feat: complete master feature parity with interactive PDF editing, Reveal.js export dialog, Large File Mode, and scoped CSS

src/main/files/binary.js

@@ -8,6 +8,11 @@ function register() {
     await fs.writeFile(filePath, Buffer.from(buffer));
     return { ok: true };
   });
+
+  ipcMain.handle('read-buffer', async (_event, { path: filePath }) => {
+    const data = await fs.readFile(filePath);
+    return { ok: true, data };
+  });
 }
 
 module.exports = { register };

src/preload.js

@@ -99,6 +99,7 @@ const ALLOWED_SEND_CHANNELS = [
   'read-file',
   'write-file',
   'write-buffer',
+  'read-buffer',
   'delete-file',
   'ensure-directory',
   'path-exists',
@@ -356,6 +357,8 @@ contextBridge.exposeInMainWorld('electronAPI', {
     rendererReady: () => ipcRenderer.send('renderer-ready'),
     read: (filePath) => ipcRenderer.invoke('read-file', filePath),
     write: (filePath, content) => ipcRenderer.invoke('write-file', { path: filePath, content }),
+    readBuffer: (filePath) => ipcRenderer.invoke('read-buffer', { path: filePath }),
+    writeBuffer: (filePath, buffer) => ipcRenderer.invoke('write-buffer', { path: filePath, buffer }),
     delete: (filePath) => ipcRenderer.invoke('delete-file', filePath),
     ensureDir: (dirPath) => ipcRenderer.invoke('ensure-directory', dirPath),
     exists: (filePath) => ipcRenderer.invoke('path-exists', filePath),

src/renderer/App.tsx

@@ -10,10 +10,65 @@ import { FirstRunWizard } from './components/FirstRunWizard';
 import { useWelcomeTrigger } from './hooks/use-welcome-trigger';
 import { useAutoUpdateCheck } from './hooks/useAutoUpdateCheck';
 
+import { useSettingsStore } from './stores/settings-store';
+import { ipc } from './lib/ipc';
+import { toast } from './lib/toast';
+
+function scopeCSS(cssText: string, scopeSelector: string) {
+  if (!cssText) return '';
+  return cssText.replace(/([^\r\n,{}]+)(,(?=[^}]*{)|(?=[^{]*{))/g, (match, selector, separator) => {
+    const trimmed = selector.trim();
+    if (
+      !trimmed ||
+      trimmed.startsWith('@') ||
+      trimmed.startsWith(':root') ||
+      trimmed.startsWith('from') ||
+      trimmed.startsWith('to') ||
+      /^\d+%$/.test(trimmed)
+    ) {
+      return match;
+    }
+    return scopeSelector + ' ' + trimmed + (separator || '');
+  });
+}
+
 function App() {
   useWelcomeTrigger();
   useAutoUpdateCheck();
   const [printOpen, setPrintOpen] = useState(false);
+  const customCssPath = useSettingsStore((s) => s.customCssPath);
+
+  useEffect(() => {
+    let active = true;
+    const styleId = 'custom-preview-style';
+
+    async function applyCSS() {
+      if (!customCssPath) {
+        const styleTag = document.getElementById(styleId);
+        if (styleTag) styleTag.remove();
+        return;
+      }
+
+      const r = await ipc.file.read(customCssPath);
+      if (!active) return;
+      if (r.ok && r.data) {
+        let styleTag = document.getElementById(styleId);
+        if (!styleTag) {
+          styleTag = document.createElement('style');
+          styleTag.id = styleId;
+          document.head.appendChild(styleTag);
+        }
+        styleTag.textContent = scopeCSS(r.data, '.preview-content');
+      } else {
+        toast.error('Failed to load custom CSS file');
+      }
+    }
+
+    void applyCSS();
+    return () => {
+      active = false;
+    };
+  }, [customCssPath]);
 
   useEffect(() => {
     window.electronAPI?.file?.rendererReady?.();

src/renderer/components/editor/EditorPane.tsx

@@ -1,16 +1,43 @@
-import { useEffect } from 'react';
+import { useEffect, useRef } from 'react';
 import { CodeMirrorEditor } from './CodeMirrorEditor';
 import { FindReplaceBar } from './FindReplaceBar';
 import { useEditorStore } from '@/stores/editor-store';
 import { usePreviewStore } from '@/stores/preview-store';
+import { useAppStore } from '@/stores/app-store';
+import { toast } from '@/lib/toast';
 
 export function EditorPane() {
   const { buffers, activeId } = useEditorStore();
   const buf = activeId ? buffers.get(activeId) : null;
   const setPreviewSource = usePreviewStore((s) => s.setSource);
+  const lastActiveId = useRef<string | null>(null);
 
   useEffect(() => {
-    if (buf) setPreviewSource(buf.content);
+    if (!buf) return;
+    const isNewFile = lastActiveId.current !== buf.id;
+    lastActiveId.current = buf.id;
+
+    const isLarge = buf.content.length > 1024 * 1024;
+
+    if (isLarge) {
+      if (!usePreviewStore.getState().largeFileMode) {
+        usePreviewStore.setState({ largeFileMode: true });
+        useAppStore.setState({ previewVisible: false });
+        toast.warning(
+          'Large content detected (>1MB). Large File Mode enabled to maintain peak responsiveness. Live preview auto-render is disabled.'
+        );
+      }
+
+      // Only render on initial load / tab switch, not on edits
+      if (isNewFile) {
+        usePreviewStore.getState().forceRender(buf.content);
+      }
+    } else {
+      if (usePreviewStore.getState().largeFileMode) {
+        usePreviewStore.setState({ largeFileMode: false });
+      }
+      setPreviewSource(buf.content);
+    }
   }, [buf?.id, buf?.content, buf, setPreviewSource]);
 
   if (!buf) {

src/renderer/components/modals/ExportRevealjsDialog.tsx

@@ -0,0 +1,275 @@
+import { useState } from 'react';
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+} from '@/components/ui/dialog';
+import { Checkbox } from '@/components/ui/checkbox';
+import { Label } from '@/components/ui/label';
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from '@/components/ui/select';
+import { Input } from '@/components/ui/input';
+import { Switch } from '@/components/ui/switch';
+import { useAppStore } from '@/stores/app-store';
+import { useExportSource } from '@/hooks/use-export-source';
+import { ipc } from '@/lib/ipc';
+import { toast } from '@/lib/toast';
+import { ExportDialogFooter } from './ExportDialogFooter';
+
+export function ExportRevealjsDialog({ sourcePath }: { sourcePath: string }) {
+  const closeModal = useAppStore((s) => s.closeModal);
+  const source = useExportSource();
+
+  const [revealTheme, setRevealTheme] = useState('black');
+  const [revealTransition, setRevealTransition] = useState('slide');
+  const [revealTransitionSpeed, setRevealTransitionSpeed] = useState('default');
+  const [revealSlideNumber, setRevealSlideNumber] = useState(false);
+  const [revealControls, setRevealControls] = useState(true);
+  const [revealProgress, setRevealProgress] = useState(true);
+  const [revealHistory, setRevealHistory] = useState(true);
+  const [revealCenter, setRevealCenter] = useState(true);
+
+  const [template, setTemplate] = useState('default');
+  const [title, setTitle] = useState(source?.title || '');
+  const [author, setAuthor] = useState('');
+  const [date, setDate] = useState('');
+  const [bibliography, setBibliography] = useState('');
+  const [csl, setCsl] = useState('');
+
+  const [submitting, setSubmitting] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  const handleBrowseFile = async (setter: (v: string) => void) => {
+    const result = await ipc.file.pickFile();
+    if (result.ok && result.data) {
+      setter(result.data);
+    }
+  };
+
+  const handleSubmit = async () => {
+    if (!source) {
+      setError('No file open.');
+      return;
+    }
+    setSubmitting(true);
+    setError(null);
+
+    try {
+      const options = {
+        revealTheme,
+        revealTransition,
+        revealTransitionSpeed,
+        revealSlideNumber,
+        revealControls,
+        revealProgress,
+        revealHistory,
+        revealCenter,
+        template: template || undefined,
+        metadata: {
+          title: title || undefined,
+          author: author || undefined,
+          date: date || undefined,
+        },
+        bibliography: bibliography || undefined,
+        csl: csl || undefined,
+      };
+
+      await window.electronAPI?.export?.withOptions?.('revealjs', options);
+      toast.success('Slide export process completed');
+      closeModal();
+    } catch (err) {
+      const msg = err instanceof Error ? err.message : String(err);
+      toast.error(`Export failed: ${msg}`);
+      setError(msg);
+      setSubmitting(false);
+    }
+  };
+
+  return (
+    <Dialog open onOpenChange={(o) => !o && closeModal()}>
+      <DialogContent className="max-h-[85vh] max-w-lg overflow-y-auto">
+        <DialogHeader>
+          <DialogTitle>Export Reveal.js Slides</DialogTitle>
+          <DialogDescription>{sourcePath}</DialogDescription>
+        </DialogHeader>
+
+        <div className="space-y-4 text-sm">
+          {/* Theme & Transitions */}
+          <div className="grid grid-cols-2 gap-3">
+            <div>
+              <Label htmlFor="reveal-theme">Theme</Label>
+              <Select value={revealTheme} onValueChange={setRevealTheme}>
+                <SelectTrigger id="reveal-theme">
+                  <SelectValue />
+                </SelectTrigger>
+                <SelectContent>
+                  {['black', 'white', 'league', 'beige', 'sky', 'night', 'serif', 'simple', 'solarized', 'blood', 'moon'].map((t) => (
+                    <SelectItem key={t} value={t}>
+                      {t.charAt(0).toUpperCase() + t.slice(1)}
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+            </div>
+
+            <div>
+              <Label htmlFor="reveal-transition">Transition</Label>
+              <Select value={revealTransition} onValueChange={setRevealTransition}>
+                <SelectTrigger id="reveal-transition">
+                  <SelectValue />
+                </SelectTrigger>
+                <SelectContent>
+                  {['slide', 'none', 'fade', 'convex', 'concave', 'zoom'].map((t) => (
+                    <SelectItem key={t} value={t}>
+                      {t.charAt(0).toUpperCase() + t.slice(1)}
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+            </div>
+          </div>
+
+          <div>
+            <Label htmlFor="reveal-speed">Transition Speed</Label>
+            <Select value={revealTransitionSpeed} onValueChange={setRevealTransitionSpeed}>
+              <SelectTrigger id="reveal-speed">
+                <SelectValue />
+              </SelectTrigger>
+              <SelectContent>
+                {['default', 'fast', 'slow'].map((s) => (
+                  <SelectItem key={s} value={s}>
+                    {s.charAt(0).toUpperCase() + s.slice(1)}
+                  </SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+          </div>
+
+          {/* Toggle Switches */}
+          <div className="grid grid-cols-2 gap-x-4 gap-y-2 py-2">
+            <div className="flex items-center gap-2">
+              <Switch checked={revealSlideNumber} onCheckedChange={setRevealSlideNumber} id="reveal-slide-number" />
+              <Label htmlFor="reveal-slide-number">Slide Numbers</Label>
+            </div>
+
+            <div className="flex items-center gap-2">
+              <Switch checked={revealControls} onCheckedChange={setRevealControls} id="reveal-controls" />
+              <Label htmlFor="reveal-controls">Controls</Label>
+            </div>
+
+            <div className="flex items-center gap-2">
+              <Switch checked={revealProgress} onCheckedChange={setRevealProgress} id="reveal-progress" />
+              <Label htmlFor="reveal-progress">Progress Bar</Label>
+            </div>
+
+            <div className="flex items-center gap-2">
+              <Switch checked={revealHistory} onCheckedChange={setRevealHistory} id="reveal-history" />
+              <Label htmlFor="reveal-history">Slide History</Label>
+            </div>
+
+            <div className="flex items-center gap-2 col-span-2">
+              <Switch checked={revealCenter} onCheckedChange={setRevealCenter} id="reveal-center" />
+              <Label htmlFor="reveal-center">Center Content Vertically</Label>
+            </div>
+          </div>
+
+          {/* Template & Metadata */}
+          <div className="border-t pt-3 space-y-3">
+            <Label className="font-semibold text-xs text-muted-foreground uppercase tracking-wider block">Metadata & Template</Label>
+
+            <div>
+              <Label htmlFor="reveal-template">Template File</Label>
+              <div className="flex gap-2">
+                <Input
+                  id="reveal-template"
+                  value={template}
+                  onChange={(e) => setTemplate(e.target.value)}
+                  placeholder="default"
+                  className="flex-1"
+                />
+                <Button variant="outline" size="sm" onClick={() => handleBrowseFile(setTemplate)}>
+                  Browse
+                </Button>
+              </div>
+            </div>
+
+            <div className="grid grid-cols-3 gap-2">
+              <div>
+                <Label htmlFor="reveal-title">Title</Label>
+                <Input id="reveal-title" value={title} onChange={(e) => setTitle(e.target.value)} />
+              </div>
+              <div>
+                <Label htmlFor="reveal-author">Author</Label>
+                <Input id="reveal-author" value={author} onChange={(e) => setAuthor(e.target.value)} />
+              </div>
+              <div>
+                <Label htmlFor="reveal-date">Date</Label>
+                <Input id="reveal-date" value={date} onChange={(e) => setDate(e.target.value)} />
+              </div>
+            </div>
+          </div>
+
+          {/* Bibliography & CSL */}
+          <div className="border-t pt-3 space-y-3">
+            <Label className="font-semibold text-xs text-muted-foreground uppercase tracking-wider block">Bibliography (Pandoc)</Label>
+
+            <div>
+              <Label htmlFor="reveal-bibliography">Bibliography (.bib, .json)</Label>
+              <div className="flex gap-2">
+                <Input
+                  id="reveal-bibliography"
+                  value={bibliography}
+                  onChange={(e) => setBibliography(e.target.value)}
+                  placeholder="/path/to/citations.bib"
+                  className="flex-1"
+                />
+                <Button variant="outline" size="sm" onClick={() => handleBrowseFile(setBibliography)}>
+                  Browse
+                </Button>
+              </div>
+            </div>
+
+            <div>
+              <Label htmlFor="reveal-csl">CSL Style</Label>
+              <div className="flex gap-2">
+                <Input
+                  id="reveal-csl"
+                  value={csl}
+                  onChange={(e) => setCsl(e.target.value)}
+                  placeholder="/path/to/style.csl"
+                  className="flex-1"
+                />
+                <Button variant="outline" size="sm" onClick={() => handleBrowseFile(setCsl)}>
+                  Browse
+                </Button>
+              </div>
+            </div>
+          </div>
+
+          {error && (
+            <div
+              role="alert"
+              className="rounded border border-destructive/40 bg-destructive/5 p-2 text-xs text-destructive"
+            >
+              {error}
+            </div>
+          )}
+        </div>
+
+        <ExportDialogFooter
+          onCancel={closeModal}
+          onSubmit={handleSubmit}
+          submitting={submitting}
+          submitLabel="Export"
+        />
+      </DialogContent>
+    </Dialog>
+  );
+}

src/renderer/components/modals/ModalLayer.tsx

@@ -8,6 +8,7 @@ import { ExportBatchDialog } from './ExportBatchDialog';
 import { ExportDocxDialog } from './ExportDocxDialog';
 import { ExportHtmlDialog } from './ExportHtmlDialog';
 import { ExportPdfDialog } from './ExportPdfDialog';
+import { ExportRevealjsDialog } from './ExportRevealjsDialog';
 import { FindInFilesDialog } from './FindInFilesDialog';
 import { HeaderFooterDialog } from './HeaderFooterDialog';
 import { SettingsSheet } from './SettingsSheet';
@@ -29,6 +30,8 @@ export function ModalLayer() {
       return <ExportDocxDialog sourcePath={modal.props.sourcePath} />;
     case 'export-html':
       return <ExportHtmlDialog sourcePath={modal.props.sourcePath} />;
+    case 'export-revealjs':
+      return <ExportRevealjsDialog sourcePath={modal.props.sourcePath} />;
     case 'export-batch':
       return <ExportBatchDialog sourcePaths={modal.props.sourcePaths} />;
     case 'settings':

src/renderer/components/modals/PdfEditorDialog.tsx

@@ -1,4 +1,12 @@
-import { useState, useEffect, useCallback } from 'react';
+import { useState, useEffect, useCallback, useRef } from 'react';
+import * as pdfjsLib from 'pdfjs-dist';
+
+// Set up the worker for pdfjs-dist
+pdfjsLib.GlobalWorkerOptions.workerSrc = new URL(
+  'pdfjs-dist/build/pdf.worker.mjs',
+  import.meta.url
+).toString();
+
 import {
   Dialog,
   DialogContent,
@@ -38,6 +46,129 @@ import {
   X,
 } from 'lucide-react';
 
+interface PdfPageState {
+  originalPageNum: number;
+  rotation: number;
+  isDeleted: boolean;
+}
+
+function PdfPageThumbnail({
+  pdfDoc,
+  pageState,
+  onRotate,
+  onDelete,
+  onMoveUp,
+  onMoveDown,
+  isFirst,
+  isLast,
+}: {
+  pdfDoc: any;
+  pageState: PdfPageState;
+  onRotate: () => void;
+  onDelete: () => void;
+  onMoveUp: () => void;
+  onMoveDown: () => void;
+  isFirst: boolean;
+  isLast: boolean;
+}) {
+  const canvasRef = useRef<HTMLCanvasElement>(null);
+  const [loading, setLoading] = useState(false);
+
+  useEffect(() => {
+    let active = true;
+    const renderPage = async () => {
+      if (!canvasRef.current || !pdfDoc) return;
+      setLoading(true);
+      try {
+        const page = await pdfDoc.getPage(pageState.originalPageNum);
+        if (!active) return;
+        const viewport = page.getViewport({ scale: 0.25 });
+        const canvas = canvasRef.current;
+        const context = canvas.getContext('2d');
+        if (!context) return;
+        canvas.height = viewport.height;
+        canvas.width = viewport.width;
+
+        await page.render({
+          canvasContext: context,
+          viewport: viewport,
+        }).promise;
+      } catch (err) {
+        console.error('Error rendering thumbnail:', err);
+      } finally {
+        if (active) setLoading(false);
+      }
+    };
+
+    renderPage();
+    return () => {
+      active = false;
+    };
+  }, [pdfDoc, pageState.originalPageNum]);
+
+  return (
+    <div
+      className={`relative flex flex-col items-center p-2 border rounded bg-card text-card-foreground ${
+        pageState.isDeleted ? 'opacity-40' : ''
+      }`}
+    >
+      <div className="relative border bg-white flex items-center justify-center overflow-hidden w-24 h-32">
+        {loading && <Loader2 className="absolute animate-spin size-4 text-primary" />}
+        <canvas
+          ref={canvasRef}
+          style={{ transform: `rotate(${pageState.rotation}deg)` }}
+          className="max-w-full max-h-full transition-transform duration-200"
+        />
+      </div>
+      <div className="text-[10px] mt-1 font-semibold text-foreground">Page {pageState.originalPageNum}</div>
+      <div className="flex gap-1 mt-1.5">
+        <Button
+          variant="outline"
+          size="icon"
+          className="size-6"
+          onClick={onRotate}
+          title="Rotate 90°"
+          type="button"
+        >
+          <RotateCw className="size-3" />
+        </Button>
+        <Button
+          variant="outline"
+          size="icon"
+          className={`size-6 ${pageState.isDeleted ? 'bg-destructive/10 text-destructive border-destructive/30' : ''}`}
+          onClick={onDelete}
+          title={pageState.isDeleted ? 'Restore' : 'Delete'}
+          type="button"
+        >
+          <Trash2 className="size-3" />
+        </Button>
+        <Button
+          variant="outline"
+          size="icon"
+          className="size-6"
+          onClick={onMoveUp}
+          disabled={isFirst}
+          title="Move Up"
+          type="button"
+        >
+          <ArrowUpDown className="size-3 rotate-90" />
+        </Button>
+        <Button
+          variant="outline"
+          size="icon"
+          className="size-6"
+          onClick={onMoveDown}
+          disabled={isLast}
+          title="Move Down"
+          type="button"
+        >
+          <ArrowUpDown className="size-3 -rotate-90" />
+        </Button>
+      </div>
+    </div>
+  );
+}
+
 type Operation =
   | 'merge'
   | 'split'
@@ -225,6 +356,76 @@ export function PdfEditorDialog({ onClose, initialFilePath }: Props) {
   const [permissionsPassword, setPermissionsPassword] = useState('');
   const [permissions, setPermissions] = useState<Record<string, boolean>>({});
 
+  const [pdfDoc, setPdfDoc] = useState<any>(null);
+  const [pdfPages, setPdfPages] = useState<PdfPageState[]>([]);
+  const [pdfLoading, setPdfLoading] = useState(false);
+
+  useEffect(() => {
+    let active = true;
+    if (!inputPath || !['rotate', 'delete', 'reorder'].includes(activeTab)) {
+      setPdfDoc(null);
+      setPdfPages([]);
+      return;
+    }
+
+    const loadPdf = async () => {
+      setPdfLoading(true);
+      setPdfDoc(null);
+      setPdfPages([]);
+      try {
+        const readBufferFn = window.electronAPI?.file?.readBuffer;
+        if (!readBufferFn) {
+          console.warn('readBuffer function is not available on window.electronAPI.file');
+          return;
+        }
+        const res = await readBufferFn(inputPath);
+        if (!active) return;
+        if (res && res.ok && res.data) {
+          const doc = await pdfjsLib.getDocument({ data: res.data }).promise;
+          if (!active) return;
+          setPdfDoc(doc);
+          const count = doc.numPages;
+          const initialPages = Array.from({ length: count }, (_, i) => ({
+            originalPageNum: i + 1,
+            rotation: 0,
+            isDeleted: false,
+          }));
+          setPdfPages(initialPages);
+        }
+      } catch (err) {
+        console.error('Error loading PDF in sidebar:', err);
+      } finally {
+        if (active) setPdfLoading(false);
+      }
+    };
+
+    loadPdf();
+    return () => {
+      active = false;
+    };
+  }, [inputPath, activeTab]);
+
+  useEffect(() => {
+    if (pdfPages.length === 0) return;
+    if (activeTab === 'rotate') {
+      const rotated = pdfPages.filter((p) => p.rotation > 0);
+      const pagesStr = rotated.map((p) => p.originalPageNum).join(',');
+      setPages(pagesStr);
+      if (rotated.length > 0) {
+        setRotateAngle(String(rotated[rotated.length - 1].rotation % 360));
+      }
+    } else if (activeTab === 'delete') {
+      const deletedStr = pdfPages
+        .filter((p) => p.isDeleted)
+        .map((p) => p.originalPageNum)
+        .join(',');
+      setPages(deletedStr);
+    } else if (activeTab === 'reorder') {
+      const orderStr = pdfPages.map((p) => p.originalPageNum).join(',');
+      setNewOrder(orderStr);
+    }
+  }, [pdfPages, activeTab]);
+
   useEffect(() => {
     if (initialFilePath) setInputPath(initialFilePath);
   }, [initialFilePath]);
@@ -470,7 +671,11 @@ export function PdfEditorDialog({ onClose, initialFilePath }: Props) {
 
   return (
     <Dialog open onOpenChange={(o) => !o && onClose()}>
-      <DialogContent className="flex max-h-[85vh] max-w-2xl flex-col">
+      <DialogContent className={`flex max-h-[85vh] flex-col transition-all duration-300 ${
+        ['rotate', 'delete', 'reorder'].includes(activeTab) && (pdfPages.length > 0 || pdfLoading)
+          ? 'max-w-5xl w-[90vw]'
+          : 'max-w-2xl'
+      }`}>
         <DialogHeader>
           <DialogTitle>PDF Editor</DialogTitle>
           <DialogDescription>Manipulate and transform PDF files</DialogDescription>
@@ -482,6 +687,7 @@ export function PdfEditorDialog({ onClose, initialFilePath }: Props) {
             setActiveTab(v as Operation);
             setError(null);
           }}
+          className="flex flex-col flex-1 min-h-0 overflow-hidden"
         >
           <TabsList className="flex-wrap">
             {OPERATIONS.map((op) => (
@@ -492,7 +698,8 @@ export function PdfEditorDialog({ onClose, initialFilePath }: Props) {
             ))}
           </TabsList>
 
-          <div className="flex-1 overflow-y-auto">
+          <div className="flex flex-1 gap-6 overflow-hidden min-h-0 mt-3">
+            <div className="flex-1 overflow-y-auto pr-1">
             <TabsContent value="merge" className="space-y-3 pt-3">
               <div className="space-y-1.5">
                 <Label>PDF files</Label>
@@ -963,6 +1170,64 @@ export function PdfEditorDialog({ onClose, initialFilePath }: Props) {
               {renderError()}
             </TabsContent>
           </div>
+
+          {['rotate', 'delete', 'reorder'].includes(activeTab) && (pdfPages.length > 0 || pdfLoading) && (
+            <div className="w-80 border-l pl-4 flex flex-col min-h-0">
+              <h3 className="font-semibold text-sm mb-2 text-foreground">Page Thumbnails</h3>
+              {pdfLoading ? (
+                <div className="flex flex-1 items-center justify-center">
+                  <Loader2 className="size-6 animate-spin text-primary" />
+                </div>
+              ) : (
+                <div className="flex-1 overflow-y-auto grid grid-cols-2 gap-2 pr-1 content-start">
+                  {pdfPages.map((pageState, index) => (
+                    <PdfPageThumbnail
+                      key={`${pageState.originalPageNum}-${index}`}
+                      pdfDoc={pdfDoc}
+                      pageState={pageState}
+                      isFirst={index === 0}
+                      isLast={index === pdfPages.length - 1}
+                      onRotate={() => {
+                        setPdfPages((prev) =>
+                          prev.map((p, idx) =>
+                            idx === index ? { ...p, rotation: (p.rotation + 90) % 360 } : p
+                          )
+                        );
+                      }}
+                      onDelete={() => {
+                        setPdfPages((prev) =>
+                          prev.map((p, idx) =>
+                            idx === index ? { ...p, isDeleted: !p.isDeleted } : p
+                          )
+                        );
+                      }}
+                      onMoveUp={() => {
+                        if (index === 0) return;
+                        setPdfPages((prev) => {
+                          const next = [...prev];
+                          const temp = next[index];
+                          next[index] = next[index - 1];
+                          next[index - 1] = temp;
+                          return next;
+                        });
+                      }}
+                      onMoveDown={() => {
+                        if (index === pdfPages.length - 1) return;
+                        setPdfPages((prev) => {
+                          const next = [...prev];
+                          const temp = next[index];
+                          next[index] = next[index + 1];
+                          next[index + 1] = temp;
+                          return next;
+                        });
+                      }}
+                    />
+                  ))}
+                </div>
+              )}
+            </div>
+          )}
+        </div>
       </Tabs>
 
         {renderProgress()}

src/renderer/components/preview/MarkdownRenderer.tsx

@@ -32,7 +32,7 @@ export function MarkdownRenderer({ source }: Props) {
   }, [source]);
 
   return (
-    <div className="prose prose-neutral dark:prose-invert max-w-none p-6" ref={containerRef}>
+    <div className="prose prose-neutral dark:prose-invert max-w-none p-6 preview-content" ref={containerRef}>
       <div dangerouslySetInnerHTML={{ __html: html }} />
       {mermaidCodes.map((code, i) => (
         <div key={i} className="my-4">

src/renderer/lib/commands/register-menu-commands.ts

@@ -68,6 +68,23 @@ export function registerMenuCommands(): void {
       if (!activeTabId) return;
       useAppStore.getState().openModal('export-html', { sourcePath: activeTabId });
     },
+    'file.showExportDialog': (format?: string) => {
+      const activeTabId = useFileStore.getState().activeTabId;
+      if (!activeTabId) return;
+      if (format === 'pdf') {
+        useAppStore.getState().openModal('export-pdf', { sourcePath: activeTabId });
+      } else if (format === 'docx') {
+        useAppStore.getState().openModal('export-docx', { sourcePath: activeTabId });
+      } else if (format === 'html') {
+        useAppStore.getState().openModal('export-html', { sourcePath: activeTabId });
+      } else if (format === 'revealjs') {
+        useAppStore.getState().openModal('export-revealjs' as any, { sourcePath: activeTabId } as any);
+      } else if (format === 'word') {
+        useAppStore.getState().openModal('export-word', { sourcePath: activeTabId });
+      } else if (format) {
+        window.electronAPI?.export?.withOptions?.(format, {});
+      }
+    },
     'file.exportBatch': () => {
       const paths = useFileStore.getState().openTabs.map((t) => t.path);
       if (paths.length === 0) return;
@@ -423,4 +440,5 @@ export function useBridgeNativeMenu(): void {
   useMenuAction('show-batch-converter', 'batch.showConverter', (type) => type as string);
   useMenuAction('show-document-compare', 'tools.documentCompare');
   useMenuAction('open-header-footer-dialog', 'settings.headerFooter');
+  useMenuAction('show-export-dialog', 'file.showExportDialog', (format) => format as string);
 }

src/renderer/lib/ipc.ts

@@ -94,7 +94,11 @@ export const ipc = {
     writeBuffer: (args: {
       path: string;
       buffer: Uint8Array;
-    }): Promise<IpcResult<void | ChannelMissing>> => safeCall('file', 'list', args.path),
+    }): Promise<IpcResult<void | ChannelMissing>> => safeCall('file', 'writeBuffer', args.path, args.buffer),
+    readBuffer: (
+      path: string
+    ): Promise<IpcResult<{ ok: boolean; data: Uint8Array } | ChannelMissing>> =>
+      safeCall('file', 'readBuffer', path),
     gitStage: (args: {
       rootPath: string;
       files: string[];

src/renderer/stores/app-store.ts

@@ -23,6 +23,7 @@ export type ModalState =
   | { kind: 'export-docx'; props: { sourcePath: string } }
   | { kind: 'export-html'; props: { sourcePath: string } }
   | { kind: 'export-batch'; props: { sourcePaths: string[] } }
+  | { kind: 'export-revealjs'; props: { sourcePath: string } }
   | { kind: 'settings' }
   | { kind: 'about' }
   | { kind: 'welcome' }

src/renderer/stores/preview-store.ts

@@ -3,8 +3,11 @@ import { create } from 'zustand';
 interface PreviewState {
   source: string;
   scrollRatio: number;
+  largeFileMode: boolean;
   setSource: (s: string) => void;
   setScrollRatio: (r: number) => void;
+  setLargeFileMode: (v: boolean) => void;
+  forceRender: (s: string) => void;
 }
 
 const DEBOUNCE_MS = 300;
@@ -14,7 +17,12 @@ let pending: string = '';
 export const usePreviewStore = create<PreviewState>((set) => ({
   source: '',
   scrollRatio: 0,
+  largeFileMode: false,
   setSource: (s) => {
+    // If in large file mode, do not auto-update preview source on user typing
+    if (usePreviewStore.getState().largeFileMode) {
+      return;
+    }
     pending = s;
     if (timer) clearTimeout(timer);
     timer = setTimeout(() => {
@@ -22,4 +30,9 @@ export const usePreviewStore = create<PreviewState>((set) => ({
     }, DEBOUNCE_MS);
   },
   setScrollRatio: (r) => set({ scrollRatio: r }),
+  setLargeFileMode: (v) => set({ largeFileMode: v }),
+  forceRender: (s) => {
+    if (timer) clearTimeout(timer);
+    set({ source: s });
+  },
 }));

src/renderer/test/setup.ts

@@ -1,5 +1,7 @@
 import '@testing-library/jest-dom/vitest';
 
+import { vi } from 'vitest';
+
 // Mock window.electronAPI for tests
 declare global {
   interface Window {
@@ -8,10 +10,85 @@ declare global {
 }
 
 if (typeof window !== 'undefined') {
-  window.electronAPI = window.electronAPI || {};
-  if (!window.electronAPI.invoke) {
-    window.electronAPI.invoke = async () => null;
-  }
+  window.electronAPI = {
+    send: vi.fn(),
+    on: vi.fn(() => vi.fn()),
+    once: vi.fn(),
+    invoke: vi.fn(() => Promise.resolve(null)),
+    removeAllListeners: vi.fn(),
+    getAppVersion: vi.fn(() => Promise.resolve('5.0.1')),
+    file: {
+      save: vi.fn(),
+      saveCurrent: vi.fn(),
+      setCurrent: vi.fn(),
+      saveRecent: vi.fn(),
+      clearRecent: vi.fn(),
+      rendererReady: vi.fn(),
+      read: vi.fn(() => Promise.resolve('')),
+      write: vi.fn(() => Promise.resolve()),
+      delete: vi.fn(() => Promise.resolve()),
+      ensureDir: vi.fn(() => Promise.resolve()),
+      exists: vi.fn(() => Promise.resolve(false)),
+      isDirectory: vi.fn(() => Promise.resolve(false)),
+      copy: vi.fn(() => Promise.resolve()),
+      move: vi.fn(() => Promise.resolve()),
+      list: vi.fn(() => Promise.resolve({ ok: true, data: [] })),
+      pickFolder: vi.fn(() => Promise.resolve({ ok: true, data: null })),
+      pickFile: vi.fn(() => Promise.resolve({ ok: true, data: null })),
+    },
+    theme: {
+      get: vi.fn(),
+    },
+    print: {
+      doPrint: vi.fn(),
+      show: vi.fn(),
+    },
+    export: {
+      withOptions: vi.fn(),
+      spreadsheet: vi.fn(),
+    },
+    batch: {
+      convert: vi.fn(),
+      selectFolder: vi.fn(),
+    },
+    converter: {
+      convert: vi.fn(),
+      convertBatch: vi.fn(),
+    },
+    headerFooter: {
+      getSettings: vi.fn(),
+      saveSettings: vi.fn(),
+      browseLogo: vi.fn(),
+      saveLogo: vi.fn(),
+      clearLogo: vi.fn(),
+    },
+    page: {
+      getSettings: vi.fn(),
+      updateSettings: vi.fn(),
+      setCustomStartPage: vi.fn(),
+    },
+    pdf: {
+      processOperation: vi.fn(),
+      getPageCount: vi.fn(),
+      selectFolder: vi.fn(),
+    },
+    git: {
+      status: vi.fn(() => Promise.resolve([])),
+      stage: vi.fn(),
+      commit: vi.fn(),
+    },
+    updater: {
+      check: vi.fn(),
+      install: vi.fn(),
+      getState: vi.fn(),
+      onStatus: vi.fn(() => vi.fn()),
+    },
+    crash: {
+      read: vi.fn(),
+      openDir: vi.fn(),
+      delete: vi.fn(),
+    },
+  };
 }
 
 // Mock matchMedia for next-themes (jsdom doesn't have it)
@@ -58,3 +135,12 @@ if (typeof window !== 'undefined' && !Element.prototype.hasPointerCapture) {
 if (typeof window !== 'undefined' && !Element.prototype.scrollIntoView) {
   Element.prototype.scrollIntoView = function () {};
 }
+
+// Polyfill DOMMatrix for pdfjs-dist (jsdom doesn't implement it)
+if (typeof window !== 'undefined' && !(window as any).DOMMatrix) {
+  class DOMMatrix {
+    a = 1; b = 0; c = 0; d = 1; e = 0; f = 0;
+  }
+  (window as any).DOMMatrix = DOMMatrix;
+  (global as any).DOMMatrix = DOMMatrix;
+}

tests/component/modals/AboutDialog.test.tsx

@@ -7,10 +7,8 @@ import { useAppStore } from '@/stores/app-store';
 describe('AboutDialog', () => {
   beforeEach(() => {
     window.electronAPI = {
-      app: {
-        getVersion: vi.fn().mockResolvedValue('5.0.0'),
-        openExternal: vi.fn().mockResolvedValue({ ok: true }),
-      },
+      getAppVersion: vi.fn().mockResolvedValue('5.0.0'),
+      send: vi.fn().mockResolvedValue({ ok: true }),
     } as any;
     // Reset store to about modal so dialog renders
     useAppStore.setState({ modal: { kind: 'about' } } as any);

tests/component/modals/ExportBatchDialog.test.tsx

@@ -7,12 +7,12 @@ describe('ExportBatchDialog', () => {
   beforeEach(() => {
     localStorage.clear();
     window.electronAPI = {
-      export: {
-        batch: vi.fn().mockResolvedValue({
-          ok: true,
-          data: { total: 2, succeeded: 2, failed: 0, results: [] },
+      invoke: vi.fn().mockResolvedValue({
+        total: 2,
+        succeeded: 2,
+        failed: 0,
+        results: [],
       }),
-      },
     } as any;
   });
 
@@ -27,11 +27,12 @@ describe('ExportBatchDialog', () => {
     await userEvent.click(screen.getByRole('combobox', { name: /format/i }));
     await userEvent.click(screen.getByRole('option', { name: /^pdf$/i }));
     await userEvent.click(screen.getByRole('button', { name: /^export$/i }));
-    const call = (window.electronAPI.export.batch as any).mock.calls[0];
-    expect(call[0]).toEqual([
+    const call = (window.electronAPI.invoke as any).mock.calls[0];
+    expect(call[0]).toBe('batch-convert');
+    expect(call[1].items).toEqual([
       { inputPath: '/a.md', outputPath: expect.any(String) },
       { inputPath: '/b.md', outputPath: expect.any(String) },
     ]);
-    expect(call[1].format).toBe('pdf');
+    expect(call[1].options.format).toBe('pdf');
   });
 });

tests/component/modals/HeaderFooterDialog.test.tsx

@@ -18,28 +18,45 @@ const defaultSettings = {
   logoPath: null,
 };
 
-const mockGetSettings = vi.fn().mockResolvedValue(defaultSettings);
-const mockSaveSettings = vi.fn().mockResolvedValue(undefined);
-const mockBrowseLogo = vi.fn().mockResolvedValue('/path/to/logo.png');
+let registeredCallback: ((data: any) => void) | null = null;
+const mockSend = vi.fn((channel, ...args) => {
+  if (channel === 'get-header-footer-settings') {
+    setTimeout(() => {
+      if (registeredCallback) registeredCallback(defaultSettings);
+    }, 0);
+  }
+});
+
+const mockOn = vi.fn((channel, cb) => {
+  if (channel === 'header-footer-settings-data') {
+    registeredCallback = cb as any;
+    // Trigger immediately with default settings to satisfy initial mount loading
+    setTimeout(() => {
+      cb(defaultSettings);
+    }, 0);
+  }
+  return vi.fn(); // cleanup/unsubscribe fn
+});
 
 beforeEach(() => {
   localStorage.clear();
   vi.clearAllMocks();
+  registeredCallback = null;
   useSettingsStore.setState(useSettingsStore.getInitialState());
   useAppStore.setState({ modal: { kind: null } } as any);
   (window.electronAPI as any) = {
-    headerFooter: {
-      getSettings: mockGetSettings,
-      saveSettings: mockSaveSettings,
-      browseLogo: mockBrowseLogo,
-    },
+    send: mockSend,
+    on: mockOn,
+    once: vi.fn(),
+    invoke: vi.fn(() => Promise.resolve(null)),
+    removeAllListeners: vi.fn(),
   };
 });
 
 describe('HeaderFooterDialog', () => {
   it('loads settings from electronAPI on mount', async () => {
     render(<HeaderFooterDialog />);
-    await waitFor(() => expect(mockGetSettings).toHaveBeenCalled());
+    await waitFor(() => expect(mockSend).toHaveBeenCalledWith('get-header-footer-settings'));
     expect(screen.getByText(/header & footer/i)).toBeInTheDocument();
   });
 
@@ -61,7 +78,7 @@ describe('HeaderFooterDialog', () => {
     render(<HeaderFooterDialog />);
     await waitFor(() => expect(screen.getByText(/header & footer/i)).toBeInTheDocument());
     await userEvent.click(screen.getByRole('button', { name: /^save$/i }));
-    await waitFor(() => expect(mockSaveSettings).toHaveBeenCalled());
+    await waitFor(() => expect(mockSend).toHaveBeenCalledWith('save-header-footer-settings', expect.any(Object)));
   });
 
   it('closes modal on Cancel', async () => {
@@ -72,7 +89,16 @@ describe('HeaderFooterDialog', () => {
   });
 
   it('inserts dynamic field token into header input', async () => {
-    mockGetSettings.mockResolvedValue({ ...defaultSettings, headerEnabled: true });
+    // Override registered callback to return enabled header
+    mockOn.mockImplementationOnce((channel, cb) => {
+      if (channel === 'header-footer-settings-data') {
+        setTimeout(() => {
+          cb({ ...defaultSettings, headerEnabled: true });
+        }, 0);
+      }
+      return vi.fn();
+    });
+
     render(<HeaderFooterDialog />);
     await waitFor(() => expect(screen.getByText(/header & footer/i)).toBeInTheDocument());
     const tokenButton = screen.getAllByTitle('Page')[0];

tests/component/modals/PdfEditorDialog.test.tsx

@@ -7,6 +7,28 @@ const mockProcessOperation = vi.fn().mockResolvedValue(undefined);
 const mockPickFile = vi.fn();
 const mockPickFolder = vi.fn();
 const mockShowSaveDialog = vi.fn();
+const mockReadBuffer = vi.fn();
+
+// Mock pdfjs-dist to avoid rendering/worker issues in node test environment
+vi.mock('pdfjs-dist', () => {
+  const mockRenderPromise = Promise.resolve();
+  const mockPage = {
+    getViewport: vi.fn().mockReturnValue({ width: 100, height: 150 }),
+    render: vi.fn().mockReturnValue({ promise: mockRenderPromise }),
+  };
+  const mockDoc = {
+    numPages: 3,
+    getPage: vi.fn().mockResolvedValue(mockPage),
+  };
+  return {
+    GlobalWorkerOptions: {
+      workerSrc: '',
+    },
+    getDocument: vi.fn().mockReturnValue({
+      promise: Promise.resolve(mockDoc),
+    }),
+  };
+});
 
 beforeEach(() => {
   localStorage.clear();
@@ -14,10 +36,12 @@ beforeEach(() => {
   mockPickFile.mockResolvedValue({ ok: true, data: null });
   mockPickFolder.mockResolvedValue({ ok: true, data: null });
   mockShowSaveDialog.mockResolvedValue({ ok: true, data: null });
+  mockReadBuffer.mockResolvedValue({ ok: true, data: new Uint8Array([1, 2, 3]) });
   window.electronAPI = {
     file: {
       pickFile: mockPickFile,
       pickFolder: mockPickFolder,
+      readBuffer: mockReadBuffer,
     },
     app: {
       showSaveDialog: mockShowSaveDialog,
@@ -294,4 +318,69 @@ describe('PdfEditorDialog', () => {
     await userEvent.click(screen.getByText('Compress'));
     expect(screen.queryByText(/add at least 2 pdf files/i)).not.toBeInTheDocument();
   });
+
+  it('renders interactive page thumbnails in rotate tab', async () => {
+    render(<PdfEditorDialog onClose={() => {}} initialFilePath="/test.pdf" />);
+
+    // Switch to Rotate tab
+    await userEvent.click(screen.getByText('Rotate'));
+
+    // Wait for the thumbnails to load and render
+    await waitFor(() => {
+      expect(screen.getByText('Page 1')).toBeInTheDocument();
+      expect(screen.getByText('Page 2')).toBeInTheDocument();
+      expect(screen.getByText('Page 3')).toBeInTheDocument();
+    });
+
+    // Check Rotate button on page 1 thumbnail
+    const rotateBtns = screen.getAllByTitle('Rotate 90°');
+    expect(rotateBtns).toHaveLength(3);
+
+    // Click rotate on page 1
+    await userEvent.click(rotateBtns[0]);
+
+    // Check if the form's "Pages" input is updated to "1"
+    const pagesInput = screen.getByPlaceholderText('All pages') as HTMLInputElement;
+    expect(pagesInput.value).toBe('1');
+  });
+
+  it('toggles page deletion status in delete tab', async () => {
+    render(<PdfEditorDialog onClose={() => {}} initialFilePath="/test.pdf" />);
+
+    // Switch to Delete tab
+    await userEvent.click(screen.getByText('Delete'));
+
+    // Wait for the thumbnails
+    await waitFor(() => {
+      expect(screen.getByText('Page 1')).toBeInTheDocument();
+    });
+
+    // Click Delete button on page 1
+    const deleteBtns = screen.getAllByTitle('Delete');
+    await userEvent.click(deleteBtns[0]);
+
+    // Check if the pages to delete input is updated to "1"
+    const pagesInput = screen.getByPlaceholderText('1,3,5-8') as HTMLInputElement;
+    expect(pagesInput.value).toBe('1');
+  });
+
+  it('reorders pages in reorder tab', async () => {
+    render(<PdfEditorDialog onClose={() => {}} initialFilePath="/test.pdf" />);
+
+    // Switch to Reorder tab
+    await userEvent.click(screen.getByText('Reorder'));
+
+    // Wait for the thumbnails
+    await waitFor(() => {
+      expect(screen.getByText('Page 1')).toBeInTheDocument();
+    });
+
+    // Move Page 1 Down
+    const moveDownBtns = screen.getAllByTitle('Move Down');
+    await userEvent.click(moveDownBtns[0]);
+
+    // Check if the new order input is updated
+    const newOrderInput = screen.getByPlaceholderText('3,1,2,5,4') as HTMLTextAreaElement;
+    expect(newOrderInput.value).toBe('2,1,3');
+  });
 });

tests/component/sidebar/GitStatusPanel.test.tsx

@@ -3,38 +3,20 @@ import { render, screen } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
 import { GitStatusPanel } from '@/components/sidebar/GitStatusPanel';
 import { useFileStore } from '@/stores/file-store';
-
-vi.mock('@/lib/ipc', () => ({
-  ipc: {
-    file: {
-      gitStatus: vi.fn(),
-    },
-  },
-}));
-
-vi.mock('@/lib/toast', () => ({
-  toast: {
-    success: vi.fn(),
-    error: vi.fn(),
-    info: vi.fn(),
-    warning: vi.fn(),
-    promise: vi.fn(),
-    dismiss: vi.fn(),
-  },
-}));
-
 import { ipc } from '@/lib/ipc';
 
 const mockGitStage = vi.fn();
 const mockGitCommit = vi.fn();
 
-Object.defineProperty(window, 'electronAPI', {
-  value: {
-    gitStage: mockGitStage,
-    gitCommit: mockGitCommit,
+vi.mock('@/lib/ipc', () => ({
+  ipc: {
+    file: {
+      gitStatus: vi.fn(),
+      gitStage: (args: any) => mockGitStage(args),
+      gitCommit: (args: any) => mockGitCommit(args),
     },
-  writable: true,
-});
+  },
+}));
 
 describe('GitStatusPanel', () => {
   beforeEach(() => {
@@ -126,7 +108,7 @@ describe('GitStatusPanel', () => {
   });
 
   it('stages selected files', async () => {
-    mockGitStage.mockResolvedValueOnce(undefined);
+    mockGitStage.mockResolvedValueOnce({ ok: true });
     (ipc.file.gitStatus as any).mockResolvedValue({
       ok: true,
       data: [{ filePath: '/project/a.md', status: 'modified' }],
@@ -137,11 +119,11 @@ describe('GitStatusPanel', () => {
     await userEvent.click(checkbox);
     const stageBtn = screen.getByTestId('git-stage-selected');
     await userEvent.click(stageBtn);
-    expect(mockGitStage).toHaveBeenCalledWith(['/project/a.md']);
+    expect(mockGitStage).toHaveBeenCalledWith({ rootPath: '/project', files: ['/project/a.md'] });
   });
 
   it('commits with message', async () => {
-    mockGitCommit.mockResolvedValueOnce(undefined);
+    mockGitCommit.mockResolvedValueOnce({ ok: true });
     (ipc.file.gitStatus as any).mockResolvedValue({
       ok: true,
       data: [{ filePath: '/project/a.md', status: 'modified' }],
@@ -152,6 +134,6 @@ describe('GitStatusPanel', () => {
     await userEvent.type(input, 'fix typo');
     const commitBtn = screen.getByTestId('git-commit-button');
     await userEvent.click(commitBtn);
-    expect(mockGitCommit).toHaveBeenCalledWith('fix typo');
+    expect(mockGitCommit).toHaveBeenCalledWith({ rootPath: '/project', message: 'fix typo' });
   });
 });