feat: nixos - Screenshot Annotation via satty (#256)

Signed-off-by: Ryan Yin <xiaoyin_c@qq.com>

home/linux/gui/niri/conf/keybindings.kdl

@@ -232,7 +232,8 @@ binds {
     // Mod+Space       { switch-layout "next"; }
     // Mod+Shift+Space { switch-layout "prev"; }
 
-    Print { screenshot; }
+    // Screenshot Annotation via satty
+    Print { spawn-sh "set -e; grim -t ppm -g \"$(slurp -o -d -F monospace)\" - | satty --filename - --copy-command=wl-copy --annotation-size-factor 2.0 --output-filename=\"$(xdg-user-dir PICTURES)/Screenshots/Screenshot from %Y-%m-%d %H:%M:%S.png\" --actions-on-enter=\"save-to-clipboard,exit\" --brush-smooth-history-size=5 --disable-notifications"; }
     Ctrl+Print { screenshot-screen; }
     Alt+Print { screenshot-window; }
 

home/linux/gui/niri/default.nix

@@ -18,6 +18,11 @@ in
         home.packages = with pkgs; [
           # Niri v25.08 will create X11 sockets on disk, export $DISPLAY, and spawn `xwayland-satellite` on-demand when an X11 client connects
           xwayland-satellite
+
+          # for Screenshot Annotation
+          slurp
+          grim
+          satty
         ];
 
         xdg.configFile =