fix(ci): center-crop non-square logos before tauri icon generation

tauri icon requires a square source image. Uploaded logos like 727x721
caused Prepare template to fail. Use sharp to center-crop to square
before generating platform icons.

Co-authored-by: ShuMengya <shumengya666@outlook.com>

package.json

@@ -18,6 +18,7 @@
   "devDependencies": {
     "adm-zip": "^0.5.17",
     "concurrently": "^9.1.2",
+    "sharp": "^0.34.2",
     "typescript": "~5.6.2",
     "wrangler": "^3.99.0"
   }