refactor: migrate PDF export to desktop runtime abstraction

- Extract desktop-specific logic into src/services/desktop.ts
- Add runtime detection for Electron vs Tauri environments
- Simplify NoteEditor by delegating PDF export to desktop service
- Update printExport.ts to remove unused storage helpers
- Add Electron main process files in electron/ directory
- Update vite config and types for Electron integration
- Update .gitignore and package.json for Electron workflow

.gitignore

@@ -10,6 +10,7 @@ lerna-debug.log*
 node_modules
 dist
 dist-ssr
+release
 *.local
 
 # Editor directories and files

electron/main.cjs

@@ -0,0 +1,159 @@
+const fs = require('node:fs/promises');
+const path = require('node:path');
+const { app, BrowserWindow, dialog, ipcMain } = require('electron');
+
+const rendererUrl = process.env.ELECTRON_RENDERER_URL;
+const isDev = Boolean(rendererUrl);
+let mainWindow = null;
+
+const waitForPrintDocument = () => `
+  new Promise((resolve) => {
+    const pendingImages = Array.from(document.images).filter((image) => !image.complete);
+    const waitForImages = Promise.all(
+      pendingImages.map(
+        (image) =>
+          new Promise((done) => {
+            image.addEventListener('load', () => done(), { once: true });
+            image.addEventListener('error', () => done(), { once: true });
+          })
+      )
+    );
+    const waitForFonts = document.fonts ? document.fonts.ready.catch(() => undefined) : Promise.resolve();
+
+    Promise.all([waitForImages, waitForFonts]).then(() => {
+      requestAnimationFrame(() => requestAnimationFrame(() => resolve()));
+    });
+  });
+`;
+
+function createMainWindow() {
+  mainWindow = new BrowserWindow({
+    width: 1300,
+    height: 800,
+    minWidth: 800,
+    minHeight: 600,
+    show: false,
+    webPreferences: {
+      preload: path.join(__dirname, 'preload.cjs'),
+      contextIsolation: true,
+      nodeIntegration: false,
+      sandbox: false,
+    },
+  });
+
+  mainWindow.once('ready-to-show', () => {
+    mainWindow.show();
+  });
+
+  if (isDev) {
+    void mainWindow.loadURL(rendererUrl);
+    mainWindow.webContents.openDevTools({ mode: 'detach' });
+  } else {
+    void mainWindow.loadFile(path.join(__dirname, '..', 'dist', 'index.html'));
+  }
+}
+
+app.whenReady().then(() => {
+  createMainWindow();
+
+  app.on('activate', () => {
+    if (BrowserWindow.getAllWindows().length === 0) {
+      createMainWindow();
+    }
+  });
+});
+
+app.on('window-all-closed', () => {
+  if (process.platform !== 'darwin') {
+    app.quit();
+  }
+});
+
+ipcMain.handle('desktop:show-message', async (event, options) => {
+  const ownerWindow = BrowserWindow.fromWebContents(event.sender) ?? mainWindow;
+  const typeMap = {
+    info: 'info',
+    warning: 'warning',
+    error: 'error',
+  };
+
+  await dialog.showMessageBox(ownerWindow, {
+    type: typeMap[options.kind] || 'info',
+    title: options.title || app.name,
+    message: options.message,
+    buttons: ['OK'],
+    defaultId: 0,
+  });
+});
+
+ipcMain.handle('desktop:http-request', async (_event, payload) => {
+  const body =
+    payload.bodyBase64 != null
+      ? Buffer.from(payload.bodyBase64, 'base64')
+      : payload.bodyText;
+
+  const response = await fetch(payload.url, {
+    method: payload.method || 'GET',
+    headers: payload.headers,
+    body,
+  });
+
+  const buffer = Buffer.from(await response.arrayBuffer());
+
+  return {
+    ok: response.ok,
+    status: response.status,
+    statusText: response.statusText,
+    headers: Object.fromEntries(response.headers.entries()),
+    bodyBase64: buffer.toString('base64'),
+  };
+});
+
+ipcMain.handle('desktop:export-pdf', async (event, payload) => {
+  const ownerWindow = BrowserWindow.fromWebContents(event.sender) ?? mainWindow;
+  const saveResult = await dialog.showSaveDialog(ownerWindow, {
+    title: 'Export PDF',
+    defaultPath: payload.fileName,
+    filters: [{ name: 'PDF Document', extensions: ['pdf'] }],
+  });
+
+  if (saveResult.canceled || !saveResult.filePath) {
+    return { canceled: true };
+  }
+
+  const pdfWindow = new BrowserWindow({
+    width: 960,
+    height: 1100,
+    show: false,
+    parent: ownerWindow ?? undefined,
+    webPreferences: {
+      sandbox: false,
+      contextIsolation: true,
+      nodeIntegration: false,
+      spellcheck: false,
+    },
+  });
+
+  try {
+    await pdfWindow.loadURL(
+      `data:text/html;charset=utf-8,${encodeURIComponent(payload.documentHtml)}`
+    );
+    await pdfWindow.webContents.executeJavaScript(waitForPrintDocument(), true);
+
+    const pdfData = await pdfWindow.webContents.printToPDF({
+      printBackground: true,
+      preferCSSPageSize: true,
+    });
+
+    await fs.writeFile(saveResult.filePath, pdfData);
+
+    return {
+      canceled: false,
+      filePath: saveResult.filePath,
+    };
+  } finally {
+    if (!pdfWindow.isDestroyed()) {
+      pdfWindow.destroy();
+    }
+  }
+});

electron/preload.cjs

@@ -0,0 +1,8 @@
+const { contextBridge, ipcRenderer } = require('electron');
+
+contextBridge.exposeInMainWorld('electronDesktop', {
+  showMessage: (options) => ipcRenderer.invoke('desktop:show-message', options),
+  exportPdf: (payload) => ipcRenderer.invoke('desktop:export-pdf', payload),
+  httpRequest: (payload) => ipcRenderer.invoke('desktop:http-request', payload),
+  getRuntime: () => 'electron',
+});

index.html

@@ -4,6 +4,10 @@
     <meta charset="UTF-8" />
     <link rel="icon" type="image/svg+xml" href="/vite.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta
+      http-equiv="Content-Security-Policy"
+      content="default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: https: http:; font-src 'self' data:; connect-src 'self' https: http: ws: wss:; object-src 'none'; base-uri 'self'"
+    />
     <title>Nextcloud Notes</title>
     <!-- Local fonts for offline support -->
     <link rel="stylesheet" href="/fonts/fonts.css">

package.json

@@ -3,9 +3,14 @@
   "private": true,
   "version": "0.2.2",
   "type": "module",
+  "main": "electron/main.cjs",
   "scripts": {
     "dev": "vite",
+    "dev:renderer": "vite",
+    "dev:electron": "wait-on tcp:1420 && cross-env ELECTRON_RENDERER_URL=http://localhost:1420 electron .",
+    "dev:desktop": "concurrently -k \"npm:dev:renderer\" \"npm:dev:electron\"",
     "build": "tsc && vite build",
+    "desktop": "electron .",
     "preview": "vite preview",
     "tauri": "tauri"
   },
@@ -34,9 +39,13 @@
     "@types/turndown": "^5.0.6",
     "@vitejs/plugin-react": "^4.6.0",
     "autoprefixer": "^10.4.27",
+    "concurrently": "^9.2.1",
+    "cross-env": "^10.1.0",
+    "electron": "^37.3.1",
     "postcss": "^8.5.8",
     "tailwindcss": "^3.4.19",
     "typescript": "~5.8.3",
-    "vite": "^7.0.4"
+    "vite": "^7.0.4",
+    "wait-on": "^8.0.5"
   }
 }

src/App.tsx

@@ -1,4 +1,4 @@
-import { useState, useEffect } from 'react';
+import { lazy, Suspense, useEffect, useState } from 'react';
 import { LoginView } from './components/LoginView';
 import { NotesList } from './components/NotesList';
 import { NoteEditor } from './components/NoteEditor';
@@ -9,9 +9,13 @@ import { syncManager, SyncStatus } from './services/syncManager';
 import { localDB } from './db/localDB';
 import { useOnlineStatus } from './hooks/useOnlineStatus';
 import { categoryColorsSync } from './services/categoryColorsSync';
-import { PrintView } from './components/PrintView';
 import { PRINT_EXPORT_QUERY_PARAM } from './printExport';
 
+const LazyPrintView = lazy(async () => {
+  const module = await import('./components/PrintView');
+  return { default: module.PrintView };
+});
+
 function MainApp() {
   const [isLoggedIn, setIsLoggedIn] = useState(false);
   const [api, setApi] = useState<NextcloudAPI | null>(null);
@@ -397,7 +401,11 @@ function App() {
   const printJobId = params.get(PRINT_EXPORT_QUERY_PARAM);
 
   if (printJobId) {
-    return <PrintView jobId={printJobId} />;
+    return (
+      <Suspense fallback={<div className="min-h-screen bg-gray-100 px-8 py-12 text-gray-900">Preparing print view...</div>}>
+        <LazyPrintView jobId={printJobId} />
+      </Suspense>
+    );
   }
 
   return <MainApp />;

src/api/nextcloud.ts

@@ -1,5 +1,5 @@
-import { fetch as tauriFetch } from '@tauri-apps/plugin-http';
 import { Note, APIConfig } from '../types';
+import { runtimeFetch } from '../services/runtimeFetch';
 
 export class NextcloudAPI {
   private baseURL: string;
@@ -16,7 +16,7 @@ export class NextcloudAPI {
   }
 
   private async request<T>(path: string, options: RequestInit = {}): Promise<T> {
-    const response = await fetch(`${this.baseURL}${path}`, {
+    const response = await runtimeFetch(`${this.baseURL}${path}`, {
       ...options,
       headers: {
         'Content-Type': 'application/json',
@@ -124,7 +124,7 @@ export class NextcloudAPI {
     const url = `${this.serverURL}${webdavPath}`;
     console.log(`[Note ${_noteId}] Fetching attachment via WebDAV:`, url);
     
-    const response = await tauriFetch(url, {
+    const response = await runtimeFetch(url, {
       headers: {
         'Authorization': this.authHeader,
       },
@@ -174,7 +174,7 @@ export class NextcloudAPI {
     // First, try to create the attachments directory (MKCOL)
     // This may fail if it already exists, which is fine
     try {
-      await tauriFetch(`${this.serverURL}${webdavPath}/${attachmentDir}`, {
+      await runtimeFetch(`${this.serverURL}${webdavPath}/${attachmentDir}`, {
         method: 'MKCOL',
         headers: {
           'Authorization': this.authHeader,
@@ -188,7 +188,7 @@ export class NextcloudAPI {
     const arrayBuffer = await file.arrayBuffer();
     
     // Upload the file via PUT
-    const response = await tauriFetch(url, {
+    const response = await runtimeFetch(url, {
       method: 'PUT',
       headers: {
         'Authorization': this.authHeader,
@@ -210,7 +210,7 @@ export class NextcloudAPI {
     const url = `${this.serverURL}${webdavPath}`;
     
     try {
-      const response = await tauriFetch(url, {
+      const response = await runtimeFetch(url, {
         headers: {
           'Authorization': this.authHeader,
         },
@@ -238,7 +238,7 @@ export class NextcloudAPI {
     
     const content = JSON.stringify(colors, null, 2);
     
-    const response = await tauriFetch(url, {
+    const response = await runtimeFetch(url, {
       method: 'PUT',
       headers: {
         'Authorization': this.authHeader,
@@ -281,7 +281,7 @@ export class NextcloudAPI {
     const webdavPath = `/remote.php/dav/files/${this.username}/Notes`;
     const url = `${this.serverURL}${webdavPath}`;
     
-    const response = await tauriFetch(url, {
+    const response = await runtimeFetch(url, {
       method: 'PROPFIND',
       headers: {
         'Authorization': this.authHeader,
@@ -361,7 +361,7 @@ export class NextcloudAPI {
     const webdavPath = `/remote.php/dav/files/${this.username}/Notes${categoryPath}/${encodeURIComponent(filename)}`;
     const url = `${this.serverURL}${webdavPath}`;
     
-    const response = await tauriFetch(url, {
+    const response = await runtimeFetch(url, {
       headers: { 'Authorization': this.authHeader },
     });
     
@@ -383,7 +383,7 @@ export class NextcloudAPI {
     if (category) {
       try {
         const categoryUrl = `${this.serverURL}/remote.php/dav/files/${this.username}/Notes/${category}`;
-        await tauriFetch(categoryUrl, {
+        await runtimeFetch(categoryUrl, {
           method: 'MKCOL',
           headers: { 'Authorization': this.authHeader },
         });
@@ -394,7 +394,7 @@ export class NextcloudAPI {
     
     const noteContent = `${title}\n${content}`;
     
-    const response = await tauriFetch(url, {
+    const response = await runtimeFetch(url, {
       method: 'PUT',
       headers: {
         'Authorization': this.authHeader,
@@ -451,7 +451,7 @@ export class NextcloudAPI {
     
     const noteContent = this.formatNoteContent(note);
     
-    const response = await tauriFetch(url, {
+    const response = await runtimeFetch(url, {
       method: 'PUT',
       headers: {
         'Authorization': this.authHeader,
@@ -482,7 +482,7 @@ export class NextcloudAPI {
     const oldPath = `/remote.php/dav/files/${this.username}/Notes${categoryPath}/${encodeURIComponent(note.filename!)}`;
     const newPath = `/remote.php/dav/files/${this.username}/Notes${categoryPath}/${encodeURIComponent(newFilename)}`;
     
-    const response = await tauriFetch(`${this.serverURL}${oldPath}`, {
+    const response = await runtimeFetch(`${this.serverURL}${oldPath}`, {
       method: 'MOVE',
       headers: {
         'Authorization': this.authHeader,
@@ -509,7 +509,7 @@ export class NextcloudAPI {
     const newAttachmentPath = `/remote.php/dav/files/${this.username}/Notes${categoryPath}/${newAttachmentFolder}`;
     
     try {
-      await tauriFetch(`${this.serverURL}${oldAttachmentPath}`, {
+      await runtimeFetch(`${this.serverURL}${oldAttachmentPath}`, {
         method: 'MOVE',
         headers: {
           'Authorization': this.authHeader,
@@ -535,7 +535,7 @@ export class NextcloudAPI {
     const webdavPath = `/remote.php/dav/files/${this.username}/Notes${categoryPath}/${encodeURIComponent(note.filename!)}`;
     const url = `${this.serverURL}${webdavPath}`;
     
-    const response = await tauriFetch(url, {
+    const response = await runtimeFetch(url, {
       method: 'DELETE',
       headers: { 'Authorization': this.authHeader },
     });
@@ -560,7 +560,7 @@ export class NextcloudAPI {
         currentPath += (currentPath ? '/' : '') + part;
         try {
           const categoryUrl = `${this.serverURL}/remote.php/dav/files/${this.username}/Notes/${currentPath}`;
-          await tauriFetch(categoryUrl, {
+          await runtimeFetch(categoryUrl, {
             method: 'MKCOL',
             headers: { 'Authorization': this.authHeader },
           });
@@ -570,7 +570,7 @@ export class NextcloudAPI {
       }
     }
     
-    const response = await tauriFetch(`${this.serverURL}${oldPath}`, {
+    const response = await runtimeFetch(`${this.serverURL}${oldPath}`, {
       method: 'MOVE',
       headers: {
         'Authorization': this.authHeader,
@@ -597,7 +597,7 @@ export class NextcloudAPI {
     console.log(`  To: ${newAttachmentPath}`);
     
     try {
-      const attachmentResponse = await tauriFetch(`${this.serverURL}${oldAttachmentPath}`, {
+      const attachmentResponse = await runtimeFetch(`${this.serverURL}${oldAttachmentPath}`, {
         method: 'MOVE',
         headers: {
           'Authorization': this.authHeader,

src/components/NoteEditor.tsx

@@ -1,15 +1,17 @@
 import { useState, useEffect, useRef } from 'react';
 import { marked } from 'marked';
-import { message } from '@tauri-apps/plugin-dialog';
-import { emitTo, listen } from '@tauri-apps/api/event';
-import { WebviewWindow } from '@tauri-apps/api/webviewWindow';
 import { Note } from '../types';
 import { NextcloudAPI } from '../api/nextcloud';
 import { FloatingToolbar } from './FloatingToolbar';
 import { InsertToolbar } from './InsertToolbar';
+import {
+  exportPdfDocument,
+  getDesktopRuntime,
+  showDesktopMessage,
+} from '../services/desktop';
 import {
   getNoteTitleFromContent,
-  PRINT_EXPORT_QUERY_PARAM,
+  PrintExportPayload,
   sanitizeFileName,
 } from '../printExport';
 
@@ -51,6 +53,8 @@ export function NoteEditor({ note, onUpdateNote, onToggleFavorite, onUnsavedChan
   const previousNoteContentRef = useRef<string>('');
   const textareaRef = useRef<HTMLTextAreaElement>(null);
   const fileInputRef = useRef<HTMLInputElement>(null);
+  const desktopRuntime = getDesktopRuntime();
+  const exportActionLabel = desktopRuntime === 'electron' ? 'Export PDF' : 'Print Note';
 
   useEffect(() => {
     onUnsavedChanges?.(hasUnsavedChanges);
@@ -222,13 +226,6 @@ export function NoteEditor({ note, onUpdateNote, onToggleFavorite, onUnsavedChan
     if (!note) return;
 
     setIsExportingPDF(true);
-    const exportState: {
-      printWindow: WebviewWindow | null;
-      unlistenReady: (() => void) | null;
-    } = {
-      printWindow: null,
-      unlistenReady: null,
-    };
 
     try {
       let contentForPrint = localContent;
@@ -264,68 +261,22 @@ export function NoteEditor({ note, onUpdateNote, onToggleFavorite, onUnsavedChan
 
       const title = getNoteTitleFromContent(localContent);
       const fileName = `${sanitizeFileName(title)}.pdf`;
-      const jobId = `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
+      const noteHtml = marked.parse(contentForPrint || '', { async: false }) as string;
-      const windowLabel = `print-export-${jobId}`;
+      const payload: PrintExportPayload = {
-      const html = marked.parse(contentForPrint || '', { async: false }) as string;
+        fileName,
-      await new Promise<void>((resolve, reject) => {
+        title,
-        let settled = false;
+        html: noteHtml,
-        const timeoutId = window.setTimeout(() => {
+        previewFont,
-          if (settled) return;
+        previewFontSize,
-          settled = true;
+      };
-          exportState.unlistenReady?.();
-          reject(new Error('Print view initialization timed out.'));
-        }, 10000);
 
-        listen<{ jobId: string }>('print-export-ready', (event) => {
+      await exportPdfDocument({
-            if (settled || event.payload.jobId !== jobId) return;
+        ...payload,
-
-            settled = true;
-            window.clearTimeout(timeoutId);
-            exportState.unlistenReady?.();
-
-            void emitTo(windowLabel, 'print-export-payload', {
-              fileName,
-              title,
-              html,
-              previewFont,
-              previewFontSize,
-            })
-              .then(() => resolve())
-              .catch(reject);
-          })
-          .then((unlisten) => {
-            exportState.unlistenReady = unlisten;
-            exportState.printWindow = new WebviewWindow(windowLabel, {
-              url: `/?${PRINT_EXPORT_QUERY_PARAM}=${encodeURIComponent(jobId)}`,
-              title: 'Opening Print Dialog',
-              width: 960,
-              height: 1100,
-              center: true,
-              visible: true,
-              focus: true,
-              skipTaskbar: true,
-              resizable: false,
-              parent: 'main',
-            });
-
-            void exportState.printWindow.once('tauri://error', (event) => {
-              if (settled) return;
-              settled = true;
-              window.clearTimeout(timeoutId);
-              exportState.unlistenReady?.();
-              reject(new Error(String(event.payload ?? 'Failed to create print window.')));
-            });
-          })
-          .catch(reject);
       });
     } catch (error) {
       console.error('PDF export failed:', error);
-      const pendingPrintWindow = exportState.printWindow;
-      if (pendingPrintWindow) {
-        void pendingPrintWindow.close().catch(() => undefined);
-      }
       try {
-        await message('Failed to open the print-to-PDF view. Please try again.', {
+        await showDesktopMessage('Failed to export the PDF. Please try again.', {
           title: 'Export Failed',
           kind: 'error',
         });
@@ -333,10 +284,6 @@ export function NoteEditor({ note, onUpdateNote, onToggleFavorite, onUnsavedChan
         console.error('Could not show error dialog');
       }
     } finally {
-      const disposeReadyListener = exportState.unlistenReady;
-      if (disposeReadyListener) {
-        disposeReadyListener();
-      }
       setIsExportingPDF(false);
     }
   };
@@ -401,13 +348,13 @@ export function NoteEditor({ note, onUpdateNote, onToggleFavorite, onUnsavedChan
         setHasUnsavedChanges(true);
       }
       
-      await message(`Attachment uploaded successfully!`, {
+      await showDesktopMessage('Attachment uploaded successfully!', {
         title: 'Upload Complete',
         kind: 'info',
       });
     } catch (error) {
       console.error('Upload failed:', error);
-      await message(`Failed to upload attachment: ${error}`, {
+      await showDesktopMessage(`Failed to upload attachment: ${error}`, {
         title: 'Upload Failed',
         kind: 'error',
       });
@@ -719,13 +666,20 @@ export function NoteEditor({ note, onUpdateNote, onToggleFavorite, onUnsavedChan
                     ? 'text-blue-500 cursor-wait'
                     : 'text-gray-600 dark:text-gray-400 hover:bg-gray-100 dark:hover:bg-gray-700'
                 }`}
-                title={isExportingPDF ? "Opening print dialog..." : "Print Note"}
+                title={isExportingPDF ? `${exportActionLabel} in progress...` : exportActionLabel}
               >
                 {isExportingPDF ? (
                   <svg className="w-5 h-5 animate-spin" fill="none" viewBox="0 0 24 24">
                     <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4"></circle>
                     <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
                   </svg>
+                ) : desktopRuntime === 'electron' ? (
+                  <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 16V4" />
+                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8 12l4 4 4-4" />
+                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 20h14" />
+                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M7 20v-2a1 1 0 011-1h8a1 1 0 011 1v2" />
+                  </svg>
                 ) : (
                   <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                     <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 9V4a1 1 0 011-1h10a1 1 0 011 1v5" />

src/printExport.ts

@@ -7,10 +7,15 @@ export interface PrintExportPayload {
 }
 
 export const PRINT_EXPORT_QUERY_PARAM = 'printJob';
-const PRINT_EXPORT_STORAGE_PREFIX = 'print-export:';
 
-export const getPrintExportStorageKey = (jobId: string) =>
+const PRINT_DOCUMENT_CSP = [
-  `${PRINT_EXPORT_STORAGE_PREFIX}${jobId}`;
+  "default-src 'none'",
+  "style-src 'unsafe-inline'",
+  "img-src data: blob: https: http:",
+  "font-src data:",
+  "object-src 'none'",
+  "base-uri 'none'",
+].join('; ');
 
 export const getNoteTitleFromContent = (content: string) => {
   const firstLine = content
@@ -26,3 +31,225 @@ export const sanitizeFileName = (name: string) =>
     .replace(/[\\/:*?"<>|]/g, '-')
     .replace(/\s+/g, ' ')
     .trim() || 'note';
+
+const escapeHtml = (value: string) =>
+  value
+    .replace(/&/g, '&amp;')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+    .replace(/"/g, '&quot;')
+    .replace(/'/g, '&#39;');
+
+const escapeFontFamily = (value: string) =>
+  value.replace(/["\\]/g, '\\$&');
+
+export const buildPrintDocument = (payload: PrintExportPayload) => {
+  const fontFamily = `"${escapeFontFamily(payload.previewFont)}", Georgia, serif`;
+
+  return `<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta http-equiv="Content-Security-Policy" content="${PRINT_DOCUMENT_CSP}" />
+    <title>${escapeHtml(payload.fileName)}</title>
+    <style>
+      :root {
+        color-scheme: light;
+      }
+
+      * {
+        box-sizing: border-box;
+      }
+
+      html,
+      body {
+        margin: 0;
+        padding: 0;
+        background: #ffffff;
+        color: #0f172a;
+      }
+
+      body {
+        font-family: ${fontFamily};
+        font-size: ${payload.previewFontSize}px;
+        line-height: 1.7;
+        -webkit-print-color-adjust: exact;
+        print-color-adjust: exact;
+      }
+
+      @page {
+        size: A4;
+        margin: 18mm 16mm 18mm 16mm;
+      }
+
+      article {
+        color: #0f172a;
+      }
+
+      .print-note h1,
+      .print-note h2,
+      .print-note h3 {
+        color: #020617;
+        font-weight: 700;
+        page-break-after: avoid;
+      }
+
+      .print-note h1 {
+        font-size: 2em;
+        line-height: 1.15;
+        margin: 0 0 1.35em;
+        letter-spacing: -0.015em;
+        text-align: center;
+      }
+
+      .print-note h2 {
+        font-size: 1.55em;
+        line-height: 1.2;
+        margin: 1.25em 0 0.45em;
+      }
+
+      .print-note h3 {
+        font-size: 1.25em;
+        line-height: 1.3;
+        margin: 1.1em 0 0.4em;
+      }
+
+      .print-note p {
+        margin: 0 0 0.9em;
+      }
+
+      .print-note ul,
+      .print-note ol {
+        margin: 0.75em 0 1em;
+        padding-left: 1.7em;
+        list-style-position: outside;
+      }
+
+      .print-note ul {
+        list-style-type: disc;
+      }
+
+      .print-note ol {
+        list-style-type: decimal;
+      }
+
+      .print-note li {
+        margin: 0.28em 0;
+        padding-left: 0.18em;
+      }
+
+      .print-note li > p {
+        margin: 0;
+      }
+
+      .print-note li::marker {
+        color: #334155;
+      }
+
+      .print-note blockquote {
+        margin: 1.15em 0;
+        padding-left: 1em;
+        border-left: 3px solid #cbd5e1;
+        color: #475569;
+        font-style: italic;
+      }
+
+      .print-note blockquote > :first-child {
+        margin-top: 0;
+      }
+
+      .print-note blockquote > :last-child {
+        margin-bottom: 0;
+      }
+
+      .print-note pre {
+        margin: 1.15em 0 1.3em;
+        padding: 0.95em 1.05em;
+        overflow-x: auto;
+        border: 1px solid #dbe4f0;
+        border-radius: 12px;
+        background: #f5f7fb;
+        color: #0f172a;
+        page-break-inside: avoid;
+      }
+
+      .print-note pre code {
+        background: transparent;
+        border: 0;
+        padding: 0;
+        border-radius: 0;
+        font-size: 0.92em;
+        color: inherit;
+      }
+
+      .print-note code {
+        font-family: "SFMono-Regular", "SF Mono", "JetBrains Mono", "Fira Code", "Source Code Pro", Menlo, Consolas, monospace;
+        font-size: 0.92em;
+        padding: 0.08em 0.38em;
+        border: 1px solid #dbe4f0;
+        border-radius: 0.42em;
+        background: #f5f7fb;
+        color: #0f172a;
+      }
+
+      .print-note a {
+        color: #2563eb;
+        text-decoration: underline;
+        text-decoration-thickness: 0.08em;
+        text-underline-offset: 0.14em;
+      }
+
+      .print-note strong {
+        font-weight: 700;
+      }
+
+      .print-note em {
+        font-style: italic;
+      }
+
+      .print-note del {
+        text-decoration: line-through;
+      }
+
+      .print-note hr {
+        border: 0;
+        border-top: 1px solid #cbd5e1;
+        margin: 1.6em 0;
+      }
+
+      .print-note img {
+        display: block;
+        max-width: 100%;
+        height: auto;
+        margin: 1.2em auto;
+        border-radius: 12px;
+        page-break-inside: avoid;
+      }
+
+      .print-note table {
+        width: 100%;
+        border-collapse: collapse;
+        margin: 1em 0 1.2em;
+        font-size: 0.95em;
+      }
+
+      .print-note th,
+      .print-note td {
+        border: 1px solid #dbe4f0;
+        padding: 0.5em 0.65em;
+        text-align: left;
+        vertical-align: top;
+      }
+
+      .print-note th {
+        background: #f8fafc;
+        font-weight: 600;
+      }
+    </style>
+  </head>
+  <body>
+    <article class="print-note">${payload.html}</article>
+  </body>
+</html>`;
+};

src/services/desktop.ts

@@ -0,0 +1,139 @@
+import {
+  buildPrintDocument,
+  PrintExportPayload,
+  PRINT_EXPORT_QUERY_PARAM,
+} from '../printExport';
+
+export interface DesktopMessageOptions {
+  title?: string;
+  kind?: 'info' | 'warning' | 'error';
+}
+
+interface ExportPdfResult {
+  canceled: boolean;
+  filePath?: string;
+}
+
+const isElectronRuntime = () =>
+  typeof window !== 'undefined' && typeof window.electronDesktop !== 'undefined';
+
+const isTauriRuntime = () =>
+  typeof window !== 'undefined' &&
+  (
+    typeof (window as Window & { __TAURI__?: unknown }).__TAURI__ !== 'undefined' ||
+    typeof (window as Window & { __TAURI_INTERNALS__?: unknown }).__TAURI_INTERNALS__ !== 'undefined'
+  );
+
+export const getDesktopRuntime = () => {
+  if (isElectronRuntime()) return 'electron';
+  if (isTauriRuntime()) return 'tauri';
+  return 'browser';
+};
+
+export const showDesktopMessage = async (
+  messageText: string,
+  options: DesktopMessageOptions = {}
+) => {
+  if (window.electronDesktop) {
+    await window.electronDesktop.showMessage({
+      message: messageText,
+      ...options,
+    });
+    return;
+  }
+
+  if (isTauriRuntime()) {
+    const { message } = await import('@tauri-apps/plugin-dialog');
+    await message(messageText, options);
+    return;
+  }
+
+  window.alert(messageText);
+};
+
+export const exportPdfDocument = async (
+  payload: PrintExportPayload
+): Promise<ExportPdfResult> => {
+  if (window.electronDesktop) {
+    return window.electronDesktop.exportPdf({
+      ...payload,
+      documentHtml: buildPrintDocument(payload),
+    });
+  }
+
+  if (isTauriRuntime()) {
+    await exportPdfDocumentWithTauri(payload);
+    return { canceled: false };
+  }
+
+  throw new Error('PDF export is only available in a desktop runtime.');
+};
+
+async function exportPdfDocumentWithTauri(payload: PrintExportPayload) {
+  const [{ emitTo, listen }, { WebviewWindow }] = await Promise.all([
+    import('@tauri-apps/api/event'),
+    import('@tauri-apps/api/webviewWindow'),
+  ]);
+
+  const jobId = `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
+  const windowLabel = `print-export-${jobId}`;
+  let printWindow: any = null;
+  let unlistenReady: any = null;
+
+  try {
+    await new Promise<void>((resolve, reject) => {
+      let settled = false;
+      const timeoutId = window.setTimeout(() => {
+        if (settled) return;
+        settled = true;
+        unlistenReady?.();
+        reject(new Error('Print view initialization timed out.'));
+      }, 10000);
+
+      listen<{ jobId: string }>('print-export-ready', (event) => {
+        if (settled || event.payload.jobId !== jobId) return;
+
+        settled = true;
+        window.clearTimeout(timeoutId);
+        unlistenReady?.();
+
+        void emitTo(windowLabel, 'print-export-payload', payload)
+          .then(() => resolve())
+          .catch(reject);
+      })
+        .then((unlisten) => {
+          unlistenReady = unlisten;
+          printWindow = new WebviewWindow(windowLabel, {
+            url: `/?${PRINT_EXPORT_QUERY_PARAM}=${encodeURIComponent(jobId)}`,
+            title: 'Opening Print Dialog',
+            width: 960,
+            height: 1100,
+            center: true,
+            visible: true,
+            focus: true,
+            skipTaskbar: true,
+            resizable: false,
+            parent: 'main',
+          });
+
+          void printWindow.once('tauri://error', (event: { payload?: unknown }) => {
+            if (settled) return;
+            settled = true;
+            window.clearTimeout(timeoutId);
+            unlistenReady?.();
+            reject(new Error(String(event.payload ?? 'Failed to create print window.')));
+          });
+        })
+        .catch(reject);
+    });
+  } catch (error) {
+    if (printWindow) {
+      void printWindow.close().catch(() => undefined);
+    }
+    throw error;
+  } finally {
+    if (typeof unlistenReady === 'function') {
+      unlistenReady();
+    }
+  }
+}

src/services/runtimeFetch.ts

@@ -0,0 +1,155 @@
+interface ElectronHttpRequest {
+  url: string;
+  method?: string;
+  headers?: Record<string, string>;
+  bodyText?: string;
+  bodyBase64?: string;
+}
+
+interface ElectronHttpResponse {
+  ok: boolean;
+  status: number;
+  statusText: string;
+  headers: Record<string, string>;
+  bodyBase64: string;
+}
+
+interface RuntimeResponse {
+  ok: boolean;
+  status: number;
+  statusText: string;
+  headers: {
+    get(name: string): string | null;
+  };
+  text(): Promise<string>;
+  json<T>(): Promise<T>;
+  arrayBuffer(): Promise<ArrayBuffer>;
+  blob(): Promise<Blob>;
+}
+
+const textDecoder = new TextDecoder();
+
+const bytesToBase64 = (bytes: Uint8Array) => {
+  let binary = '';
+
+  for (let index = 0; index < bytes.length; index += 0x8000) {
+    const chunk = bytes.subarray(index, index + 0x8000);
+    binary += String.fromCharCode(...chunk);
+  }
+
+  return btoa(binary);
+};
+
+const base64ToBytes = (value: string) => {
+  if (!value) {
+    return new Uint8Array(0);
+  }
+
+  const binary = atob(value);
+  const bytes = new Uint8Array(binary.length);
+
+  for (let index = 0; index < binary.length; index += 1) {
+    bytes[index] = binary.charCodeAt(index);
+  }
+
+  return bytes;
+};
+
+const normalizeHeaders = (headers: Record<string, string>) => {
+  const normalized = new Map<string, string>();
+
+  for (const [key, value] of Object.entries(headers)) {
+    normalized.set(key.toLowerCase(), value);
+  }
+
+  return normalized;
+};
+
+const createRuntimeResponse = (response: ElectronHttpResponse): RuntimeResponse => {
+  const headers = normalizeHeaders(response.headers);
+  const bytes = base64ToBytes(response.bodyBase64);
+  const contentType = headers.get('content-type') || '';
+
+  return {
+    ok: response.ok,
+    status: response.status,
+    statusText: response.statusText,
+    headers: {
+      get(name: string) {
+        return headers.get(name.toLowerCase()) ?? null;
+      },
+    },
+    async text() {
+      return textDecoder.decode(bytes);
+    },
+    async json<T>() {
+      return JSON.parse(textDecoder.decode(bytes)) as T;
+    },
+    async arrayBuffer() {
+      return bytes.buffer.slice(
+        bytes.byteOffset,
+        bytes.byteOffset + bytes.byteLength,
+      ) as ArrayBuffer;
+    },
+    async blob() {
+      return new Blob([bytes], { type: contentType });
+    },
+  };
+};
+
+const headersToObject = (headers?: HeadersInit) => {
+  if (!headers) {
+    return {};
+  }
+
+  return Object.fromEntries(new Headers(headers).entries());
+};
+
+const serializeBody = async (body?: BodyInit | null) => {
+  if (body == null) {
+    return {};
+  }
+
+  if (typeof body === 'string') {
+    return { bodyText: body };
+  }
+
+  if (body instanceof ArrayBuffer) {
+    return { bodyBase64: bytesToBase64(new Uint8Array(body)) };
+  }
+
+  if (ArrayBuffer.isView(body)) {
+    return {
+      bodyBase64: bytesToBase64(
+        new Uint8Array(body.buffer, body.byteOffset, body.byteLength),
+      ),
+    };
+  }
+
+  if (body instanceof Blob) {
+    return {
+      bodyBase64: bytesToBase64(new Uint8Array(await body.arrayBuffer())),
+    };
+  }
+
+  throw new Error('Unsupported request body for Electron runtime.');
+};
+
+export const runtimeFetch = async (
+  url: string,
+  init: RequestInit = {},
+): Promise<Response | RuntimeResponse> => {
+  if (!window.electronDesktop?.httpRequest) {
+    return fetch(url, init);
+  }
+
+  const payload: ElectronHttpRequest = {
+    url,
+    method: init.method,
+    headers: headersToObject(init.headers),
+    ...(await serializeBody(init.body)),
+  };
+
+  const response = await window.electronDesktop.httpRequest(payload);
+  return createRuntimeResponse(response);
+};

src/vite-env.d.ts

@@ -1 +1,46 @@
 /// <reference types="vite/client" />
+
+interface ElectronDesktopMessageOptions {
+  message: string;
+  title?: string;
+  kind?: 'info' | 'warning' | 'error';
+}
+
+interface ElectronDesktopExportPayload {
+  fileName: string;
+  title: string;
+  html: string;
+  previewFont: string;
+  previewFontSize: number;
+  documentHtml: string;
+}
+
+interface ElectronDesktopExportResult {
+  canceled: boolean;
+  filePath?: string;
+}
+
+interface ElectronDesktopHttpRequest {
+  url: string;
+  method?: string;
+  headers?: Record<string, string>;
+  bodyText?: string;
+  bodyBase64?: string;
+}
+
+interface ElectronDesktopHttpResponse {
+  ok: boolean;
+  status: number;
+  statusText: string;
+  headers: Record<string, string>;
+  bodyBase64: string;
+}
+
+interface Window {
+  electronDesktop?: {
+    showMessage: (options: ElectronDesktopMessageOptions) => Promise<void>;
+    exportPdf: (payload: ElectronDesktopExportPayload) => Promise<ElectronDesktopExportResult>;
+    httpRequest: (payload: ElectronDesktopHttpRequest) => Promise<ElectronDesktopHttpResponse>;
+    getRuntime: () => 'electron';
+  };
+}

vite.config.ts

@@ -17,6 +17,10 @@ export default defineConfig(async () => ({
     port: 1420,
     strictPort: true,
     host: host || false,
+    headers: {
+      "Content-Security-Policy":
+        "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: https: http:; font-src 'self' data:; connect-src 'self' https: http: ws: wss:; object-src 'none'; base-uri 'self'; frame-ancestors 'none'",
+    },
     hmr: host
       ? {
           protocol: "ws",