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diff --git a/src/App.tsx b/src/App.tsx
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+import { useState, useEffect } from 'react';
+import { useWorkspace } from './hooks/useWorkspace';
+import { usePackages } from './hooks/usePackages';
+import { useSettings } from './hooks/useSettings';
+import type { PackageSlot } from './hooks/usePackages';
+import { InputPanel } from './components/InputPanel';
+import { PreviewPanel } from './components/PreviewPanel';
+import { PackageSwitcher } from './components/PackageSwitcher';
+import { SettingsPanel } from './components/SettingsPanel';
+import type { BrandOutputs } from './types';
+
+interface WorkspaceShellProps {
+  storageKey: string;
+  slots: PackageSlot[];
+  activeId: string;
+  onSwitch: (id: string) => void;
+  onCreate: () => void;
+  onRemove: (id: string) => void;
+  onRename: (id: string, name: string) => void;
+  onDuplicate: (id: string) => void;
+  onOpenSettings: () => void;
+  aiEnabled: boolean;
+}
+
+function WorkspaceShell({
+  storageKey, slots, activeId,
+  onSwitch, onCreate, onRemove, onRename, onDuplicate,
+  onOpenSettings, aiEnabled,
+}: WorkspaceShellProps) {
+  const {
+    inputs, setInputs, outputs, isGenerating, generateMode, generateError,
+    locked, runGenerate, cancelGenerate, updateEdit, toggleLock,
+    undo, redo, canUndo, canRedo,
+  } = useWorkspace(storageKey);
+
+  useEffect(() => {
+    const handler = (e: KeyboardEvent) => {
+      if (!(e.metaKey || e.ctrlKey) || e.key !== 'z') return;
+      e.preventDefault();
+      if (e.shiftKey) redo();
+      else undo();
+    };
+    window.addEventListener('keydown', handler);
+    return () => window.removeEventListener('keydown', handler);
+  }, [undo, redo]);
+
+  const handleEdit = <K extends keyof BrandOutputs>(key: K, value: BrandOutputs[K]) =>
+    updateEdit(key, value);
+
+  const generateLabel = isGenerating
+    ? 'Cancel'
+    : outputs
+      ? (aiEnabled ? `Regenerate` : 'Regenerate')
+      : (aiEnabled ? 'Generate with AI' : 'Generate');
+
+  return (
+    <>
+      <header className="app-header">
+        <div className="app-header-left">
+          <span className="app-wordmark">Brand<span>bench</span></span>
+          <PackageSwitcher
+            slots={slots} activeId={activeId}
+            onSwitch={onSwitch} onCreate={onCreate}
+            onRemove={onRemove} onRename={onRename} onDuplicate={onDuplicate}
+          />
+        </div>
+        <div className="app-header-right">
+          {outputs && (
+            <>
+              <button className="btn btn-ghost" onClick={undo} disabled={!canUndo} title="Undo (⌘Z)">Undo</button>
+              <button className="btn btn-ghost" onClick={redo} disabled={!canRedo} title="Redo (⌘⇧Z)">Redo</button>
+            </>
+          )}
+          {aiEnabled && (
+            <span className="ai-badge" title={`AI mode: ${generateMode}`}>AI</span>
+          )}
+          <button className="btn btn-ghost settings-open-btn" onClick={onOpenSettings} title="Settings">⚙</button>
+        </div>
+      </header>
+
+      <div className="app-shell">
+        <InputPanel
+          inputs={inputs}
+          onChange={setInputs}
+          onGenerate={isGenerating ? cancelGenerate : runGenerate}
+          isGenerating={isGenerating}
+          generateLabel={generateLabel}
+        />
+        <PreviewPanel
+          inputs={inputs}
+          outputs={outputs}
+          locked={locked}
+          onToggleLock={toggleLock}
+          onEdit={handleEdit}
+          isGenerating={isGenerating}
+          generateMode={generateMode}
+          generateError={generateError}
+          onGenerate={runGenerate}
+        />
+      </div>
+    </>
+  );
+}
+
+export default function App() {
+  const { slots, activeId, activeSlot, switchTo, createNew, remove, rename, duplicate } = usePackages();
+  const { settings, setSettings } = useSettings();
+  const [settingsOpen, setSettingsOpen] = useState(false);
+
+  return (
+    <>
+      <WorkspaceShell
+        key={activeId}
+        storageKey={activeSlot.storageKey}
+        slots={slots} activeId={activeId}
+        onSwitch={switchTo} onCreate={createNew}
+        onRemove={remove} onRename={rename} onDuplicate={duplicate}
+        onOpenSettings={() => setSettingsOpen(true)}
+        aiEnabled={settings.enabled}
+      />
+      {settingsOpen && (
+        <SettingsPanel
+          settings={settings}
+          onChange={setSettings}
+          onClose={() => setSettingsOpen(false)}
+        />
+      )}
+    </>
+  );
+}