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.

static/js/other_disabled.js

@@ -7,8 +7,10 @@ import { enableOtherModels, openOtherModelsSettings } from './utils/otherModels.
  * empty state whose button turns the feature on; the backend then rebuilds the
  * other-model roots and starts scanning, so a reload lands on the real page.
  *
- * The same module backs the "enabled but no folders found" state, where the
- * only useful action is jumping to Settings instead of enabling anything.
+ * The same module backs the "enabled but no folders found" state: ComfyUI
+ * mode points to the Settings page's Library section, while standalone mode
+ * (where the settings UI cannot edit primary folder paths) reveals the
+ * settings.json file the user must edit instead.
  */
 async function handleEnableClick() {
     const button = document.getElementById('enableOtherModelsBtn');
@@ -32,6 +34,41 @@ function handleOpenSettingsClick(event) {
     openOtherModelsSettings();
 }
 
+/**
+ * Open the settings.json location from the standalone no-folders state.
+ * The settings UI cannot edit primary folder_paths, so the only useful
+ * action is revealing the file itself (or copying its path in Docker).
+ */
+async function handleOpenSettingsFolderClick() {
+    const button = document.getElementById('openSettingsFolderBtn');
+    if (!button || button.disabled) return;
+
+    button.disabled = true;
+    try {
+        const response = await fetch('/api/lm/settings/open-location', { method: 'POST' });
+        const data = await response.json().catch(() => ({}));
+        if (!response.ok || data.success === false) {
+            throw new Error(data.error || `HTTP ${response.status}`);
+        }
+        if (data.mode === 'clipboard' && data.path) {
+            try {
+                await navigator.clipboard.writeText(data.path);
+                showToast('settings.openSettingsFileLocation.copied', { path: data.path }, 'success');
+            } catch (clipboardError) {
+                console.warn('Clipboard API not available:', clipboardError);
+                showToast('settings.openSettingsFileLocation.clipboardFallback', { path: data.path }, 'info');
+            }
+        } else {
+            showToast('settings.openSettingsFileLocation.success', {}, 'success');
+        }
+    } catch (error) {
+        console.error('Failed to open settings location:', error);
+        showToast('settings.openSettingsFileLocation.failed', {}, 'error');
+    } finally {
+        button.disabled = false;
+    }
+}
+
 async function initializeOtherDisabledPage() {
     // appCore.initialize() wires the shared header (theme, settings modal,
     // language) so this page is not a dead end.
@@ -46,8 +83,13 @@ async function initializeOtherDisabledPage() {
     if (settingsButton) {
         settingsButton.addEventListener('click', handleOpenSettingsClick);
     }
+
+    const settingsFolderButton = document.getElementById('openSettingsFolderBtn');
+    if (settingsFolderButton) {
+        settingsFolderButton.addEventListener('click', handleOpenSettingsFolderClick);
+    }
 }
 
 document.addEventListener('DOMContentLoaded', initializeOtherDisabledPage);
 
-export { handleEnableClick as enableOtherModels, initializeOtherDisabledPage };
+export { handleEnableClick as enableOtherModels, handleOpenSettingsFolderClick, initializeOtherDisabledPage };