Add ags-watch script and update devShell build inputs

flake.nix

@@ -34,6 +34,7 @@
         tray
         wireplumber
       ];
+
     in
     {
       packages.${system} = {
@@ -47,18 +48,26 @@
           # additional libraries and executables to add to gjs' runtime
           extraPackages = extraAgsLib ++ [ pkgs.fzf ];
         };
+
+        # Ags hot reload
+        ags-watch = pkgs.writeScriptBin "ags-watch" ''
+          #!${pkgs.fish}/bin/fish
+
+          ls **.tsx | ${pkgs.lib.getExe pkgs.entr} -r ags run -d ./ --gtk4
+        '';
       };
 
       devShells.${system} = {
         default = pkgs.mkShell {
           buildInputs = [
             # pkgs.typescript-language-server
+            pkgs.biome
+            pkgs.fish
             pkgs.glib
             pkgs.glibc
             pkgs.nodejs
             pkgs.pnpm
-            pkgs.biome
-            pkgs.watchexec
+            self.packages.${system}.ags-watch
             # includes astal3 astal4 astal-io by default
             (ags.packages.${system}.default.override {
               extraPackages = extraAgsLib;