fix(baoyu-slide-deck): add pptxgenjs dependency and detect image format by magic bytes

package.json

@@ -17,6 +17,7 @@
     "tsx": "^4.20.5"
   },
   "dependencies": {
-    "pdf-lib": "^1.17.1"
+    "pdf-lib": "^1.17.1",
+    "pptxgenjs": "^4.0.1"
   }
 }

skills/baoyu-slide-deck/scripts/merge-to-pdf.ts

@@ -73,8 +73,8 @@ async function createPdf(slides: SlideInfo[], outputPath: string) {
 
   for (const slide of slides) {
     const imageData = readFileSync(slide.path);
-    const ext = slide.filename.toLowerCase();
-    const image = ext.endsWith(".png")
+    const isPng = imageData[0] === 0x89 && imageData[1] === 0x50 && imageData[2] === 0x4e && imageData[3] === 0x47;
+    const image = isPng
       ? await pdfDoc.embedPng(imageData)
       : await pdfDoc.embedJpg(imageData);