UI: Implement Maximize mode for tables. Added a 'MAXIMIZE' button to TopBar and an 'X' close button in fullscreen mode. Hides sidebar and header to provide maximum screen space for data tables.

src/App.tsx

@@ -523,6 +523,8 @@ export default function App() {
     };
   }, [appState.data]);
 
+  const [isMaximized, setIsMaximized] = useState(false);
+
   if (!session) {
     return <LoginPage onLogin={() => {
       const stored = getStoredSession();
@@ -534,28 +536,49 @@ export default function App() {
   return (
     <ColumnsProvider headers={appState.headers}>
       <div className="h-screen bg-[#040d1a] text-slate-200 flex flex-col font-sans overflow-hidden">
-      <TopBar
-        stats={stats}
-        activeModule={activeModule}
-        onExport={handleExport}
-        onRefresh={() => { setRefreshTrigger(t => t + 1); }}
-        hasData={appState.data.length > 0}
-        hasUnsavedChanges={appState.hasUnsavedChanges}
-        userEmail={session.user.email}
-        onSignOut={handleSignOut}
-        canUndo={undoHistory.length > 0}
-        onUndo={handleUndo}
-        undoMessage={undoHistory[0]?.message}
-        undoSteps={undoHistory.length}
-        pendingCount={Object.keys(pendingRows).length}
-        pendingChanges={Object.fromEntries(Object.entries(pendingRows).map(([k, v]) => [k, { articleName: (v as any).articleName }]))}
-        onSaveAll={handleSaveAll}
-        onRevertRow={handleRevertRow}
-        isSavingAll={isSavingAll}
-      />
+      {!isMaximized && (
+        <TopBar
+          stats={stats}
+          activeModule={activeModule}
+          onExport={handleExport}
+          onRefresh={() => { setRefreshTrigger(t => t + 1); }}
+          hasData={appState.data.length > 0}
+          hasUnsavedChanges={appState.hasUnsavedChanges}
+          userEmail={session.user.email}
+          onSignOut={handleSignOut}
+          canUndo={undoHistory.length > 0}
+          onUndo={handleUndo}
+          undoMessage={undoHistory[0]?.message}
+          undoSteps={undoHistory.length}
+          pendingCount={Object.keys(pendingRows).length}
+          pendingChanges={Object.fromEntries(Object.entries(pendingRows).map(([k, v]) => [k, { articleName: (v as any).articleName }]))}
+          onSaveAll={handleSaveAll}
+          onRevertRow={handleRevertRow}
+          isSavingAll={isSavingAll}
+          isMaximized={isMaximized}
+          onToggleMaximize={() => setIsMaximized(true)}
+        />
+      )}
       <div className="flex flex-1 overflow-hidden">
-        <Sidebar activeModule={activeModule} setActiveModule={setActiveModule} userEmail={session.user.email} />
-        <main className="flex-1 overflow-auto relative p-6 bg-[#041021]">
+        {!isMaximized && (
+          <Sidebar activeModule={activeModule} setActiveModule={setActiveModule} userEmail={session.user.email} />
+        )}
+        <main className={cn(
+          "flex-1 overflow-auto relative bg-[#041021] transition-all duration-300",
+          isMaximized ? "p-0" : "p-6"
+        )}>
+          {isMaximized && (
+            <button
+              onClick={() => setIsMaximized(false)}
+              className="fixed top-4 right-4 z-[100] p-3 bg-slate-800 hover:bg-slate-700 text-slate-400 hover:text-white rounded-full shadow-2xl border border-slate-700 transition-all active:scale-95 group"
+              title="Exit Fullscreen"
+            >
+              <X className="w-6 h-6" />
+              <span className="absolute right-full mr-2 top-1/2 -translate-y-1/2 px-2 py-1 bg-slate-900 text-xs text-white rounded opacity-0 group-hover:opacity-100 transition-opacity whitespace-nowrap">
+                Exit Fullscreen
+              </span>
+            </button>
+          )}
           {isLoadingDefault ? (
             <div className="flex flex-col items-center justify-center h-full text-slate-400">
               <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-500 mb-4"></div>

src/components/ProductDescriptions.tsx

@@ -1,7 +1,7 @@
 import React, { useState, useMemo } from 'react';
 import { ExcelRow } from '../types';
 import { useColumns } from '../contexts/ColumnsContext';
-import { Search, Filter, Edit2, ChevronDown, ChevronUp, X } from 'lucide-react';
+import { Search, Filter, Edit2, ChevronDown, ChevronUp, X, Maximize2 } from 'lucide-react';
 import { cn } from '../lib/utils';
 import { ColumnFilterPopover } from './ColumnFilterPopover';
 
@@ -15,6 +15,7 @@ interface ProductDescriptionsProps {
 
 export function ProductDescriptions({ data, headers, asinColumnIndex, onEdit, rowStatuses }: ProductDescriptionsProps) {
   const COLUMNS = useColumns();
+  const [isFullscreen, setIsFullscreen] = useState(false);
 
   // Description columns that should only have Present/Missing filters
   const DESCRIPTION_COLUMNS = [COLUMNS.LONG_DE, COLUMNS.LONG_EN, COLUMNS.SHORT_DE, COLUMNS.SHORT_EN, COLUMNS.DETAILS_DE, COLUMNS.DETAILS_EN];

src/components/TopBar.tsx

@@ -1,5 +1,5 @@
 import React, { useState, useRef, useEffect } from 'react';
-import { Download, LogOut, Undo2, CloudUpload, Loader2, ChevronDown, RotateCcw } from 'lucide-react';
+import { Download, LogOut, Undo2, CloudUpload, Loader2, ChevronDown, RotateCcw, Maximize2, X } from 'lucide-react';
 import { cn } from '../lib/utils';
 
 interface TopBarProps {
@@ -20,9 +20,11 @@ interface TopBarProps {
   onSaveAll: () => Promise<void>;
   onRevertRow: (articleNo: string) => void;
   isSavingAll: boolean;
+  isMaximized: boolean;
+  onToggleMaximize: () => void;
 }
 
-export function TopBar({ stats, activeModule, onExport, onRefresh, hasData, hasUnsavedChanges, userEmail, onSignOut, canUndo, onUndo, undoMessage, undoSteps, pendingCount, pendingChanges, onSaveAll, onRevertRow, isSavingAll }: TopBarProps) {
+export function TopBar({ stats, activeModule, onExport, onRefresh, hasData, hasUnsavedChanges, userEmail, onSignOut, canUndo, onUndo, undoMessage, undoSteps, pendingCount, pendingChanges, onSaveAll, onRevertRow, isSavingAll, isMaximized, onToggleMaximize }: TopBarProps) {
   const [showPending, setShowPending] = useState(false);
   const dropdownRef = useRef<HTMLDivElement>(null);
 
@@ -179,6 +181,15 @@ export function TopBar({ stats, activeModule, onExport, onRefresh, hasData, hasU
           </button>
         )}
 
+        <button
+          onClick={onToggleMaximize}
+          className="flex items-center gap-2 px-4 py-2 rounded-md text-sm font-medium bg-slate-700 hover:bg-slate-600 text-slate-200 transition-colors"
+          title="Maximize - View table in full screen"
+        >
+          <Maximize2 className="w-4 h-4" />
+          MAXIMIZE
+        </button>
+
         <button
           onClick={onUndo}
           disabled={!canUndo}