feat: add global immersive/fullscreen mode support across pages

- Add isImmersiveMode state to appStore for global fullscreen management
- Update AppShell to hide Header and Sidebar when immersive mode is active
- Add fullscreen toggle button to workflow and knowledge pages:
  - TerminalDashboardPage, IssueHubPage, SessionsPage, LiteTasksPage
  - HistoryPage, TeamPage, MemoryPage, SkillsManagerPage
  - CommandsManagerPage, RulesManagerPage, CliViewerPage
  - OrchestratorPage (via FlowToolbar)
- Preserve padding in fullscreen mode for better visual appearance

ccw/frontend/src/components/layout/AppShell.tsx

@@ -2,6 +2,7 @@
 // AppShell Component
 // ========================================
 // Root layout component combining Header, Sidebar, and MainContent
+// Supports immersive mode to hide chrome for fullscreen experiences
 
 import { useState, useCallback, useEffect } from 'react';
 import { useLocation } from 'react-router-dom';
@@ -16,6 +17,7 @@ import { AskQuestionDialog, A2UIPopupCard } from '@/components/a2ui';
 import { BackgroundImage } from '@/components/shared/BackgroundImage';
 import { useNotificationStore, selectCurrentQuestion, selectCurrentPopupCard } from '@/stores';
 import { useWorkflowStore } from '@/stores/workflowStore';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 import { useWebSocketNotifications, useWebSocket } from '@/hooks';
 
 export interface AppShellProps {
@@ -40,6 +42,9 @@ export function AppShell({
   const projectPath = useWorkflowStore((state) => state.projectPath);
   const location = useLocation();
 
+  // Immersive mode (fullscreen) - hide chrome
+  const isImmersiveMode = useAppStore(selectIsImmersiveMode);
+
   // Workspace initialization logic (URL > localStorage)
   const [isWorkspaceInitialized, setWorkspaceInitialized] = useState(false);
 
@@ -157,32 +162,36 @@ export function AppShell({
   }, [setCurrentPopupCard]);
 
   return (
-    <div className="flex flex-col min-h-screen bg-background">
+    <div className={cn("flex flex-col min-h-screen bg-background", isImmersiveMode && "h-screen overflow-hidden")}>
       {/* Background image layer (z-index: -3 to -2) */}
       <BackgroundImage />
 
-      {/* Header - fixed at top */}
+      {/* Header - fixed at top (hidden in immersive mode) */}
+      {!isImmersiveMode && (
         <Header
           onRefresh={onRefresh}
           isRefreshing={isRefreshing}
           onCliMonitorClick={handleCliMonitorClick}
         />
+      )}
 
       {/* Main layout - sidebar + content */}
-      <div className="flex flex-1 overflow-hidden">
+      <div className={cn("flex flex-1 overflow-hidden", isImmersiveMode && "h-full")}>
-        {/* Sidebar - collapsed by default */}
+        {/* Sidebar - collapsed by default (hidden in immersive mode) */}
+        {!isImmersiveMode && (
           <Sidebar
             collapsed={sidebarCollapsed}
             onCollapsedChange={handleCollapsedChange}
             mobileOpen={mobileOpen}
             onMobileClose={handleMobileClose}
           />
+        )}
 
         {/* Main content area */}
         <MainContent
           className={cn(
             'app-shell-content transition-all duration-300',
-            sidebarCollapsed ? 'md:ml-16' : 'md:ml-64'
+            isImmersiveMode ? 'ml-0' : sidebarCollapsed ? 'md:ml-16' : 'md:ml-64'
           )}
         >
           {children}

ccw/frontend/src/pages/CliViewerPage.tsx

@@ -370,7 +370,7 @@ export function CliViewerPage() {
   const CurrentLayoutIcon = currentLayoutOption.icon;
 
   return (
-    <div className="h-full flex flex-col -m-4 md:-m-6">
+    <div className="h-full flex flex-col">
       {/* ======================================== */}
       {/* Toolbar */}
       {/* ======================================== */}

ccw/frontend/src/pages/CommandsManagerPage.tsx

@@ -16,7 +16,10 @@ import {
   Folder,
   User,
   AlertCircle,
+  Maximize2,
+  Minimize2,
 } from 'lucide-react';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 import { Card } from '@/components/ui/Card';
 import { Button } from '@/components/ui/Button';
 import { Input } from '@/components/ui/Input';
@@ -40,6 +43,10 @@ export function CommandsManagerPage() {
   // Search state
   const [searchQuery, setSearchQuery] = useState('');
 
+  // Immersive mode state
+  const isImmersiveMode = useAppStore(selectIsImmersiveMode);
+  const toggleImmersiveMode = useAppStore((s) => s.toggleImmersiveMode);
+
   const {
     commands,
     groupedCommands,
@@ -96,7 +103,7 @@ export function CommandsManagerPage() {
   };
 
   return (
-    <div className="space-y-6">
+    <div className={cn("space-y-6", isImmersiveMode && "h-screen overflow-hidden")}>
       {/* Page Header */}
       <div className="flex flex-col gap-4">
         <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
@@ -109,11 +116,25 @@ export function CommandsManagerPage() {
               {formatMessage({ id: 'commands.description' })}
             </p>
           </div>
+          <div className="flex items-center gap-2">
+            <button
+              onClick={toggleImmersiveMode}
+              className={cn(
+                'p-2 rounded-md transition-colors',
+                isImmersiveMode
+                  ? 'bg-primary/10 text-primary'
+                  : 'text-muted-foreground hover:text-foreground hover:bg-muted'
+              )}
+              title={isImmersiveMode ? 'Exit Fullscreen' : 'Fullscreen'}
+            >
+              {isImmersiveMode ? <Minimize2 className="w-4 h-4" /> : <Maximize2 className="w-4 h-4" />}
+            </button>
             <Button variant="outline" onClick={() => refetch()} disabled={isFetching}>
               <RefreshCw className={cn('w-4 h-4 mr-2', isFetching && 'animate-spin')} />
               {formatMessage({ id: 'common.actions.refresh' })}
             </Button>
           </div>
+        </div>
 
         {/* Error alert */}
         {error && (

ccw/frontend/src/pages/HistoryPage.tsx

@@ -13,7 +13,10 @@ import {
   AlertTriangle,
   Search,
   X,
+  Maximize2,
+  Minimize2,
 } from 'lucide-react';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 import { cn } from '@/lib/utils';
 import { useHistory } from '@/hooks/useHistory';
 import { ConversationCard } from '@/components/shared/ConversationCard';
@@ -53,6 +56,8 @@ export function HistoryPage() {
   const [isPanelOpen, setIsPanelOpen] = React.useState(false);
   const [nativeExecutionId, setNativeExecutionId] = React.useState<string | null>(null);
   const [isNativePanelOpen, setIsNativePanelOpen] = React.useState(false);
+  const isImmersiveMode = useAppStore(selectIsImmersiveMode);
+  const toggleImmersiveMode = useAppStore((s) => s.toggleImmersiveMode);
 
   const {
     executions,
@@ -134,7 +139,7 @@ export function HistoryPage() {
   };
 
   return (
-    <div className="space-y-6">
+    <div className={cn("space-y-6", isImmersiveMode && "h-screen overflow-hidden")}>
       {/* Header */}
       <div className="flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-between">
         <div>
@@ -146,6 +151,18 @@ export function HistoryPage() {
           </p>
         </div>
         <div className="flex items-center gap-2">
+          <button
+            onClick={toggleImmersiveMode}
+            className={cn(
+              'p-2 rounded-md transition-colors',
+              isImmersiveMode
+                ? 'bg-primary/10 text-primary'
+                : 'text-muted-foreground hover:text-foreground hover:bg-muted'
+            )}
+            title={isImmersiveMode ? 'Exit Fullscreen' : 'Fullscreen'}
+          >
+            {isImmersiveMode ? <Minimize2 className="w-4 h-4" /> : <Maximize2 className="w-4 h-4" />}
+          </button>
           <Button
             variant="outline"
             size="sm"

ccw/frontend/src/pages/IssueHubPage.tsx

@@ -11,6 +11,8 @@ import {
   RefreshCw,
   Github,
   Loader2,
+  Maximize2,
+  Minimize2,
 } from 'lucide-react';
 import { IssueHubHeader } from '@/components/issue/hub/IssueHubHeader';
 import { IssueHubTabs, type IssueTab } from '@/components/issue/hub/IssueHubTabs';
@@ -29,6 +31,7 @@ import { useIssues, useIssueMutations, useIssueQueue } from '@/hooks';
 import { pullIssuesFromGitHub, uploadAttachments } from '@/lib/api';
 import type { Issue } from '@/lib/api';
 import { cn } from '@/lib/utils';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 
 // Issue types
 type IssueType = 'bug' | 'feature' | 'improvement' | 'other';
@@ -286,6 +289,10 @@ export function IssueHubPage() {
   const [isNewIssueOpen, setIsNewIssueOpen] = useState(false);
   const [isGithubSyncing, setIsGithubSyncing] = useState(false);
 
+  // Immersive mode (fullscreen) - hide app chrome
+  const isImmersiveMode = useAppStore(selectIsImmersiveMode);
+  const toggleImmersiveMode = useAppStore((s) => s.toggleImmersiveMode);
+
   // Issues data
   const { refetch: refetchIssues, isFetching: isFetchingIssues } = useIssues();
   // Queue data
@@ -392,17 +399,36 @@ export function IssueHubPage() {
   };
 
   return (
-    <div className="space-y-6">
+    <div className={cn("space-y-6", isImmersiveMode && "h-screen overflow-hidden")}>
       {/* Header and action buttons on same row */}
       <div className="flex items-center justify-between">
         <IssueHubHeader currentTab={currentTab} />
 
+        <div className="flex items-center gap-2">
           {/* Action buttons - dynamic based on current tab */}
-        {renderActionButtons() && (
-          <div className="flex gap-2">
           {renderActionButtons()}
-          </div>
+
+          {/* Fullscreen toggle */}
+          <button
+            onClick={toggleImmersiveMode}
+            className={cn(
+              'p-2 rounded-md transition-colors',
+              isImmersiveMode
+                ? 'bg-primary/10 text-primary'
+                : 'text-muted-foreground hover:text-foreground hover:bg-muted'
             )}
+            title={isImmersiveMode
+              ? formatMessage({ id: 'issueHub.exitFullscreen', defaultMessage: 'Exit Fullscreen' })
+              : formatMessage({ id: 'issueHub.fullscreen', defaultMessage: 'Fullscreen' })
+            }
+          >
+            {isImmersiveMode ? (
+              <Minimize2 className="w-4 h-4" />
+            ) : (
+              <Maximize2 className="w-4 h-4" />
+            )}
+          </button>
+        </div>
       </div>
 
       <IssueHubTabs currentTab={currentTab} onTabChange={setCurrentTab} />

ccw/frontend/src/pages/LiteTasksPage.tsx

@@ -45,7 +45,10 @@ import {
   Link2,
   ShieldCheck,
   Settings2,
+  Maximize2,
+  Minimize2,
 } from 'lucide-react';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 import { useLiteTasks } from '@/hooks/useLiteTasks';
 import { Button } from '@/components/ui/Button';
 import { Badge } from '@/components/ui/Badge';
@@ -55,6 +58,7 @@ import { TaskDrawer } from '@/components/shared/TaskDrawer';
 import { fetchLiteSessionContext, type LiteTask, type LiteTaskSession, type LiteSessionContext, type RoundSynthesis, type MultiCliContextPackage } from '@/lib/api';
 import { LiteContextContent } from '@/components/lite-tasks/LiteContextContent';
 import { useNavigate } from 'react-router-dom';
+import { cn } from '@/lib/utils';
 
 type LiteTaskTab = 'lite-plan' | 'lite-fix' | 'multi-cli-plan';
 type SortField = 'date' | 'name' | 'tasks';
@@ -1209,6 +1213,8 @@ export function LiteTasksPage() {
   const [searchQuery, setSearchQuery] = React.useState('');
   const [sortField, setSortField] = React.useState<SortField>('date');
   const [sortOrder, setSortOrder] = React.useState<SortOrder>('desc');
+  const isImmersiveMode = useAppStore(selectIsImmersiveMode);
+  const toggleImmersiveMode = useAppStore((s) => s.toggleImmersiveMode);
 
   // Filter and sort sessions
   const filterAndSort = React.useCallback((sessions: LiteTaskSession[]) => {
@@ -1525,7 +1531,7 @@ export function LiteTasksPage() {
   const totalSessions = litePlan.length + liteFix.length + multiCliPlan.length;
 
   return (
-    <div className="space-y-6">
+    <div className={cn("space-y-6", isImmersiveMode && "h-screen overflow-hidden")}>
       {/* Header */}
       <div className="flex items-center justify-between">
         <div className="flex items-center gap-4">
@@ -1542,6 +1548,18 @@ export function LiteTasksPage() {
             </p>
           </div>
         </div>
+        <button
+          onClick={toggleImmersiveMode}
+          className={cn(
+            'p-2 rounded-md transition-colors',
+            isImmersiveMode
+              ? 'bg-primary/10 text-primary'
+              : 'text-muted-foreground hover:text-foreground hover:bg-muted'
+          )}
+          title={isImmersiveMode ? 'Exit Fullscreen' : 'Fullscreen'}
+        >
+          {isImmersiveMode ? <Minimize2 className="w-4 h-4" /> : <Maximize2 className="w-4 h-4" />}
+        </button>
       </div>
 
       {/* Tabs */}

ccw/frontend/src/pages/MemoryPage.tsx

@@ -28,7 +28,10 @@ import {
   Terminal,
   GitBranch,
   Hash,
+  Maximize2,
+  Minimize2,
 } from 'lucide-react';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 import { Card } from '@/components/ui/Card';
 import { Button } from '@/components/ui/Button';
 import { Input } from '@/components/ui/Input';
@@ -624,6 +627,8 @@ export function MemoryPage() {
   const [currentTab, setCurrentTab] = useState<'memories' | 'favorites' | 'archived' | 'unifiedSearch'>('memories');
   const [unifiedQuery, setUnifiedQuery] = useState('');
   const [selectedCategory, setSelectedCategory] = useState('');
+  const isImmersiveMode = useAppStore(selectIsImmersiveMode);
+  const toggleImmersiveMode = useAppStore((s) => s.toggleImmersiveMode);
 
   const isUnifiedTab = currentTab === 'unifiedSearch';
 
@@ -784,7 +789,7 @@ export function MemoryPage() {
   const activeError = isUnifiedTab ? unifiedError : error;
 
   return (
-    <div className="space-y-6">
+    <div className={cn("space-y-6", isImmersiveMode && "h-screen overflow-hidden")}>
       {/* Page Header */}
       <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
         <div>
@@ -797,6 +802,18 @@ export function MemoryPage() {
           </p>
         </div>
         <div className="flex gap-2">
+          <button
+            onClick={toggleImmersiveMode}
+            className={cn(
+              'p-2 rounded-md transition-colors',
+              isImmersiveMode
+                ? 'bg-primary/10 text-primary'
+                : 'text-muted-foreground hover:text-foreground hover:bg-muted'
+            )}
+            title={isImmersiveMode ? 'Exit Fullscreen' : 'Fullscreen'}
+          >
+            {isImmersiveMode ? <Minimize2 className="w-4 h-4" /> : <Maximize2 className="w-4 h-4" />}
+          </button>
           {isUnifiedTab && (
             <Button
               variant="outline"

ccw/frontend/src/pages/RulesManagerPage.tsx

@@ -16,7 +16,10 @@ import {
   Folder,
   User,
   Globe,
+  Maximize2,
+  Minimize2,
 } from 'lucide-react';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 import {
   useRules,
   useCreateRule,
@@ -64,6 +67,10 @@ export function RulesManagerPage() {
   const [searchQuery, setSearchQuery] = React.useState('');
   const [categoryFilter, setCategoryFilter] = React.useState<string[]>([]);
 
+  // Immersive mode state
+  const isImmersiveMode = useAppStore(selectIsImmersiveMode);
+  const toggleImmersiveMode = useAppStore((s) => s.toggleImmersiveMode);
+
   // Dialog state
   const [createDialogOpen, setCreateDialogOpen] = React.useState(false);
   const [editDialogOpen, setEditDialogOpen] = React.useState(false);
@@ -193,7 +200,7 @@ export function RulesManagerPage() {
     categoryFilter.length > 0 || searchQuery.length > 0;
 
   return (
-    <div className="space-y-6">
+    <div className={cn("space-y-6", isImmersiveMode && "h-screen overflow-hidden")}>
       {/* Header */}
       <div className="flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-between">
         <div>
@@ -203,6 +210,18 @@ export function RulesManagerPage() {
           </p>
         </div>
         <div className="flex items-center gap-2">
+          <button
+            onClick={toggleImmersiveMode}
+            className={cn(
+              'p-2 rounded-md transition-colors',
+              isImmersiveMode
+                ? 'bg-primary/10 text-primary'
+                : 'text-muted-foreground hover:text-foreground hover:bg-muted'
+            )}
+            title={isImmersiveMode ? 'Exit Fullscreen' : 'Fullscreen'}
+          >
+            {isImmersiveMode ? <Minimize2 className="w-4 h-4" /> : <Maximize2 className="w-4 h-4" />}
+          </button>
           <Button
             variant="outline"
             size="sm"

ccw/frontend/src/pages/SessionsPage.tsx

@@ -13,6 +13,8 @@ import {
   AlertCircle,
   FolderKanban,
   X,
+  Maximize2,
+  Minimize2,
 } from 'lucide-react';
 import {
   useSessions,
@@ -43,6 +45,7 @@ import {
 import { TabsNavigation } from '@/components/ui/TabsNavigation';
 import { cn } from '@/lib/utils';
 import type { SessionMetadata } from '@/types/store';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 
 type LocationFilter = 'all' | 'active' | 'archived';
 
@@ -71,6 +74,10 @@ export function SessionsPage() {
   const [deleteDialogOpen, setDeleteDialogOpen] = React.useState(false);
   const [sessionToDelete, setSessionToDelete] = React.useState<string | null>(null);
 
+  // Immersive mode (fullscreen)
+  const isImmersiveMode = useAppStore(selectIsImmersiveMode);
+  const toggleImmersiveMode = useAppStore((s) => s.toggleImmersiveMode);
+
   // Build filter object
   const filter: SessionsFilter = React.useMemo(
     () => ({
@@ -149,7 +156,7 @@ export function SessionsPage() {
   const hasActiveFilters = statusFilter.length > 0 || searchQuery.length > 0;
 
   return (
-    <div className="space-y-6">
+    <div className={cn("space-y-6", isImmersiveMode && "h-screen overflow-hidden")}>
       {/* Header */}
       <div className="flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-between">
         <div>
@@ -168,6 +175,18 @@ export function SessionsPage() {
             <RefreshCw className={cn('h-4 w-4 mr-2', isFetching && 'animate-spin')} />
             {formatMessage({ id: 'common.actions.refresh' })}
           </Button>
+          <button
+            onClick={toggleImmersiveMode}
+            className={cn(
+              'p-2 rounded-md transition-colors',
+              isImmersiveMode
+                ? 'bg-primary/10 text-primary'
+                : 'text-muted-foreground hover:text-foreground hover:bg-muted'
+            )}
+            title={isImmersiveMode ? formatMessage({ id: 'common.exitFullscreen', defaultMessage: 'Exit Fullscreen' }) : formatMessage({ id: 'common.fullscreen', defaultMessage: 'Fullscreen' })}
+          >
+            {isImmersiveMode ? <Minimize2 className="w-4 h-4" /> : <Maximize2 className="w-4 h-4" />}
+          </button>
         </div>
       </div>
 

ccw/frontend/src/pages/SkillsManagerPage.tsx

@@ -21,7 +21,10 @@ import {
   Folder,
   User,
   AlertCircle,
+  Maximize2,
+  Minimize2,
 } from 'lucide-react';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 import { Card } from '@/components/ui/Card';
 import { Button } from '@/components/ui/Button';
 import { Input } from '@/components/ui/Input';
@@ -128,6 +131,10 @@ export function SkillsManagerPage() {
   const [isDetailLoading, setIsDetailLoading] = useState(false);
   const [isDetailPanelOpen, setIsDetailPanelOpen] = useState(false);
 
+  // Immersive mode state
+  const isImmersiveMode = useAppStore(selectIsImmersiveMode);
+  const toggleImmersiveMode = useAppStore((s) => s.toggleImmersiveMode);
+
   const {
     skills,
     categories,
@@ -233,7 +240,7 @@ export function SkillsManagerPage() {
   }, []);
 
   return (
-    <div className="space-y-6">
+    <div className={cn("space-y-6", isImmersiveMode && "h-screen overflow-hidden")}>
       {/* Page Header */}
       <div className="flex flex-col gap-4">
         <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
@@ -256,6 +263,18 @@ export function SkillsManagerPage() {
             </div>
           </div>
           <div className="flex gap-2">
+            <button
+              onClick={toggleImmersiveMode}
+              className={cn(
+                'p-2 rounded-md transition-colors',
+                isImmersiveMode
+                  ? 'bg-primary/10 text-primary'
+                  : 'text-muted-foreground hover:text-foreground hover:bg-muted'
+              )}
+              title={isImmersiveMode ? 'Exit Fullscreen' : 'Fullscreen'}
+            >
+              {isImmersiveMode ? <Minimize2 className="w-4 h-4" /> : <Maximize2 className="w-4 h-4" />}
+            </button>
             <Button variant="outline" onClick={() => refetch()} disabled={isFetching}>
               <RefreshCw className={cn('w-4 h-4 mr-2', isFetching && 'animate-spin')} />
               {formatMessage({ id: 'common.actions.refresh' })}

ccw/frontend/src/pages/TeamPage.tsx

@@ -4,8 +4,10 @@
 // Main page for team execution - list/detail dual view with tabbed detail
 
 import { useIntl } from 'react-intl';
-import { Package, MessageSquare } from 'lucide-react';
+import { Package, MessageSquare, Maximize2, Minimize2 } from 'lucide-react';
 import { Card, CardContent } from '@/components/ui/Card';
+import { cn } from '@/lib/utils';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 import { TabsNavigation, type TabItem } from '@/components/ui/TabsNavigation';
 import { useTeamStore } from '@/stores/teamStore';
 import type { TeamDetailTab } from '@/stores/teamStore';
@@ -33,6 +35,8 @@ export function TeamPage() {
     setDetailTab,
     backToList,
   } = useTeamStore();
+  const isImmersiveMode = useAppStore(selectIsImmersiveMode);
+  const toggleImmersiveMode = useAppStore((s) => s.toggleImmersiveMode);
 
   // Data hooks (only active in detail mode)
   const { messages, total: messageTotal } = useTeamMessages(
@@ -67,8 +71,9 @@ export function TeamPage() {
 
   // Detail view
   return (
-    <div className="p-6 space-y-6">
+    <div className={cn("p-6 space-y-6", isImmersiveMode && "h-screen overflow-hidden")}>
       {/* Detail Header: back button + team name + stats + controls */}
+      <div className="flex items-center justify-between">
         <TeamHeader
           selectedTeam={selectedTeam}
           onBack={backToList}
@@ -77,6 +82,19 @@ export function TeamPage() {
           autoRefresh={autoRefresh}
           onToggleAutoRefresh={toggleAutoRefresh}
         />
+        <button
+          onClick={toggleImmersiveMode}
+          className={cn(
+            'p-2 rounded-md transition-colors',
+            isImmersiveMode
+              ? 'bg-primary/10 text-primary'
+              : 'text-muted-foreground hover:text-foreground hover:bg-muted'
+          )}
+          title={isImmersiveMode ? 'Exit Fullscreen' : 'Fullscreen'}
+        >
+          {isImmersiveMode ? <Minimize2 className="w-4 h-4" /> : <Maximize2 className="w-4 h-4" />}
+        </button>
+      </div>
 
       {/* Overview: Pipeline + Members (always visible) */}
       <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">

ccw/frontend/src/pages/TerminalDashboardPage.tsx

@@ -7,7 +7,7 @@
 // Right sidebar: FileSidebarPanel (file tree, resizable)
 // Top: DashboardToolbar with panel toggles and layout presets
 // Floating panels: Issues, Queue, Inspector (overlay, mutually exclusive)
-// Fullscreen mode: Hides all sidebars for maximum terminal space
+// Fullscreen mode: Uses global isImmersiveMode to hide app chrome (Header + Sidebar)
 
 import { useState, useCallback } from 'react';
 import { useIntl } from 'react-intl';
@@ -24,6 +24,7 @@ import { QueuePanel } from '@/components/terminal-dashboard/QueuePanel';
 import { InspectorContent } from '@/components/terminal-dashboard/BottomInspector';
 import { FileSidebarPanel } from '@/components/terminal-dashboard/FileSidebarPanel';
 import { useWorkflowStore, selectProjectPath } from '@/stores/workflowStore';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 
 // ========== Main Page Component ==========
 
@@ -32,10 +33,13 @@ export function TerminalDashboardPage() {
   const [activePanel, setActivePanel] = useState<PanelId | null>(null);
   const [isFileSidebarOpen, setIsFileSidebarOpen] = useState(true);
   const [isSessionSidebarOpen, setIsSessionSidebarOpen] = useState(true);
-  const [isFullscreen, setIsFullscreen] = useState(false);
 
   const projectPath = useWorkflowStore(selectProjectPath);
 
+  // Use global immersive mode state (only affects AppShell chrome)
+  const isImmersiveMode = useAppStore(selectIsImmersiveMode);
+  const toggleImmersiveMode = useAppStore((s) => s.toggleImmersiveMode);
+
   const togglePanel = useCallback((panelId: PanelId) => {
     setActivePanel((prev) => (prev === panelId ? null : panelId));
   }, []);
@@ -44,17 +48,8 @@ export function TerminalDashboardPage() {
     setActivePanel(null);
   }, []);
 
-  const toggleFullscreen = useCallback(() => {
-    setIsFullscreen((prev) => !prev);
-  }, []);
-
-  // In fullscreen mode, hide all sidebars and panels
-  const showSessionSidebar = isSessionSidebarOpen && !isFullscreen;
-  const showFileSidebar = isFileSidebarOpen && !isFullscreen;
-  const showFloatingPanels = !isFullscreen;
-
   return (
-    <div className={`flex flex-col overflow-hidden ${isFullscreen ? 'h-screen -m-0' : 'h-[calc(100vh-56px)] -m-4 md:-m-6'}`}>
+    <div className={`flex flex-col overflow-hidden ${isImmersiveMode ? 'h-screen' : 'h-[calc(100vh-56px)]'}`}>
       <AssociationHighlightProvider>
         {/* Global toolbar */}
         <DashboardToolbar
@@ -64,15 +59,15 @@ export function TerminalDashboardPage() {
           onToggleFileSidebar={() => setIsFileSidebarOpen((prev) => !prev)}
           isSessionSidebarOpen={isSessionSidebarOpen}
           onToggleSessionSidebar={() => setIsSessionSidebarOpen((prev) => !prev)}
-          isFullscreen={isFullscreen}
+          isFullscreen={isImmersiveMode}
-          onToggleFullscreen={toggleFullscreen}
+          onToggleFullscreen={toggleImmersiveMode}
         />
 
         {/* Main content with three-column layout */}
         <div className="flex-1 min-h-0">
           <Allotment className="h-full">
-            {/* Session sidebar (conditional) */}
+            {/* Session sidebar (controlled by local state, not immersive mode) */}
-            {showSessionSidebar && (
+            {isSessionSidebarOpen && (
               <Allotment.Pane preferredSize={240} minSize={180} maxSize={320}>
                 <div className="h-full flex flex-col border-r border-border">
                   <div className="flex-1 min-h-0 overflow-y-auto">
@@ -90,8 +85,8 @@ export function TerminalDashboardPage() {
               <TerminalGrid />
             </Allotment.Pane>
 
-            {/* File sidebar (conditional, default 280px) */}
+            {/* File sidebar (controlled by local state, not immersive mode) */}
-            {showFileSidebar && (
+            {isFileSidebarOpen && (
               <Allotment.Pane preferredSize={280} minSize={200} maxSize={400}>
                 <FileSidebarPanel
                   rootPath={projectPath ?? '/'}
@@ -103,9 +98,7 @@ export function TerminalDashboardPage() {
           </Allotment>
         </div>
 
-        {/* Floating panels (conditional, overlay) */}
+        {/* Floating panels (always available) */}
-        {showFloatingPanels && (
-          <>
         <FloatingPanel
           isOpen={activePanel === 'issues'}
           onClose={closePanel}
@@ -135,8 +128,6 @@ export function TerminalDashboardPage() {
         >
           <InspectorContent />
         </FloatingPanel>
-          </>
-        )}
       </AssociationHighlightProvider>
     </div>
   );

ccw/frontend/src/pages/orchestrator/FlowToolbar.tsx

@@ -17,6 +17,8 @@ import {
   Library,
   Play,
   Activity,
+  Maximize2,
+  Minimize2,
 } from 'lucide-react';
 import { cn } from '@/lib/utils';
 import { Button } from '@/components/ui/Button';
@@ -24,6 +26,7 @@ import { Input } from '@/components/ui/Input';
 import { useFlowStore, toast } from '@/stores';
 import { useExecutionStore } from '@/stores/executionStore';
 import { useExecuteFlow } from '@/hooks/useFlows';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 import type { Flow } from '@/types/flow';
 
 interface FlowToolbarProps {
@@ -37,6 +40,10 @@ export function FlowToolbar({ className, onOpenTemplateLibrary }: FlowToolbarPro
   const [flowName, setFlowName] = useState('');
   const [isSaving, setIsSaving] = useState(false);
 
+  // Immersive mode state
+  const isImmersiveMode = useAppStore(selectIsImmersiveMode);
+  const toggleImmersiveMode = useAppStore((s) => s.toggleImmersiveMode);
+
   // Flow store
   const currentFlow = useFlowStore((state) => state.currentFlow);
   const isModified = useFlowStore((state) => state.isModified);
@@ -363,6 +370,22 @@ export function FlowToolbar({ className, onOpenTemplateLibrary }: FlowToolbarPro
           )}
           {formatMessage({ id: 'orchestrator.toolbar.runWorkflow' })}
         </Button>
+
+        <div className="w-px h-6 bg-border" />
+
+        {/* Fullscreen Toggle */}
+        <button
+          onClick={toggleImmersiveMode}
+          className={cn(
+            'p-2 rounded-md transition-colors',
+            isImmersiveMode
+              ? 'bg-primary/10 text-primary'
+              : 'text-muted-foreground hover:text-foreground hover:bg-muted'
+          )}
+          title={isImmersiveMode ? 'Exit Fullscreen' : 'Fullscreen'}
+        >
+          {isImmersiveMode ? <Minimize2 className="w-4 h-4" /> : <Maximize2 className="w-4 h-4" />}
+        </button>
       </div>
     </div>
   );

ccw/frontend/src/pages/orchestrator/OrchestratorPage.tsx

@@ -5,8 +5,9 @@
 
 import { useEffect, useState, useCallback } from 'react';
 import * as Collapsible from '@radix-ui/react-collapsible';
-import { ChevronRight } from 'lucide-react';
+import { ChevronRight, Maximize2, Minimize2 } from 'lucide-react';
 import { useFlowStore } from '@/stores';
+import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
 import { useExecutionStore } from '@/stores/executionStore';
 import { Button } from '@/components/ui/Button';
 import { FlowCanvas } from './FlowCanvas';

ccw/frontend/src/stores/appStore.ts

@@ -236,6 +236,9 @@ const initialState = {
   themeSlots: [DEFAULT_SLOT] as ThemeSlot[],
   activeSlotId: 'default' as ThemeSlotId,
   deletedSlotBuffer: null as ThemeSlot | null,
+
+  // Immersive fullscreen mode (hides app shell chrome)
+  isImmersiveMode: false,
 };
 
 export const useAppStore = create<AppStore>()(
@@ -670,6 +673,16 @@ export const useAppStore = create<AppStore>()(
           }
           get().setBackgroundConfig(updated);
         },
+
+        // ========== Immersive Mode Actions ==========
+
+        setImmersiveMode: (enabled: boolean) => {
+          set({ isImmersiveMode: enabled }, false, 'setImmersiveMode');
+        },
+
+        toggleImmersiveMode: () => {
+          set((state) => ({ isImmersiveMode: !state.isImmersiveMode }), false, 'toggleImmersiveMode');
+        },
       }),
       {
         name: 'ccw-app-store',
@@ -807,3 +820,4 @@ export const selectError = (state: AppStore) => state.error;
 export const selectThemeSlots = (state: AppStore) => state.themeSlots;
 export const selectActiveSlotId = (state: AppStore) => state.activeSlotId;
 export const selectDeletedSlotBuffer = (state: AppStore) => state.deletedSlotBuffer;
+export const selectIsImmersiveMode = (state: AppStore) => state.isImmersiveMode;

ccw/frontend/src/types/store.ts

@@ -117,6 +117,9 @@ export interface AppState {
   themeSlots: ThemeSlot[];
   activeSlotId: ThemeSlotId;
   deletedSlotBuffer: ThemeSlot | null;
+
+  // Immersive mode (fullscreen)
+  isImmersiveMode: boolean;
 }
 
 export interface AppActions {
@@ -170,6 +173,10 @@ export interface AppActions {
   updateBackgroundEffect: <K extends keyof BackgroundEffects>(key: K, value: BackgroundEffects[K]) => void;
   setBackgroundMode: (mode: BackgroundMode) => void;
   setBackgroundImage: (url: string | null, attribution: UnsplashAttribution | null) => void;
+
+  // Immersive mode actions
+  setImmersiveMode: (enabled: boolean) => void;
+  toggleImmersiveMode: () => void;
 }
 
 export type AppStore = AppState & AppActions;