Major v1.2.0 editor enhancements

- Add comprehensive Find & Replace with match highlighting
- Add toggleable line numbers with theme support
- Implement full undo/redo functionality with keyboard shortcuts
- Add smart auto-indentation for lists and code blocks
- Enhanced keyboard shortcuts for productivity
- Advanced tab handling for indentation/outdentation
- Updated About dialog with v1.2.0 and complete feature list
- Add Find & Replace to Edit menu
- Updated README.md with comprehensive feature documentation
🤖 Generated with [Claude Code](https://claude.ai/code)

src/main.js

@@ -107,12 +107,18 @@ function createMenu() {
       label: 'Edit',
       submenu: [
         { label: 'Undo', accelerator: 'CmdOrCtrl+Z', role: 'undo' },
-        { label: 'Redo', accelerator: 'CmdOrCtrl+Y', role: 'redo' },
+        { label: 'Redo', accelerator: 'CmdOrCtrl+Shift+Z', role: 'redo' },
         { type: 'separator' },
         { label: 'Cut', accelerator: 'CmdOrCtrl+X', role: 'cut' },
         { label: 'Copy', accelerator: 'CmdOrCtrl+C', role: 'copy' },
         { label: 'Paste', accelerator: 'CmdOrCtrl+V', role: 'paste' },
-        { label: 'Select All', accelerator: 'CmdOrCtrl+A', role: 'selectAll' }
+        { label: 'Select All', accelerator: 'CmdOrCtrl+A', role: 'selectAll' },
+        { type: 'separator' },
+        { 
+          label: 'Find & Replace', 
+          accelerator: 'CmdOrCtrl+F', 
+          click: () => mainWindow.webContents.send('toggle-find') 
+        }
       ]
     },
     {
@@ -178,7 +184,7 @@ function createMenu() {
               type: 'info',
               title: 'About PanConverter',
               message: 'PanConverter',
-              detail: 'A cross-platform Markdown editor and converter using Pandoc.\n\nVersion: 1.1.0\nAuthor: Amit Haridas\nEmail: amit.wh@gmail.com\nLicense: MIT\n\nFeatures:\n• Markdown editing with live preview\n• Export to multiple formats via Pandoc\n• Export tables to Excel/ODS spreadsheets\n• Multiple themes support',
+              detail: 'A cross-platform Markdown editor and converter using Pandoc.\n\nVersion: 1.2.0\nAuthor: Amit Haridas\nEmail: amit.wh@gmail.com\nLicense: MIT\n\nFeatures:\n• Advanced markdown editing with live preview\n• Find & replace with match highlighting\n• Line numbers and auto-indentation\n• Export to multiple formats via Pandoc\n• PowerPoint & presentation export\n• Export tables to Excel/ODS spreadsheets\n• Document import & conversion\n• Table creation helper\n• Multiple themes support\n• Undo/redo functionality',
               buttons: ['OK']
             });
           }