feat(hyprland): integrate yazi as global file picker via xdg-portal

apps/yazi/default.nix

@@ -1,4 +1,35 @@
-{pkgs, ...}: {
+{
+  pkgs,
+  config,
+  ...
+}: let
+  yazi-picker = pkgs.writeShellScriptBin "yazi-picker" ''
+    path="$1"
+    [ -z "$path" ] && path="."
+
+    if [ "$2" = "true" ]; then
+        # Save file mode
+        # In save mode, we might want to just open the directory, 
+        # but yazi --chooser-file works for picking a file to overwrite or a directory.
+        # For a "Save As" flow where you type a name, standard yazi chooser might be limited
+        # without custom lua, but selecting a directory works.
+        # For now, treat same as open.
+        :
+    fi
+
+    out="$HOME/.cache/yazi-chooser"
+    rm -f "$out"
+
+    # We need to block until ghostty closes, or use --wait if available/default behavior.
+    # Ghostty -e does not automatically detach, so it should block.
+    ${pkgs.ghostty}/bin/ghostty --class="yazi-picker" --title="File Picker" -e ${pkgs.yazi}/bin/yazi "$path" --chooser-file="$out"
+
+    if [ -f "$out" ]; then
+      cat "$out"
+      rm "$out"
+    fi
+  '';
+in {
   programs.yazi = {
     enable = true;
     enableFishIntegration = true;
@@ -11,4 +42,13 @@
       };
     };
   };
+
+  home.packages = [
+    yazi-picker
+  ];
+
+  xdg.configFile."xdg-desktop-portal-termfilechooser/config".text = ''
+    [filechooser]
+    cmd=${yazi-picker}/bin/yazi-picker
+  '';
 }