fix: resolve did-finish-load race condition, remove unused import

- Move did-finish-load listener before loadFile() to prevent missing the event
- Remove unused nativeImage import

main.js

@@ -1,4 +1,4 @@
-const { app, BrowserWindow, dialog, ipcMain, Menu, nativeImage } = require('electron');
+const { app, BrowserWindow, dialog, ipcMain, Menu } = require('electron');
 const path = require('path');
 const fs = require('fs');
 
@@ -23,6 +23,14 @@ function createWindow() {
     show: false
   });
 
+  // Register did-finish-load BEFORE loadFile to avoid race condition
+  mainWindow.webContents.on('did-finish-load', () => {
+    if (pendingFilePath) {
+      openFile(pendingFilePath);
+      pendingFilePath = null;
+    }
+  });
+
   // Load the index.html
   mainWindow.loadFile(path.join(__dirname, 'renderer', 'index.html'));
 
@@ -261,16 +269,7 @@ app.whenReady().then(() => {
   if (fileToOpen) {
     pendingFilePath = fileToOpen;
   }
-
-  // Open pending file once window is fully ready
-  if (pendingFilePath) {
-    mainWindow.webContents.on('did-finish-load', () => {
-      if (pendingFilePath) {
-        openFile(pendingFilePath);
-        pendingFilePath = null;
-      }
-    });
-  }
+  // pendingFilePath will be opened by the did-finish-load handler in createWindow()
 });
 
 app.on('window-all-closed', () => {