaultWallpaper;
+      };
+    };
+  };
+}

home/modules/niri/polkit/default.nix

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+{ pkgs, ... }:
+{
+  home.packages = [ pkgs.kdePackages.polkit-kde-agent-1 ];
+
+  systemd.user.services.polkit-kde-agent = {
+    Unit = {
+      Description = "KDE Polkit Authentication Agent";
+      PartOf      = [ "graphical-session.target" ];
+      After       = [ "graphical-session.target" ];
+    };
+    Service = {
+      ExecStart  = "${pkgs.kdePackages.polkit-kde-agent-1}/libexec/polkit-kde-authentication-agent-1";
+      Restart    = "on-failure";
+      RestartSec = 1;
+    };
+    Install.WantedBy = [ "graphical-session.target" ];
+  };
+}