feat(other): guide standalone users to settings.json from the no-paths empty state

The standalone empty state showed the folder_paths keys but not where to
put them, and its Open Settings button led to a modal that cannot edit
primary folder paths. Now the page shows the real settings.json path and
an Open Settings Folder button backed by the existing open-location API.

Also stop open_settings_location from claiming success on headless Linux
sessions: with no DISPLAY/WAYLAND_DISPLAY, xdg-open cannot work, so the
handler now returns clipboard mode and the browser copies/shows the path
instead.

py/routes/handlers/misc_handlers.py

@@ -421,6 +421,11 @@ def _wsl_to_windows_path(wsl_path: str) -> str | None:
         return None
 
 
+def _has_gui_display() -> bool:
+    """Check whether a GUI session is reachable for xdg-open."""
+    return bool(os.environ.get("DISPLAY") or os.environ.get("WAYLAND_DISPLAY"))
+
+
 class PromptServerProtocol(Protocol):
     """Subset of PromptServer used by the handlers."""
 
@@ -3393,6 +3398,18 @@ class FileSystemHandler:
                     subprocess.Popen(["open", "-R", settings_file])
                 else:
                     folder = os.path.dirname(settings_file)
+                    if not _has_gui_display():
+                        # Headless/SSH session: xdg-open cannot open a file
+                        # manager, so hand the path to the browser for copying
+                        # instead of reporting a success that never happened.
+                        return web.json_response(
+                            {
+                                "success": True,
+                                "message": "Headless session: path available for copying",
+                                "path": settings_file,
+                                "mode": "clipboard",
+                            }
+                        )
                     subprocess.Popen(["xdg-open", folder])
 
             return web.json_response(

py/routes/other_routes.py

@@ -83,11 +83,16 @@ class OtherRoutes(BaseModelRoutes):
         # resolved to no existing folder. Render an actionable empty state
         # instead of an apparently broken empty grid.
         standalone_mode = os.environ.get("LORA_MANAGER_STANDALONE", "0") == "1"
-        return {
+        context = {
             "other_disabled": False,
             "other_no_paths": not bool(config.other_roots),
             "standalone_mode": standalone_mode,
         }
+        if standalone_mode:
+            # The settings UI cannot edit primary folder_paths, so the empty
+            # state must point at the actual file the user has to edit.
+            context["settings_file"] = getattr(self._settings, "settings_file", "") or ""
+        return context
 
     def _get_expected_model_types(self) -> str:
         """Get expected model types string for error messages"""