Generated by Spark: Add preview button to toolbar

src/App.tsx

@@ -37,6 +37,7 @@ const componentMap: Record<string, React.LazyExoticComponent<any>> = {
 
 const GlobalSearch = lazy(() => import('@/components/GlobalSearch').then(m => ({ default: m.GlobalSearch })))
 const KeyboardShortcutsDialog = lazy(() => import('@/components/KeyboardShortcutsDialog').then(m => ({ default: m.KeyboardShortcutsDialog })))
+const PreviewDialog = lazy(() => import('@/components/PreviewDialog').then(m => ({ default: m.PreviewDialog })))
 const PWAInstallPrompt = lazy(() => import('@/components/PWAInstallPrompt').then(m => ({ default: m.PWAInstallPrompt })))
 const PWAUpdatePrompt = lazy(() => import('@/components/PWAUpdatePrompt').then(m => ({ default: m.PWAUpdatePrompt })))
 const PWAStatusBar = lazy(() => import('@/components/PWAStatusBar').then(m => ({ default: m.PWAStatusBar })))
@@ -81,6 +82,7 @@ function App() {
   const [activeTab, setActiveTab] = useState('dashboard')
   const [searchOpen, setSearchOpen] = useState(false)
   const [shortcutsOpen, setShortcutsOpen] = useState(false)
+  const [previewOpen, setPreviewOpen] = useState(false)
   const [lastSaved] = useState<number | null>(Date.now())
   const [errorCount] = useState(0)
   const [appReady, setAppReady] = useState(false)
@@ -116,6 +118,7 @@ function App() {
     })),
     { key: 'k', ctrl: true, description: 'Search', action: () => setSearchOpen(true) },
     { key: '/', ctrl: true, description: 'Shortcuts', action: () => setShortcutsOpen(true) },
+    { key: 'p', ctrl: true, description: 'Preview', action: () => setPreviewOpen(true) },
   ])
 
   const getCurrentProject = () => ({
@@ -324,6 +327,7 @@ function App() {
         onShowShortcuts={() => setShortcutsOpen(true)}
         onGenerateAI={() => toast.info('AI generation coming soon')}
         onExport={() => toast.info('Export coming soon')}
+        onPreview={() => setPreviewOpen(true)}
         onShowErrors={() => setActiveTab('errors')}
       />
       <Tabs value={activeTab} onValueChange={setActiveTab} className="flex-1 flex flex-col">
@@ -358,6 +362,9 @@ function App() {
       <Suspense fallback={null}>
         <KeyboardShortcutsDialog open={shortcutsOpen} onOpenChange={setShortcutsOpen} />
       </Suspense>
+      <Suspense fallback={null}>
+        <PreviewDialog open={previewOpen} onOpenChange={setPreviewOpen} />
+      </Suspense>
       <Suspense fallback={null}>
         <PWAInstallPrompt />
       </Suspense>

src/components/PreviewDialog.tsx

@@ -0,0 +1,67 @@
+import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog'
+import { Button } from '@/components/ui/button'
+import { X, ArrowSquareOut } from '@phosphor-icons/react'
+import { useEffect, useState } from 'react'
+
+interface PreviewDialogProps {
+  open: boolean
+  onOpenChange: (open: boolean) => void
+}
+
+export function PreviewDialog({ open, onOpenChange }: PreviewDialogProps) {
+  const [previewUrl, setPreviewUrl] = useState<string>('')
+
+  useEffect(() => {
+    if (open) {
+      const currentUrl = window.location.href
+      const url = new URL(currentUrl)
+      url.searchParams.set('preview', 'true')
+      setPreviewUrl(url.toString())
+    }
+  }, [open])
+
+  const handleOpenInNewTab = () => {
+    if (previewUrl) {
+      window.open(previewUrl, '_blank', 'noopener,noreferrer')
+    }
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="max-w-[95vw] w-[95vw] h-[90vh] p-0 gap-0">
+        <DialogHeader className="px-6 py-4 border-b border-border flex flex-row items-center justify-between space-y-0">
+          <DialogTitle className="text-lg font-semibold">Preview</DialogTitle>
+          <div className="flex gap-2">
+            <Button
+              variant="outline"
+              size="sm"
+              onClick={handleOpenInNewTab}
+              className="gap-2"
+            >
+              <ArrowSquareOut size={16} />
+              Open in New Tab
+            </Button>
+            <Button
+              variant="ghost"
+              size="sm"
+              onClick={() => onOpenChange(false)}
+              className="h-8 w-8 p-0"
+            >
+              <X size={20} />
+            </Button>
+          </div>
+        </DialogHeader>
+        <div className="flex-1 w-full h-full overflow-hidden">
+          {previewUrl && (
+            <iframe
+              src={previewUrl}
+              className="w-full h-full border-0"
+              title="Preview"
+              sandbox="allow-scripts allow-same-origin allow-forms allow-popups allow-modals"
+            />
+          )}
+        </div>
+      </DialogContent>
+    </Dialog>
+  )
+}

src/components/organisms/AppHeader.tsx

@@ -16,6 +16,7 @@ interface AppHeaderProps {
   onShowShortcuts: () => void
   onGenerateAI: () => void
   onExport: () => void
+  onPreview?: () => void
   onShowErrors: () => void
 }
 
@@ -31,6 +32,7 @@ export function AppHeader({
   onShowShortcuts,
   onGenerateAI,
   onExport,
+  onPreview,
   onShowErrors,
 }: AppHeaderProps) {
   return (
@@ -56,6 +58,7 @@ export function AppHeader({
             onShowShortcuts={onShowShortcuts}
             onGenerateAI={onGenerateAI}
             onExport={onExport}
+            onPreview={onPreview}
             onShowErrors={onShowErrors}
             errorCount={errorCount}
             showErrorButton={featureToggles.errorRepair && errorCount > 0}

src/components/organisms/ToolbarActions.tsx

@@ -6,6 +6,7 @@ import {
   Sparkle,
   Download,
   Wrench,
+  Eye,
 } from '@phosphor-icons/react'
 
 interface ToolbarActionsProps {
@@ -13,6 +14,7 @@ interface ToolbarActionsProps {
   onShowShortcuts: () => void
   onGenerateAI: () => void
   onExport: () => void
+  onPreview?: () => void
   onShowErrors?: () => void
   errorCount?: number
   showErrorButton?: boolean
@@ -23,6 +25,7 @@ export function ToolbarActions({
   onShowShortcuts,
   onGenerateAI,
   onExport,
+  onPreview,
   onShowErrors,
   errorCount = 0,
   showErrorButton = false,
@@ -48,6 +51,15 @@ export function ToolbarActions({
         </div>
       )}
 
+      {onPreview && (
+        <ToolbarButton
+          icon={<Eye size={18} />}
+          label="Preview (Ctrl+P)"
+          onClick={onPreview}
+          variant="outline"
+        />
+      )}
+
       <ToolbarButton
         icon={<Keyboard size={18} />}
         label="Keyboard Shortcuts (Ctrl+/)"