added a flag to hide settings (#5263)

Added an optional flag in settings.yml to hide the settings button in no
login servers. When hidden, users can no longer:

- Open the Settings modal at all (gear button is hidden)
- Change General preferences (tool picker mode, hide unavailable
tools/conversions, auto‑unzip and file limit)
- Configure keyboard shortcuts (Hotkeys / Keyboard Shortcuts section)
- Use the in‑app update checker UI (see current/latest version, check
for updates, view update details)
- Note: When enableLogin === true, the flag is ignored and the Settings
button remains visible.

---------

Co-authored-by: Anthony Stirling <77850077+Frooodle@users.noreply.github.com>
Co-authored-by: Reece Browne <74901996+reecebrowne@users.noreply.github.com>

frontend/src/core/components/shared/QuickAccessBar.tsx

@@ -173,6 +173,12 @@ const QuickAccessBar = forwardRef<HTMLDivElement>((_, ref) => {
   //  onClick: () => setActiveButton('activity')
   //},
 
+  // Determine if settings button should be hidden
+  // Hide when login is disabled AND showSettingsWhenNoLogin is false
+  const shouldHideSettingsButton =
+    config?.enableLogin === false &&
+    config?.showSettingsWhenNoLogin === false;
+
   const bottomButtons: ButtonConfig[] = [
     {
       id: 'help',
@@ -185,17 +191,17 @@ const QuickAccessBar = forwardRef<HTMLDivElement>((_, ref) => {
         // This will be overridden by the wrapper logic
       },
     },
-    {
+    ...(shouldHideSettingsButton ? [] : [{
       id: 'config',
       name: t("quickAccess.settings", "Settings"),
       icon: <LocalIcon icon="settings-rounded" width="1.25rem" height="1.25rem" />,
-      size: 'md',
-      type: 'modal',
+      size: 'md' as const,
+      type: 'modal' as const,
       onClick: () => {
         navigate('/settings/overview');
         setConfigModalOpen(true);
       }
-    }
+    } as ButtonConfig])
   ];
 
   return (

frontend/src/core/contexts/AppConfigContext.tsx

@@ -23,6 +23,7 @@ export interface AppConfig {
   defaultLocale?: string;
   logoStyle?: 'modern' | 'classic';
   enableLogin?: boolean;
+  showSettingsWhenNoLogin?: boolean;
   enableEmailInvites?: boolean;
   isAdmin?: boolean;
   enableAlphaFunctionality?: boolean;