diff --git a/apps/ui/src/components/layout/sidebar/components/project-actions.tsx b/apps/ui/src/components/layout/sidebar/components/project-actions.tsx
index 3730afe7..4ef09d5a 100644
--- a/apps/ui/src/components/layout/sidebar/components/project-actions.tsx
+++ b/apps/ui/src/components/layout/sidebar/components/project-actions.tsx
@@ -40,7 +40,7 @@ export function ProjectActions({
         data-testid="new-project-button"
       >
         <Plus className="w-4 h-4 shrink-0 transition-transform duration-200 group-hover:rotate-90 group-hover:text-brand-500" />
-        <span className="ml-2 text-sm font-medium hidden lg:block whitespace-nowrap">New</span>
+        <span className="ml-2 text-sm font-medium block whitespace-nowrap">New</span>
       </button>
       <button
         onClick={handleOpenFolder}
@@ -59,7 +59,7 @@ export function ProjectActions({
         data-testid="open-project-button"
       >
         <FolderOpen className="w-4 h-4 shrink-0 transition-transform duration-200 group-hover:scale-110" />
-        <span className="hidden lg:flex items-center justify-center min-w-5 h-5 px-1.5 text-[10px] font-mono rounded-md bg-muted/80 text-muted-foreground ml-2">
+        <span className="flex items-center justify-center min-w-5 h-5 px-1.5 text-[10px] font-mono rounded-md bg-muted/80 text-muted-foreground ml-2">
           {formatShortcut(shortcuts.openProject, true)}
         </span>
       </button>
diff --git a/apps/ui/src/components/layout/sidebar/components/sidebar-footer.tsx b/apps/ui/src/components/layout/sidebar/components/sidebar-footer.tsx
index 38381836..081add89 100644
--- a/apps/ui/src/components/layout/sidebar/components/sidebar-footer.tsx
+++ b/apps/ui/src/components/layout/sidebar/components/sidebar-footer.tsx
@@ -235,7 +235,7 @@ export function SidebarFooter({
           {sidebarOpen && (
             <span
               className={cn(
-                'hidden sm:flex items-center justify-center min-w-5 h-5 px-1.5 text-[10px] font-mono rounded-md transition-all duration-200',
+                'flex items-center justify-center min-w-5 h-5 px-1.5 text-[10px] font-mono rounded-md transition-all duration-200',
                 isActiveRoute('settings')
                   ? 'bg-brand-500/20 text-brand-400'
                   : 'bg-muted text-muted-foreground group-hover:bg-accent'
diff --git a/apps/ui/src/components/layout/sidebar/components/sidebar-navigation.tsx b/apps/ui/src/components/layout/sidebar/components/sidebar-navigation.tsx
index f587aafc..6480322c 100644
--- a/apps/ui/src/components/layout/sidebar/components/sidebar-navigation.tsx
+++ b/apps/ui/src/components/layout/sidebar/components/sidebar-navigation.tsx
@@ -26,7 +26,7 @@ export function SidebarNavigation({
         // Placeholder when no project is selected (only in expanded state)
         <div className="flex items-center justify-center h-full px-4">
           <p className="text-muted-foreground text-sm text-center">
-            <span className="hidden lg:block">Select or create a project above</span>
+            <span className="block">Select or create a project above</span>
           </p>
         </div>
       ) : currentProject ? (
@@ -137,7 +137,7 @@ export function SidebarNavigation({
                     {item.shortcut && sidebarOpen && !item.count && (
                       <span
                         className={cn(
-                          'hidden sm:flex items-center justify-center min-w-5 h-5 px-1.5 text-[10px] font-mono rounded-md transition-all duration-200',
+                          'flex items-center justify-center min-w-5 h-5 px-1.5 text-[10px] font-mono rounded-md transition-all duration-200',
                           isActive
                             ? 'bg-brand-500/20 text-brand-400'
                             : 'bg-muted text-muted-foreground group-hover:bg-accent'
diff --git a/libs/types/src/settings.ts b/libs/types/src/settings.ts
index 38402c24..a542d79a 100644
--- a/libs/types/src/settings.ts
+++ b/libs/types/src/settings.ts
@@ -380,6 +380,12 @@ export interface GlobalSettings {
   /** Mute completion notification sound */
   muteDoneSound: boolean;
 
+  // Notification Command
+  /** Custom command to execute for all notifications (empty = disabled) */
+  notificationCommand: string;
+  /** How to pass notification data to the command */
+  notificationCommandMode: 'args' | 'stdin' | 'env';
+
   // AI Model Selection (per-phase configuration)
   /** Phase-specific AI model configuration */
   phaseModels: PhaseModelConfig;
@@ -699,6 +705,8 @@ export const DEFAULT_GLOBAL_SETTINGS: GlobalSettings = {
   defaultPlanningMode: 'skip',
   defaultRequirePlanApproval: false,
   muteDoneSound: false,
+  notificationCommand: '',
+  notificationCommandMode: 'args',
   phaseModels: DEFAULT_PHASE_MODELS,
   enhancementModel: 'sonnet',
   validationModel: 'opus',