style: Add semicolons and improve code formatting

- Add missing semicolons to all statements in prebuild.js
- Adjust indentation and spacing for consistency
- Remove trailing whitespace at end of file

Author: yangbobo2021

prebuild.js

@@ -1,26 +1,26 @@
-require('dotenv').config()
+require('dotenv').config();
 
-const fs = require('fs')
-const path = require('path')
+const fs = require('fs');
+const path = require('path');
 
 function copyIcon(src, dst) {
     if (!src) {
-        console.warn(`Icon path for ${dst} is not defined in your environment variables`)
-        return
+        console.warn(`Icon path for ${dst} is not defined in your environment variables`);
+        return;
     }
-    console.log(`Replacing icon ${dst} by ${src}`)
+    console.log(`Replacing icon ${dst} by ${src}`);
     if (!fs.existsSync(src)) {
-        console.warn(`Icon file ${src} does not exist.`)
-        return
+        console.warn(`Icon file ${src} does not exist.`);
+        return;
     }
 
-    const destPath = path.join(__dirname, 'assets', dst)
+    const destPath = path.join(__dirname, 'assets', dst);
 
     try {
-        fs.copyFileSync(src, destPath)
-        fs.chmodSync(destPath, 0o644)
+        fs.copyFileSync(src, destPath);
+        fs.chmodSync(destPath, 0o644);
     } catch(e) {
-        console.warn(`Failed to copy logo ${e}`)
+        console.warn(`Failed to copy logo ${e}`);
     }
 }
 
@@ -31,7 +31,7 @@ function updatePackageJson() {
         ASSISTANT_NAME_EN: process.env.ASSISTANT_NAME_EN || "DevChat",
         ASSISTANT_NAME_ZH: process.env.ASSISTANT_NAME_ZH || "DevChat"
     }
-    console.log(`Updating package.json, env: ${JSON.stringify(placeholders)}`)
+    console.log(`Updating package.json, env: ${JSON.stringify(placeholders)}`);
 
     let packageJson = fs.readFileSync('package.json', 'utf8');
 
@@ -44,8 +44,8 @@ function updatePackageJson() {
     fs.writeFileSync('package.json', packageJson);
 }
 
-copyIcon(process.env.EXTENSION_ICON, 'devchat.png')
-copyIcon(process.env.SIDEBAR_ICON, 'devchat_icon.svg')
-copyIcon(process.env.DIFF_APPLY_ICON, 'devchat_apply.svg')
+copyIcon(process.env.EXTENSION_ICON, 'devchat.png');
+copyIcon(process.env.SIDEBAR_ICON, 'devchat_icon.svg');
+copyIcon(process.env.DIFF_APPLY_ICON, 'devchat_apply.svg');
 
-updatePackageJson()
+updatePackageJson();