feat: Add persistence for loaded file, scroll position, speed, and font size.

src/main.ts

@@ -62,3 +62,25 @@ ipcMain.handle('read-file', async (event, filePath: string) => {
         throw err;
     }
 });
+
+const configPath = path.join(app.getPath('userData'), 'config.json');
+
+ipcMain.handle('load-settings', async () => {
+    try {
+        if (fs.existsSync(configPath)) {
+            const data = fs.readFileSync(configPath, 'utf-8');
+            return JSON.parse(data);
+        }
+    } catch (error) {
+        console.error('Failed to load settings:', error);
+    }
+    return {};
+});
+
+ipcMain.handle('save-settings', async (event, settings) => {
+    try {
+        fs.writeFileSync(configPath, JSON.stringify(settings, null, 2));
+    } catch (error) {
+        console.error('Failed to save settings:', error);
+    }
+});