Use transparent v3 logo for extension and popup icons

Regenerate icon-{16,32,48,128}.png from the new transparent
OpenScript_v3.png master so the toolbar button and popup header
no longer show a white square on dark backgrounds.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

public/icons/README.md

@@ -2,4 +2,5 @@
 
 - `OpenScript_v1.png`: Original monochrome terminal prompt (`> _`) concept.
 - `OpenScript_v2.png`: Ocean wave terminal monogram (`>_ O`) master logo introduced for Chrome Web Store release.
-- `icon-{16,32,48,128}.png`: Production extension icons generated from v2 master via `npm run build:icons`.
+- `OpenScript_v3.png`: Transparent-background version of the v2 logo; current master for extension icons.
+- `icon-{16,32,48,128}.png`: Production extension icons generated from v3 master via `npm run build:icons`.

scripts/build-zip.js

@@ -10,6 +10,7 @@ execFileSync(process.execPath, ['node_modules/vite/bin/vite.js', 'build'], { std
 [
   'dist/icons/OpenScript_v1.png',
   'dist/icons/OpenScript_v2.png',
+  'dist/icons/OpenScript_v3.png',
   'dist/icons/logo.png',
   'dist/screenshot1.png',
   'dist/scripts.png',

scripts/generate-icons.js

@@ -1,12 +1,12 @@
 import sharp from 'sharp';
 import fs from 'fs';
 
-const src = 'public/icons/OpenScript_v2.png';
+const src = 'public/icons/OpenScript_v3.png';
 const sizes = [16, 32, 48, 128];
 
 for (const s of sizes) {
   await sharp(src)
-    .resize(s, s, { fit: 'contain' })
+    .resize(s, s, { fit: 'contain', background: { r: 0, g: 0, b: 0, alpha: 0 } })
     .png()
     .toFile(`public/icons/icon-${s}.png`);
   console.log(`✓ Generated icon-${s}.png`);